CVE-2021-1368

mediumpriority · track · 35EPSS 0.005 · 39 %ileEURUUS
grimoire priorityP3 · Track
Exploitable?
—
no known exploitation
Likely / severe?
0.46% (39th) EPSS
CVSS 4.9 · medium
Is it mine?
187 products
Check your exposure
Who says so?
4 sources
cnnvd · enisa_euvd · fstec_bdu · cisco_csaf

EPSS · scored 2026-10-27

A vulnerability in the Unidirectional Link Detection (UDLD) feature of Cisco FXOS Software and Cisco NX-OS Software could allow an unauthenticated, adjacent attacker to execute arbitrary code with administrative privileges or cause a denial of service (DoS) condition on an affected device. This vulnerability is due to insufficient input validation. An attacker could exploit this vulnerability by sending crafted Cisco UDLD protocol packets to a directly connected, affected device. A successful exploit could allow the attacker to execute arbitrary code with administrative privileges or cause the Cisco UDLD process to crash and restart multiple times, causing the affected device to reload and resulting in a DoS condition. Note: The UDLD feature is disabled by default, and the conditions to exploit this vulnerability are strict. The attacker needs full control of a directly connected device. That device must be connected over a port channel that has UDLD enabled. To trigger arbitrary code execution, both the UDLD-enabled port channel and specific system conditions must exist. In the absence of either the UDLD-enabled port channel or the system conditions, attempts to exploit this vulnerability will result in a DoS condition. It is possible, but highly unlikely, that an attacker could control the necessary conditions for exploitation. The CVSS score reflects this possibility. However, given the complexity of exploitation, Cisco has assigned a Medium Security Impact Rating (SIR) to this vulnerability.

01

remediations

Vendor fix, mitigation, or workaround guidance, as published by each source.

A vendor fix is available.

  • FixedCisco Firepower Extensible Operating System (FXOS)cisco_csaf

    Cisco has released software updates that address this vulnerability.

    https://software.cisco.com
  • FixedCisco NX-OS Software 6.0(2)A8(1) when installed on Cisco Nexus 3000 Series Switchescisco_csaf

    Cisco has released software updates that address this vulnerability.

    https://software.cisco.com
  • FixedCisco NX-OS Software 6.0(2)A8(10) when installed on Cisco Nexus 3000 Series Switchescisco_csaf

    Cisco has released software updates that address this vulnerability.

    https://software.cisco.com
  • FixedCisco NX-OS Software 6.0(2)A8(10a) when installed on Cisco Nexus 3000 Series Switchescisco_csaf

    Cisco has released software updates that address this vulnerability.

    https://software.cisco.com
  • FixedCisco NX-OS Software 6.0(2)A8(11) when installed on Cisco Nexus 3000 Series Switchescisco_csaf

    Cisco has released software updates that address this vulnerability.

    https://software.cisco.com
  • FixedCisco NX-OS Software 6.0(2)A8(11a) when installed on Cisco Nexus 3000 Series Switchescisco_csaf

    Cisco has released software updates that address this vulnerability.

    https://software.cisco.com
  • FixedCisco NX-OS Software 6.0(2)A8(11b) when installed on Cisco Nexus 3000 Series Switchescisco_csaf

    Cisco has released software updates that address this vulnerability.

    https://software.cisco.com
  • FixedCisco NX-OS Software 6.0(2)A8(2) when installed on Cisco Nexus 3000 Series Switchescisco_csaf

    Cisco has released software updates that address this vulnerability.

    https://software.cisco.com
  • FixedCisco NX-OS Software 6.0(2)A8(3) when installed on Cisco Nexus 3000 Series Switchescisco_csaf

    Cisco has released software updates that address this vulnerability.

    https://software.cisco.com
  • FixedCisco NX-OS Software 6.0(2)A8(4) when installed on Cisco Nexus 3000 Series Switchescisco_csaf

    Cisco has released software updates that address this vulnerability.

    https://software.cisco.com
  • FixedCisco NX-OS Software 6.0(2)A8(4a) when installed on Cisco Nexus 3000 Series Switchescisco_csaf

    Cisco has released software updates that address this vulnerability.

    https://software.cisco.com
  • FixedCisco NX-OS Software 6.0(2)A8(5) when installed on Cisco Nexus 3000 Series Switchescisco_csaf

    Cisco has released software updates that address this vulnerability.

    https://software.cisco.com
  • FixedCisco NX-OS Software 6.0(2)A8(6) when installed on Cisco Nexus 3000 Series Switchescisco_csaf

    Cisco has released software updates that address this vulnerability.

    https://software.cisco.com
  • FixedCisco NX-OS Software 6.0(2)A8(7) when installed on Cisco Nexus 3000 Series Switchescisco_csaf

    Cisco has released software updates that address this vulnerability.

    https://software.cisco.com
  • FixedCisco NX-OS Software 6.0(2)A8(7a) when installed on Cisco Nexus 3000 Series Switchescisco_csaf

    Cisco has released software updates that address this vulnerability.

    https://software.cisco.com
  • FixedCisco NX-OS Software 6.0(2)A8(7b) when installed on Cisco Nexus 3000 Series Switchescisco_csaf

