Cisco NX-OS Software Link Layer Discovery Protocol Denial of Service Vulnerability
A vulnerability in the Link Layer Discovery Protocol (LLDP) feature of Cisco NX-OS Software could allow an unauthenticated, adjacent attacker to cause the LLDP process to restart, which could cause an affected device to reload unexpectedly. This vulnerability is due to improper handling of specific fields in an LLDP frame. An attacker could exploit this vulnerability by sending a crafted LLDP packet to an interface of an affected device. A successful exploit could allow the attacker to cause the device to reload, resulting in a denial of service (DoS) condition. Note: LLDP is a Layer 2 link protocol. To exploit this vulnerability, an attacker would need to be directly connected to an interface of an affected device, either physically or logically (for example, through a Layer 2 Tunnel configured to transport the LLDP protocol). Cisco has released software updates that address this vulnerability. There are no workarounds that address this vulnerability. This advisory is part of the February 2026 Cisco FXOS and NX-OS Software Security Advisory Bundled Publication. For a complete list of the advisories and links to them, see Cisco Event Response: February 2026 Semiannual Cisco FXOS and NX-OS Software Security Advisory Bundled Publication ["https://sec.cloudapps.cisco.com/security/center/viewErp.x?alertId=ERP-75740"].
describes (1)
Related CVEs.
| ID | severity | exploitable | ||
|---|---|---|---|---|
| CVE-2026-20010US | — | — | ||
A vulnerability in the Link Layer Discovery Protocol (LLDP) feature of Cisco NX-OS Software could allow an unauthenticated, adjacent attacker to cause the LLDP process to restart,… | ||||
references
External citations — patches, advisories, analysis.
- Cisco Nexus 3000 Series Switchesexternal
- Cisco Nexus 5500 Platform Switchesexternal
- Cisco Nexus 6000 Series Switchesexternal
- Cisco Nexus 9000 Series Switchesexternal
- Cisco Nexus 7000 Series Switchesexternal
- Security Vulnerability Policyexternal
- CSCwi75282)external
- CSCwq33193)external
remediations (58)
- Fixed4.3(4b)
Cisco has released software updates that address this vulnerability.
https://software.cisco.com - Fixed4.3(4c)
Cisco has released software updates that address this vulnerability.
https://software.cisco.com - Fixed4.3(4d)
Cisco has released software updates that address this vulnerability.
https://software.cisco.com - Fixed4.3(4e)
Cisco has released software updates that address this vulnerability.
https://software.cisco.com - Fixed4.3(4f)
Cisco has released software updates that address this vulnerability.
https://software.cisco.com - Fixed4.3(5a)
Cisco has released software updates that address this vulnerability.
https://software.cisco.com - Fixed4.3(5c)
Cisco has released software updates that address this vulnerability.
https://software.cisco.com - Fixed4.3(5d)
Cisco has released software updates that address this vulnerability.
https://software.cisco.com - Fixed4.3(5e)
Cisco has released software updates that address this vulnerability.
https://software.cisco.com - Fixed4.3(6a)
Cisco has released software updates that address this vulnerability.
https://software.cisco.com - Fixed4.3(6b)
Cisco has released software updates that address this vulnerability.
https://software.cisco.com - Fixed4.3(6c)
Cisco has released software updates that address this vulnerability.
https://software.cisco.com - Fixed4.3(6d)
Cisco has released software updates that address this vulnerability.
https://software.cisco.com - FixedCisco NX-OS Software 10.3(1) when installed on Cisco Nexus 3000 Series Switches
Cisco has released software updates that address this vulnerability.
https://software.cisco.com - FixedCisco NX-OS Software 10.3(1) when installed on Cisco Nexus 9000 Series Switches
Cisco has released software updates that address this vulnerability.
https://software.cisco.com - FixedCisco NX-OS Software 10.3(2) when installed on Cisco Nexus 3000 Series Switches
Cisco has released software updates that address this vulnerability.