    Cisco has released software updates that address this vulnerability.

    https://software.cisco.com
  • FixedCisco NX-OS Software 6.0(2)A8(8) when installed on Cisco Nexus 3000 Series Switchescisco_csaf

    Cisco has released software updates that address this vulnerability.

    https://software.cisco.com
  • FixedCisco NX-OS Software 6.0(2)A8(9) when installed on Cisco Nexus 3000 Series Switchescisco_csaf

    Cisco has released software updates that address this vulnerability.

    https://software.cisco.com
  • FixedCisco NX-OS Software 7.0(3)F3(1) when installed on Cisco Nexus 3000 Series Switchescisco_csaf

    Cisco has released software updates that address this vulnerability.

    https://software.cisco.com
  • FixedCisco NX-OS Software 7.0(3)F3(1) when installed on Cisco Nexus 9000 Series Switchescisco_csaf

    Cisco has released software updates that address this vulnerability.

    https://software.cisco.com
  • FixedCisco NX-OS Software 7.0(3)F3(2) when installed on Cisco Nexus 3000 Series Switchescisco_csaf

    Cisco has released software updates that address this vulnerability.

    https://software.cisco.com
  • FixedCisco NX-OS Software 7.0(3)F3(3) when installed on Cisco Nexus 3000 Series Switchescisco_csaf

    Cisco has released software updates that address this vulnerability.

    https://software.cisco.com
  • FixedCisco NX-OS Software 7.0(3)F3(3) when installed on Cisco Nexus 9000 Series Switchescisco_csaf

    Cisco has released software updates that address this vulnerability.

    https://software.cisco.com
  • FixedCisco NX-OS Software 7.0(3)F3(3a) when installed on Cisco Nexus 3000 Series Switchescisco_csaf

    Cisco has released software updates that address this vulnerability.

    https://software.cisco.com
  • FixedCisco NX-OS Software 7.0(3)F3(3a) when installed on Cisco Nexus 9000 Series Switchescisco_csaf

    Cisco has released software updates that address this vulnerability.

    https://software.cisco.com
  • FixedCisco NX-OS Software 7.0(3)F3(3c) when installed on Cisco Nexus 3000 Series Switchescisco_csaf

    Cisco has released software updates that address this vulnerability.

    https://software.cisco.com
  • FixedCisco NX-OS Software 7.0(3)F3(3c) when installed on Cisco Nexus 9000 Series Switchescisco_csaf

    Cisco has released software updates that address this vulnerability.

    https://software.cisco.com
  • FixedCisco NX-OS Software 7.0(3)F3(4) when installed on Cisco Nexus 3000 Series Switchescisco_csaf

    Cisco has released software updates that address this vulnerability.

    https://software.cisco.com
  • FixedCisco NX-OS Software 7.0(3)F3(4) when installed on Cisco Nexus 9000 Series Switchescisco_csaf

    Cisco has released software updates that address this vulnerability.

    https://software.cisco.com
  • FixedCisco NX-OS Software 7.0(3)F3(5) when installed on Cisco Nexus 3000 Series Switchescisco_csaf

    Cisco has released software updates that address this vulnerability.

    https://software.cisco.com
  • FixedCisco NX-OS Software 7.0(3)F3(5) when installed on Cisco Nexus 9000 Series Switchescisco_csaf

    Cisco has released software updates that address this vulnerability.

    https://software.cisco.com
  • FixedCisco NX-OS Software 7.0(3)I4(1) when installed on Cisco Nexus 3000 Series Switchescisco_csaf

    Cisco has released software updates that address this vulnerability.

    https://software.cisco.com
  • FixedCisco NX-OS Software 7.0(3)I4(1) when installed on Cisco Nexus 9000 Series Switchescisco_csaf

    Cisco has released software updates that address this vulnerability.

    https://software.cisco.com
  • FixedCisco NX-OS Software 7.0(3)I4(1t) when installed on Cisco Nexus 3000 Series Switchescisco_csaf

    Cisco has released software updates that address this vulnerability.

    https://software.cisco.com
  • FixedCisco NX-OS Software 7.0(3)I4(1t) when installed on Cisco Nexus 9000 Series Switchescisco_csaf

    Cisco has released software updates that address this vulnerability.

    https://software.cisco.com
  • FixedCisco NX-OS Software 7.0(3)I4(2) when installed on Cisco Nexus 3000 Series Switchescisco_csaf

    Cisco has released software updates that address this vulnerability.

    https://software.cisco.com
  • FixedCisco NX-OS Software 7.0(3)I4(2) when installed on Cisco Nexus 9000 Series Switchescisco_csaf

    Cisco has released software updates that address this vulnerability.

    https://software.cisco.com
  • FixedCisco NX-OS Software 7.0(3)I4(3) when installed on Cisco Nexus 3000 Series Switchescisco_csaf

    Cisco has released software updates that address this vulnerability.

    https://software.cisco.com
  • FixedCisco NX-OS Software 7.0(3)I4(3) when installed on Cisco Nexus 9000 Series Switchescisco_csaf

    Cisco has released software updates that address this vulnerability.

    https://software.cisco.com
  • FixedCisco NX-OS Software 7.0(3)I4(4) when installed on Cisco Nexus 3000 Series Switchescisco_csaf

    Cisco has released software updates that address this vulnerability.

    https://software.cisco.com
  • FixedCisco NX-OS Software 7.0(3)I4(4) when installed on Cisco Nexus 9000 Series Switchescisco_csaf

    Cisco has released software updates that address this vulnerability.

    https://software.cisco.com
  • FixedCisco NX-OS Software 7.0(3)I4(5) when installed on Cisco Nexus 3000 Series Switchescisco_csaf

    Cisco has released software updates that address this vulnerability.

    https://software.cisco.com
  • FixedCisco NX-OS Software 7.0(3)I4(5) when installed on Cisco Nexus 9000 Series Switchescisco_csaf

    Cisco has released software updates that address this vulnerability.

    https://software.cisco.com
  • FixedCisco NX-OS Software 7.0(3)I4(6) when installed on Cisco Nexus 3000 Series Switchescisco_csaf

    Cisco has released software updates that address this vulnerability.

    https://software.cisco.com
  • FixedCisco NX-OS Software 7.0(3)I4(6) when installed on Cisco Nexus 9000 Series Switchescisco_csaf

    Cisco has released software updates that address this vulnerability.

    https://software.cisco.com
  • FixedCisco NX-OS Software 7.0(3)I4(6t) when installed on Cisco Nexus 3000 Series Switchescisco_csaf

    Cisco has released software updates that address this vulnerability.

    https://software.cisco.com
  • FixedCisco NX-OS Software 7.0(3)I4(6t) when installed on Cisco Nexus 9000 Series Switchescisco_csaf

    Cisco has released software updates that address this vulnerability.

    https://software.cisco.com
  • FixedCisco NX-OS Software 7.0(3)I4(7) when installed on Cisco Nexus 3000 Series Switchescisco_csaf

    Cisco has released software updates that address this vulnerability.

    https://software.cisco.com
  • FixedCisco NX-OS Software 7.0(3)I4(7) when installed on Cisco Nexus 9000 Series Switchescisco_csaf

    Cisco has released software updates that address this vulnerability.

    https://software.cisco.com
  • FixedCisco NX-OS Software 7.0(3)I4(8) when installed on Cisco Nexus 3000 Series Switchescisco_csaf

    Cisco has released software updates that address this vulnerability.

    https://software.cisco.com
  • FixedCisco NX-OS Software 7.0(3)I4(8) when installed on Cisco Nexus 9000 Series Switchescisco_csaf

    Cisco has released software updates that address this vulnerability.

    https://software.cisco.com
  • FixedCisco NX-OS Software 7.0(3)I4(8a) when installed on Cisco Nexus 3000 Series Switchescisco_csaf

    Cisco has released software updates that address this vulnerability.

    https://software.cisco.com
  • FixedCisco NX-OS Software 7.0(3)I4(8a) when installed on Cisco Nexus 9000 Series Switchescisco_csaf

    Cisco has released software updates that address this vulnerability.

    https://software.cisco.com
  • FixedCisco NX-OS Software 7.0(3)I4(8b) when installed on Cisco Nexus 3000 Series Switchescisco_csaf

    Cisco has released software updates that address this vulnerability.

    https://software.cisco.com
  • FixedCisco NX-OS Software 7.0(3)I4(8b) when installed on Cisco Nexus 9000 Series Switchescisco_csaf

    Cisco has released software updates that address this vulnerability.

    https://software.cisco.com
  • FixedCisco NX-OS Software 7.0(3)I4(8z) when installed on Cisco Nexus 3000 Series Switchescisco_csaf

    Cisco has released software updates that address this vulnerability.

    https://software.cisco.com
  • FixedCisco NX-OS Software 7.0(3)I4(8z) when installed on Cisco Nexus 9000 Series Switchescisco_csaf

    Cisco has released software updates that address this vulnerability.

    https://software.cisco.com
  • FixedCisco NX-OS Software 7.0(3)I4(9) when installed on Cisco Nexus 3000 Series Switchescisco_csaf

    Cisco has released software updates that address this vulnerability.

    https://software.cisco.com
  • FixedCisco NX-OS Software 7.0(3)I4(9) when installed on Cisco Nexus 9000 Series Switchescisco_csaf

    Cisco has released software updates that address this vulnerability.

    https://software.cisco.com
  • FixedCisco NX-OS Software 7.0(3)I5(1) when installed on Cisco Nexus 3000 Series Switchescisco_csaf

    Cisco has released software updates that address this vulnerability.

    https://software.cisco.com
  • FixedCisco NX-OS Software 7.0(3)I5(1) when installed on Cisco Nexus 9000 Series Switchescisco_csaf

    Cisco has released software updates that address this vulnerability.

    https://software.cisco.com
  • FixedCisco NX-OS Software 7.0(3)I5(2) when installed on Cisco Nexus 3000 Series Switchescisco_csaf

    Cisco has released software updates that address this vulnerability.

    https://software.cisco.com
  • FixedCisco NX-OS Software 7.0(3)I5(2) when installed on Cisco Nexus 9000 Series Switchescisco_csaf

    Cisco has released software updates that address this vulnerability.