https://software.cisco.com - FixedCisco NX-OS Software 10.3(2) when installed on Cisco Nexus 9000 Series Switches
Cisco has released software updates that address this vulnerability.
https://software.cisco.com - FixedCisco NX-OS Software 10.3(3) when installed on Cisco Nexus 3000 Series Switches
Cisco has released software updates that address this vulnerability.
https://software.cisco.com - FixedCisco NX-OS Software 10.3(3) when installed on Cisco Nexus 9000 Series Switches
Cisco has released software updates that address this vulnerability.
https://software.cisco.com - FixedCisco NX-OS Software 10.3(3o) when installed on Cisco Nexus 9000 Series Switches
Cisco has released software updates that address this vulnerability.
https://software.cisco.com - FixedCisco NX-OS Software 10.3(3p) when installed on Cisco Nexus 9000 Series Switches
Cisco has released software updates that address this vulnerability.
https://software.cisco.com - FixedCisco NX-OS Software 10.3(3q) when installed on Cisco Nexus 9000 Series Switches
Cisco has released software updates that address this vulnerability.
https://software.cisco.com - FixedCisco NX-OS Software 10.3(3r) when installed on Cisco Nexus 9000 Series Switches
Cisco has released software updates that address this vulnerability.
https://software.cisco.com - FixedCisco NX-OS Software 10.3(3w) when installed on Cisco Nexus 9000 Series Switches
Cisco has released software updates that address this vulnerability.
https://software.cisco.com - FixedCisco NX-OS Software 10.3(3x) when installed on Cisco Nexus 9000 Series Switches
Cisco has released software updates that address this vulnerability.
https://software.cisco.com - FixedCisco NX-OS Software 10.3(4) when installed on Cisco Nexus 3000 Series Switches
Cisco has released software updates that address this vulnerability.
https://software.cisco.com - FixedCisco NX-OS Software 10.3(4) when installed on Cisco Nexus 9000 Series Switches
Cisco has released software updates that address this vulnerability.
https://software.cisco.com - FixedCisco NX-OS Software 10.3(4a) when installed on Cisco Nexus 3000 Series Switches
Cisco has released software updates that address this vulnerability.
https://software.cisco.com - FixedCisco NX-OS Software 10.3(4a) when installed on Cisco Nexus 9000 Series Switches
Cisco has released software updates that address this vulnerability.
https://software.cisco.com - FixedCisco NX-OS Software 10.3(4g) when installed on Cisco Nexus 9000 Series Switches
Cisco has released software updates that address this vulnerability.
https://software.cisco.com - FixedCisco NX-OS Software 10.3(4h) when installed on Cisco Nexus 9000 Series Switches
Cisco has released software updates that address this vulnerability.
https://software.cisco.com - FixedCisco NX-OS Software 10.3(99w) when installed on Cisco Nexus 9000 Series Switches
Cisco has released software updates that address this vulnerability.
https://software.cisco.com - FixedCisco NX-OS Software 10.3(99x) when installed on Cisco Nexus 9000 Series Switches
Cisco has released software updates that address this vulnerability.
https://software.cisco.com - FixedCisco NX-OS Software 10.4(1) when installed on Cisco Nexus 3000 Series Switches
Cisco has released software updates that address this vulnerability.
https://software.cisco.com - FixedCisco NX-OS Software 10.4(1) when installed on Cisco Nexus 9000 Series Switches
Cisco has released software updates that address this vulnerability.
https://software.cisco.com - FixedCisco NX-OS Software 10.4(2) when installed on Cisco Nexus 3000 Series Switches
Cisco has released software updates that address this vulnerability.
https://software.cisco.com - FixedCisco NX-OS Software 10.4(2) when installed on Cisco Nexus 9000 Series Switches
Cisco has released software updates that address this vulnerability.
https://software.cisco.com - FixedCisco NX-OS System Software in ACI Mode 16.0(2h) when installed on Cisco Nexus 9000 Series Switches
Cisco has released software updates that address this vulnerability.