    https://software.cisco.com
  • FixedCisco NX-OS Software 7.0(3)I5(3) when installed on Cisco Nexus 3000 Series Switchescisco_csaf

    Cisco has released software updates that address this vulnerability.

    https://software.cisco.com
  • FixedCisco NX-OS Software 7.0(3)I5(3) when installed on Cisco Nexus 9000 Series Switchescisco_csaf

    Cisco has released software updates that address this vulnerability.

    https://software.cisco.com
  • FixedCisco NX-OS Software 7.0(3)I5(3a) when installed on Cisco Nexus 3000 Series Switchescisco_csaf

    Cisco has released software updates that address this vulnerability.

    https://software.cisco.com
  • FixedCisco NX-OS Software 7.0(3)I5(3a) when installed on Cisco Nexus 9000 Series Switchescisco_csaf

    Cisco has released software updates that address this vulnerability.

    https://software.cisco.com
  • FixedCisco NX-OS Software 7.0(3)I5(3b) when installed on Cisco Nexus 3000 Series Switchescisco_csaf

    Cisco has released software updates that address this vulnerability.

    https://software.cisco.com
  • FixedCisco NX-OS Software 7.0(3)I5(3b) when installed on Cisco Nexus 9000 Series Switchescisco_csaf

    Cisco has released software updates that address this vulnerability.

    https://software.cisco.com
  • FixedCisco NX-OS Software 7.0(3)I6(1) when installed on Cisco Nexus 3000 Series Switchescisco_csaf

    Cisco has released software updates that address this vulnerability.

    https://software.cisco.com
  • FixedCisco NX-OS Software 7.0(3)I6(1) when installed on Cisco Nexus 9000 Series Switchescisco_csaf

    Cisco has released software updates that address this vulnerability.

    https://software.cisco.com
  • FixedCisco NX-OS Software 7.0(3)I6(2) when installed on Cisco Nexus 3000 Series Switchescisco_csaf

    Cisco has released software updates that address this vulnerability.

    https://software.cisco.com
  • FixedCisco NX-OS Software 7.0(3)I6(2) when installed on Cisco Nexus 9000 Series Switchescisco_csaf

    Cisco has released software updates that address this vulnerability.

    https://software.cisco.com
  • FixedCisco NX-OS Software 7.0(3)I7(1) when installed on Cisco Nexus 3000 Series Switchescisco_csaf

    Cisco has released software updates that address this vulnerability.

    https://software.cisco.com
  • FixedCisco NX-OS Software 7.0(3)I7(1) when installed on Cisco Nexus 9000 Series Switchescisco_csaf

    Cisco has released software updates that address this vulnerability.

    https://software.cisco.com
  • FixedCisco NX-OS Software 7.0(3)I7(2) when installed on Cisco Nexus 3000 Series Switchescisco_csaf

    Cisco has released software updates that address this vulnerability.

    https://software.cisco.com
  • FixedCisco NX-OS Software 7.0(3)I7(2) when installed on Cisco Nexus 9000 Series Switchescisco_csaf

    Cisco has released software updates that address this vulnerability.

    https://software.cisco.com
  • FixedCisco NX-OS Software 7.0(3)I7(3) when installed on Cisco Nexus 3000 Series Switchescisco_csaf

    Cisco has released software updates that address this vulnerability.

    https://software.cisco.com
  • FixedCisco NX-OS Software 7.0(3)I7(3) when installed on Cisco Nexus 9000 Series Switchescisco_csaf

    Cisco has released software updates that address this vulnerability.

    https://software.cisco.com
  • FixedCisco NX-OS Software 7.0(3)I7(3z) when installed on Cisco Nexus 3000 Series Switchescisco_csaf

    Cisco has released software updates that address this vulnerability.

    https://software.cisco.com
  • FixedCisco NX-OS Software 7.0(3)I7(3z) when installed on Cisco Nexus 9000 Series Switchescisco_csaf

    Cisco has released software updates that address this vulnerability.

    https://software.cisco.com
  • FixedCisco NX-OS Software 7.0(3)I7(4) when installed on Cisco Nexus 3000 Series Switchescisco_csaf

    Cisco has released software updates that address this vulnerability.

    https://software.cisco.com
  • FixedCisco NX-OS Software 7.0(3)I7(4) when installed on Cisco Nexus 9000 Series Switchescisco_csaf

    Cisco has released software updates that address this vulnerability.

    https://software.cisco.com
  • FixedCisco NX-OS Software 7.0(3)I7(5) when installed on Cisco Nexus 3000 Series Switchescisco_csaf

    Cisco has released software updates that address this vulnerability.

    https://software.cisco.com
  • FixedCisco NX-OS Software 7.0(3)I7(5) when installed on Cisco Nexus 9000 Series Switchescisco_csaf

    Cisco has released software updates that address this vulnerability.

    https://software.cisco.com
  • FixedCisco NX-OS Software 7.0(3)I7(5a) when installed on Cisco Nexus 3000 Series Switchescisco_csaf

    Cisco has released software updates that address this vulnerability.

    https://software.cisco.com
  • FixedCisco NX-OS Software 7.0(3)I7(5a) when installed on Cisco Nexus 9000 Series Switchescisco_csaf

    Cisco has released software updates that address this vulnerability.

    https://software.cisco.com
  • FixedCisco NX-OS Software 7.0(3)I7(6) when installed on Cisco Nexus 3000 Series Switchescisco_csaf

    Cisco has released software updates that address this vulnerability.

    https://software.cisco.com
  • FixedCisco NX-OS Software 7.0(3)I7(6) when installed on Cisco Nexus 9000 Series Switchescisco_csaf

    Cisco has released software updates that address this vulnerability.

    https://software.cisco.com
  • FixedCisco NX-OS Software 7.0(3)I7(6z) when installed on Cisco Nexus 3000 Series Switchescisco_csaf

    Cisco has released software updates that address this vulnerability.

    https://software.cisco.com
  • FixedCisco NX-OS Software 7.0(3)I7(7) when installed on Cisco Nexus 3000 Series Switchescisco_csaf

    Cisco has released software updates that address this vulnerability.

    https://software.cisco.com
  • FixedCisco NX-OS Software 7.0(3)I7(7) when installed on Cisco Nexus 9000 Series Switchescisco_csaf

    Cisco has released software updates that address this vulnerability.

    https://software.cisco.com
  • FixedCisco NX-OS Software 7.0(3)I7(8) when installed on Cisco Nexus 3000 Series Switchescisco_csaf

    Cisco has released software updates that address this vulnerability.

    https://software.cisco.com
  • FixedCisco NX-OS Software 7.0(3)I7(8) when installed on Cisco Nexus 9000 Series Switchescisco_csaf

    Cisco has released software updates that address this vulnerability.

    https://software.cisco.com
  • FixedCisco NX-OS Software 7.0(3)I7(9) when installed on Cisco Nexus 3000 Series Switchescisco_csaf

    Cisco has released software updates that address this vulnerability.

    https://software.cisco.com
  • FixedCisco NX-OS Software 7.0(3)I7(9) when installed on Cisco Nexus 9000 Series Switchescisco_csaf

    Cisco has released software updates that address this vulnerability.

    https://software.cisco.com
  • FixedCisco NX-OS Software 7.0(3)I7(9w) when installed on Cisco Nexus 3000 Series Switchescisco_csaf

    Cisco has released software updates that address this vulnerability.

    https://software.cisco.com
  • FixedCisco NX-OS Software 7.0(3)I7(9w) when installed on Cisco Nexus 9000 Series Switchescisco_csaf

    Cisco has released software updates that address this vulnerability.

    https://software.cisco.com
  • FixedCisco NX-OS Software 7.0(3)IA7(1) when installed on Cisco Nexus 9000 Series Switchescisco_csaf

    Cisco has released software updates that address this vulnerability.

    https://software.cisco.com
  • FixedCisco NX-OS Software 7.0(3)IA7(2) when installed on Cisco Nexus 9000 Series Switchescisco_csaf

    Cisco has released software updates that address this vulnerability.

    https://software.cisco.com
  • FixedCisco NX-OS Software 7.0(3)IM7(2) when installed on Cisco Nexus 3000 Series Switchescisco_csaf

    Cisco has released software updates that address this vulnerability.

    https://software.cisco.com
  • FixedCisco NX-OS Software 7.3(0)D1(1) when installed on Cisco MDS 9000 Multilayer Directors and Fabric Switchescisco_csaf

    Cisco has released software updates that address this vulnerability.

    https://software.cisco.com
  • FixedCisco NX-OS Software 7.3(0)D1(1) when installed on Cisco Nexus 7000 Series Switchescisco_csaf

    Cisco has released software updates that address this vulnerability.

    https://software.cisco.com
  • FixedCisco NX-OS Software 7.3(0)DX(1) when installed on Cisco Nexus 7000 Series Switchescisco_csaf

    Cisco has released software updates that address this vulnerability.

    https://software.cisco.com
  • FixedCisco NX-OS Software 7.3(0)DY(1) when installed on Cisco MDS 9000 Multilayer Directors and Fabric Switchescisco_csaf

    Cisco has released software updates that address this vulnerability.

    https://software.cisco.com
  • FixedCisco NX-OS Software 7.3(1)D1(1) when installed on Cisco MDS 9000 Multilayer Directors and Fabric Switchescisco_csaf

    Cisco has released software updates that address this vulnerability.

    https://software.cisco.com
  • FixedCisco NX-OS Software 7.3(1)D1(1) when installed on Cisco Nexus 7000 Series Switchescisco_csaf

    Cisco has released software updates that address this vulnerability.

    https://software.cisco.com
  • FixedCisco NX-OS Software 7.3(1)DY(1) when installed on Cisco MDS 9000 Multilayer Directors and Fabric Switchescisco_csaf

    Cisco has released software updates that address this vulnerability.

    https://software.cisco.com
  • FixedCisco NX-OS Software 7.3(2)D1(1) when installed on Cisco Nexus 7000 Series Switchescisco_csaf

    Cisco has released software updates that address this vulnerability.

    https://software.cisco.com
  • FixedCisco NX-OS Software 7.3(2)D1(1d) when installed on Cisco Nexus 7000 Series Switchescisco_csaf

    Cisco has released software updates that address this vulnerability.