https://software.cisco.com - FixedCisco NX-OS System Software in ACI Mode 16.0(2j) when installed on Cisco Nexus 9000 Series Switches
Cisco has released software updates that address this vulnerability.
https://software.cisco.com - FixedCisco NX-OS System Software in ACI Mode 16.0(3d) when installed on Cisco Nexus 9000 Series Switches
Cisco has released software updates that address this vulnerability.
https://software.cisco.com - FixedCisco NX-OS System Software in ACI Mode 16.0(3e) when installed on Cisco Nexus 9000 Series Switches
Cisco has released software updates that address this vulnerability.
https://software.cisco.com - FixedCisco NX-OS System Software in ACI Mode 16.0(3g) when installed on Cisco Nexus 9000 Series Switches
Cisco has released software updates that address this vulnerability.
https://software.cisco.com - FixedCisco NX-OS System Software in ACI Mode 16.0(4c) when installed on Cisco Nexus 9000 Series Switches
Cisco has released software updates that address this vulnerability.
https://software.cisco.com - FixedCisco NX-OS System Software in ACI Mode 16.0(5h) when installed on Cisco Nexus 9000 Series Switches
Cisco has released software updates that address this vulnerability.
https://software.cisco.com - FixedCisco NX-OS System Software in ACI Mode 16.0(5j) when installed on Cisco Nexus 9000 Series Switches
Cisco has released software updates that address this vulnerability.
https://software.cisco.com - FixedCisco NX-OS System Software in ACI Mode 16.0(6c) when installed on Cisco Nexus 9000 Series Switches
Cisco has released software updates that address this vulnerability.
https://software.cisco.com - FixedCisco NX-OS System Software in ACI Mode 16.0(6h) when installed on Cisco Nexus 9000 Series Switches
Cisco has released software updates that address this vulnerability.
https://software.cisco.com - FixedCisco NX-OS System Software in ACI Mode 16.0(7e) when installed on Cisco Nexus 9000 Series Switches
Cisco has released software updates that address this vulnerability.
https://software.cisco.com - FixedCisco NX-OS System Software in ACI Mode 16.0(8e) when installed on Cisco Nexus 9000 Series Switches
Cisco has released software updates that address this vulnerability.
https://software.cisco.com - FixedCisco NX-OS System Software in ACI Mode 16.0(8f) when installed on Cisco Nexus 9000 Series Switches
Cisco has released software updates that address this vulnerability.
https://software.cisco.com - FixedCisco NX-OS System Software in ACI Mode 16.0(8h) when installed on Cisco Nexus 9000 Series Switches
Cisco has released software updates that address this vulnerability.
https://software.cisco.com - FixedCisco NX-OS System Software in ACI Mode 16.0(9c) when installed on Cisco Nexus 9000 Series Switches
Cisco has released software updates that address this vulnerability.
https://software.cisco.com - FixedCisco NX-OS System Software in ACI Mode 16.0(9d) when installed on Cisco Nexus 9000 Series Switches
Cisco has released software updates that address this vulnerability.
https://software.cisco.com - FixedCisco NX-OS System Software in ACI Mode 16.1(1f) when installed on Cisco Nexus 9000 Series Switches
Cisco has released software updates that address this vulnerability.
https://software.cisco.com - FixedCisco NX-OS System Software in ACI Mode 16.1(2f) when installed on Cisco Nexus 9000 Series Switches
Cisco has released software updates that address this vulnerability.
https://software.cisco.com - FixedCisco NX-OS System Software in ACI Mode 16.1(2g) when installed on Cisco Nexus 9000 Series Switches
Cisco has released software updates that address this vulnerability.
https://software.cisco.com - FixedCisco NX-OS System Software in ACI Mode 16.1(3f) when installed on Cisco Nexus 9000 Series Switches
Cisco has released software updates that address this vulnerability.
https://software.cisco.com - FixedCisco NX-OS System Software in ACI Mode 16.1(3g) when installed on Cisco Nexus 9000 Series Switches
Cisco has released software updates that address this vulnerability.
https://software.cisco.com
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