    https://software.cisco.com
  • FixedCisco NX-OS Software 7.3(2)D1(2) when installed on Cisco Nexus 7000 Series Switchescisco_csaf

    Cisco has released software updates that address this vulnerability.

    https://software.cisco.com
  • FixedCisco NX-OS Software 7.3(2)D1(3) when installed on Cisco Nexus 7000 Series Switchescisco_csaf

    Cisco has released software updates that address this vulnerability.

    https://software.cisco.com
  • FixedCisco NX-OS Software 7.3(2)D1(3a) when installed on Cisco Nexus 7000 Series Switchescisco_csaf

    Cisco has released software updates that address this vulnerability.

    https://software.cisco.com
  • FixedCisco NX-OS Software 7.3(3)D1(1) when installed on Cisco Nexus 7000 Series Switchescisco_csaf

    Cisco has released software updates that address this vulnerability.

    https://software.cisco.com
  • FixedCisco NX-OS Software 7.3(4)D1(1) when installed on Cisco Nexus 7000 Series Switchescisco_csaf

    Cisco has released software updates that address this vulnerability.

    https://software.cisco.com
  • FixedCisco NX-OS Software 7.3(5)D1(1) when installed on Cisco Nexus 7000 Series Switchescisco_csaf

    Cisco has released software updates that address this vulnerability.

    https://software.cisco.com
  • FixedCisco NX-OS Software 7.3(6)D1(1) when installed on Cisco Nexus 7000 Series Switchescisco_csaf

    Cisco has released software updates that address this vulnerability.

    https://software.cisco.com
  • FixedCisco NX-OS Software 8.1(1) when installed on Cisco MDS 9000 Multilayer Directors and Fabric Switchescisco_csaf

    Cisco has released software updates that address this vulnerability.

    https://software.cisco.com
  • FixedCisco NX-OS Software 8.1(1) when installed on Cisco Nexus 7000 Series Switchescisco_csaf

    Cisco has released software updates that address this vulnerability.

    https://software.cisco.com
  • FixedCisco NX-OS Software 8.1(1a) when installed on Cisco MDS 9000 Multilayer Directors and Fabric Switchescisco_csaf

    Cisco has released software updates that address this vulnerability.

    https://software.cisco.com
  • FixedCisco NX-OS Software 8.1(1b) when installed on Cisco MDS 9000 Multilayer Directors and Fabric Switchescisco_csaf

    Cisco has released software updates that address this vulnerability.

    https://software.cisco.com
  • FixedCisco NX-OS Software 8.1(2) when installed on Cisco Nexus 7000 Series Switchescisco_csaf

    Cisco has released software updates that address this vulnerability.

    https://software.cisco.com
  • FixedCisco NX-OS Software 8.1(2a) when installed on Cisco Nexus 7000 Series Switchescisco_csaf

    Cisco has released software updates that address this vulnerability.

    https://software.cisco.com
  • FixedCisco NX-OS Software 8.2(1) when installed on Cisco MDS 9000 Multilayer Directors and Fabric Switchescisco_csaf

    Cisco has released software updates that address this vulnerability.

    https://software.cisco.com
  • FixedCisco NX-OS Software 8.2(1) when installed on Cisco Nexus 7000 Series Switchescisco_csaf

    Cisco has released software updates that address this vulnerability.

    https://software.cisco.com
  • FixedCisco NX-OS Software 8.2(2) when installed on Cisco MDS 9000 Multilayer Directors and Fabric Switchescisco_csaf

    Cisco has released software updates that address this vulnerability.

    https://software.cisco.com
  • FixedCisco NX-OS Software 8.2(2) when installed on Cisco Nexus 7000 Series Switchescisco_csaf

    Cisco has released software updates that address this vulnerability.

    https://software.cisco.com
  • FixedCisco NX-OS Software 8.2(3) when installed on Cisco Nexus 7000 Series Switchescisco_csaf

    Cisco has released software updates that address this vulnerability.

    https://software.cisco.com
  • FixedCisco NX-OS Software 8.2(4) when installed on Cisco Nexus 7000 Series Switchescisco_csaf

    Cisco has released software updates that address this vulnerability.

    https://software.cisco.com
  • FixedCisco NX-OS Software 8.2(5) when installed on Cisco Nexus 7000 Series Switchescisco_csaf

    Cisco has released software updates that address this vulnerability.

    https://software.cisco.com
  • FixedCisco NX-OS Software 8.2(6) when installed on Cisco Nexus 7000 Series Switchescisco_csaf

    Cisco has released software updates that address this vulnerability.

    https://software.cisco.com
  • FixedCisco NX-OS Software 8.3(1) when installed on Cisco MDS 9000 Multilayer Directors and Fabric Switchescisco_csaf

    Cisco has released software updates that address this vulnerability.

    https://software.cisco.com
  • FixedCisco NX-OS Software 8.3(1) when installed on Cisco Nexus 7000 Series Switchescisco_csaf

    Cisco has released software updates that address this vulnerability.

    https://software.cisco.com
  • FixedCisco NX-OS Software 8.3(2) when installed on Cisco MDS 9000 Multilayer Directors and Fabric Switchescisco_csaf

    Cisco has released software updates that address this vulnerability.

    https://software.cisco.com
  • FixedCisco NX-OS Software 8.3(2) when installed on Cisco Nexus 7000 Series Switchescisco_csaf

    Cisco has released software updates that address this vulnerability.

    https://software.cisco.com
  • FixedCisco NX-OS Software 8.4(1) when installed on Cisco MDS 9000 Multilayer Directors and Fabric Switchescisco_csaf

    Cisco has released software updates that address this vulnerability.

    https://software.cisco.com
  • FixedCisco NX-OS Software 8.4(1) when installed on Cisco Nexus 7000 Series Switchescisco_csaf

    Cisco has released software updates that address this vulnerability.

    https://software.cisco.com
  • FixedCisco NX-OS Software 8.4(1a) when installed on Cisco MDS 9000 Multilayer Directors and Fabric Switchescisco_csaf

    Cisco has released software updates that address this vulnerability.

    https://software.cisco.com
  • FixedCisco NX-OS Software 8.4(2) when installed on Cisco MDS 9000 Multilayer Directors and Fabric Switchescisco_csaf

    Cisco has released software updates that address this vulnerability.

    https://software.cisco.com
  • FixedCisco NX-OS Software 8.4(2) when installed on Cisco Nexus 7000 Series Switchescisco_csaf

    Cisco has released software updates that address this vulnerability.

    https://software.cisco.com
  • FixedCisco NX-OS Software 8.4(2a) when installed on Cisco MDS 9000 Multilayer Directors and Fabric Switchescisco_csaf

    Cisco has released software updates that address this vulnerability.

    https://software.cisco.com
  • FixedCisco NX-OS Software 8.4(2b) when installed on Cisco MDS 9000 Multilayer Directors and Fabric Switchescisco_csaf

    Cisco has released software updates that address this vulnerability.

    https://software.cisco.com
  • FixedCisco NX-OS Software 8.4(3) when installed on Cisco Nexus 7000 Series Switchescisco_csaf

    Cisco has released software updates that address this vulnerability.

    https://software.cisco.com
  • FixedCisco NX-OS Software 9.2(1) when installed on Cisco Nexus 3000 Series Switchescisco_csaf

    Cisco has released software updates that address this vulnerability.

    https://software.cisco.com
  • FixedCisco NX-OS Software 9.2(1) when installed on Cisco Nexus 9000 Series Switchescisco_csaf

    Cisco has released software updates that address this vulnerability.

    https://software.cisco.com
  • FixedCisco NX-OS Software 9.2(2) when installed on Cisco Nexus 3000 Series Switchescisco_csaf

    Cisco has released software updates that address this vulnerability.

    https://software.cisco.com
  • FixedCisco NX-OS Software 9.2(2) when installed on Cisco Nexus 9000 Series Switchescisco_csaf

    Cisco has released software updates that address this vulnerability.

    https://software.cisco.com
  • FixedCisco NX-OS Software 9.2(2t) when installed on Cisco Nexus 3000 Series Switchescisco_csaf

    Cisco has released software updates that address this vulnerability.

    https://software.cisco.com
  • FixedCisco NX-OS Software 9.2(2v) when installed on Cisco Nexus 3000 Series Switchescisco_csaf

    Cisco has released software updates that address this vulnerability.

    https://software.cisco.com
  • FixedCisco NX-OS Software 9.2(3) when installed on Cisco Nexus 3000 Series Switchescisco_csaf

    Cisco has released software updates that address this vulnerability.

    https://software.cisco.com
  • FixedCisco NX-OS Software 9.2(3) when installed on Cisco Nexus 9000 Series Switchescisco_csaf

    Cisco has released software updates that address this vulnerability.

    https://software.cisco.com
  • FixedCisco NX-OS Software 9.2(3y) when installed on Cisco Nexus 3000 Series Switchescisco_csaf

    Cisco has released software updates that address this vulnerability.

    https://software.cisco.com
  • FixedCisco NX-OS Software 9.2(3y) when installed on Cisco Nexus 9000 Series Switchescisco_csaf

    Cisco has released software updates that address this vulnerability.

    https://software.cisco.com
  • FixedCisco NX-OS Software 9.2(4) when installed on Cisco Nexus 3000 Series Switchescisco_csaf

    Cisco has released software updates that address this vulnerability.

    https://software.cisco.com
  • FixedCisco NX-OS Software 9.2(4) when installed on Cisco Nexus 9000 Series Switchescisco_csaf

    Cisco has released software updates that address this vulnerability.

    https://software.cisco.com
  • FixedCisco NX-OS Software 9.3(1) when installed on Cisco Nexus 3000 Series Switchescisco_csaf

    Cisco has released software updates that address this vulnerability.

    https://software.cisco.com
  • FixedCisco NX-OS Software 9.3(1) when installed on Cisco Nexus 9000 Series Switchescisco_csaf

    Cisco has released software updates that address this vulnerability.

    https://software.cisco.com
  • FixedCisco NX-OS Software 9.3(1z) when installed on Cisco Nexus 9000 Series Switchescisco_csaf

    Cisco has released software updates that address this vulnerability.

    https://software.cisco.com
  • FixedCisco NX-OS Software 9.3(2) when installed on Cisco Nexus 3000 Series Switchescisco_csaf

    Cisco has released software updates that address this vulnerability.

    https://software.cisco.com
  • FixedCisco NX-OS Software 9.3(2) when installed on Cisco Nexus 9000 Series Switchescisco_csaf

    Cisco has released software updates that address this vulnerability.

    https://software.cisco.com
  • FixedCisco NX-OS Software 9.3(3) when installed on Cisco Nexus 3000 Series Switchescisco_csaf

    Cisco has released software updates that address this vulnerability.

    https://software.cisco.com
  • FixedCisco NX-OS Software 9.3(3) when installed on Cisco Nexus 9000 Series Switchescisco_csaf

    Cisco has released software updates that address this vulnerability.

    https://software.cisco.com
  • FixedCisco NX-OS Software 9.3(4) when installed on Cisco Nexus 3000 Series Switchescisco_csaf

    Cisco has released software updates that address this vulnerability.

    https://software.cisco.com
  • FixedCisco NX-OS Software 9.3(4) when installed on Cisco Nexus 9000 Series Switchescisco_csaf

    Cisco has released software updates that address this vulnerability.

    https://software.cisco.com
  • FixedCisco NX-OS Software 9.3(5) when installed on Cisco Nexus 3000 Series Switchescisco_csaf

    Cisco has released software updates that address this vulnerability.

    https://software.cisco.com
  • FixedCisco NX-OS Software 9.3(5) when installed on Cisco Nexus 9000 Series Switchescisco_csaf

    Cisco has released software updates that address this vulnerability.

    https://software.cisco.com
  • FixedCisco NX-OS Software 9.3(5w) when installed on Cisco Nexus 9000 Series Switchescisco_csaf

    Cisco has released software updates that address this vulnerability.

    https://software.cisco.com
  • FixedCisco Unified Computing System (Managed)cisco_csaf

    Cisco has released software updates that address this vulnerability.

    https://software.cisco.com
02

cvss

Technical severity, 0–10. One row per scoring source.

8.8
010

base score 0–10 · higher = more severe · hover a vector to decode⚠ sources disagree · medium–high · 4.9–8.8

v2.04.9mediumAV:A/AC:M/Au:S/C:P/I:P/A:Pprimary · NVD / NIST USexploitability 4.4 · impact 6.4
v3.18.8highCVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:Hprimary · NVD / NIST USexploitability 2.8 · impact 5.9
v3.18.8highAV:A/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:Hsecondary · FSTEC (BDU) RU
v3.18.8highCVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:Hsecondary · ENISA EU
v3.18.8highCVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:Hsecondary · psirt@cisco.com USexploitability 2.8 · impact 5.9
v3.18.1highCVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H/E:Usecondary · CVSS-BT (t0sche)
v3.18.8highCVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:Hsecondary · Cisco PSIRT US
03

ssvc

A stakeholder decision — act, attend, or track — from exploitation and impact.

Exploitation: none · Automatable: no · Technical Impact: totalcoordinatorcisa_ssvcUS
04

weaknesses

The CWE weakness classes this flaw belongs to.

CWE-787USCWE-787US
05

affected products (187)

Products and version ranges known to be affected.

showing 20 of 187
06

advisories (1)

Vendor and ecosystem advisories describing this.

  • cisco-sa-nxos-udld-rce-xetH6w35Cisco FXOS and NX-OS Software Unidirectional Link Detection Denial of Service and Arbitrary Code Execution Vulnerability2021-02-24csaf · cisco_csafUS

    A vulnerability in the Unidirectional Link Detection (UDLD) feature of Cisco FXOS Software and Cisco NX-OS Software could allow an unauthenticated, adjacent attacker to execute arbitrary code with administrative privileges or cause a denial of service (DoS) condition on an affected device. This vulnerability is due to insufficient input validation. An attacker could exploit this vulnerability by sending crafted Cisco UDLD protocol packets to a directly connected, affected device. A successful exploit could allow the attacker to execute arbitrary code with administrative privileges or cause the Cisco UDLD process to crash and restart multiple times, causing the affected device to reload and resulting in a DoS condition. Note: The UDLD feature is disabled by default, and the conditions to exploit this vulnerability are strict. The attacker needs full control of a directly connected device. That device must be connected over a port channel that has UDLD enabled. To trigger arbitrary code execution, both the UDLD-enabled port channel and specific system conditions must exist. In the absence of either the UDLD-enabled port channel or the system conditions, attempts to exploit this vulnerability will result in a DoS condition. It is possible, but highly unlikely, that an attacker could control the necessary conditions for exploitation. The CVSS score reflects this possibility. However, given the complexity of exploitation, Cisco has assigned a Medium Security Impact Rating (SIR) to this vulnerability. Cisco has released software updates that address this vulnerability. There are no workarounds that address this vulnerability.

07

also known as (4)

Other names and identifiers for this entity.

08

sources

Which sources assert this record, and when.

cnnvdenisa_euvdfstec_bducisco_csafNVDCVE.orgMITRE
published 2021-02-24modified 2026-06-17
09

references (6)

External citations — patches, advisories, analysis.

scry

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