CVE-2024-20446
highpriority · track · 0EPSS 0.008 · 56 %ileDEEURUUSEPSS · scored 2026-10-27
A vulnerability in the DHCPv6 relay agent of Cisco NX-OS Software could allow an unauthenticated, remote attacker to cause a denial of service (DoS) condition on an affected device. This vulnerability is due to improper handling of specific fields in a DHCPv6 RELAY-REPLY message. An attacker could exploit this vulnerability by sending a crafted DHCPv6 packet to any IPv6 address that is configured on an affected device. A successful exploit could allow the attacker to cause the dhcp_snoop process to crash and restart multiple times, causing the affected device to reload and resulting in a DoS condition.
remediations
Vendor fix, mitigation, or workaround guidance, as published by each source.
A vendor fix is available.
- FixedCisco NX-OS Software 10.2(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 10.2(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 10.2(1q) 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 8.2(11) 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 9.3(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 9.3(9) when installed on Cisco Nexus 9000 Series Switchescisco_csaf
Cisco has released software updates that address this vulnerability.
https://software.cisco.com
cvss
Technical severity, 0–10. One row per scoring source.
base score 0–10 · higher = more severe · hover a vector to decode
ssvc
A stakeholder decision — act, attend, or track — from exploitation and impact.
weaknesses
The CWE weakness classes this flaw belongs to.
affected products (24)
Products and version ranges known to be affected.
- Cisco Unified Computing System (UCS) 6400all versionscert_bundDEcpe:/h:cisco:unified_computing_system:6400
- Cisco Unified Computing System (UCS) 6500all versionscert_bundDEcpe:/h:cisco:unified_computing_system:6500
advisories (2)
Vendor and ecosystem advisories describing this.
- WID-SEC-W-2024-1949Cisco NX-OS: Mehrere SchwachstellenDeutsch2024-08-28csaf · cert_bundDE
Ein lokaler oder entfernter, anonymer Angreifer kann mehrere Schwachstellen in Cisco NX-OS ausnutzen, um beliebigen Programmcode auszuführen, erweiterte Rechte zu erlangen und einen Denial-of-Service-Zustand zu erzeugen.
- cisco-sa-nxos-dhcp6-relay-dos-znEAA6xnCisco NX-OS Software DHCPv6 Relay Agent Denial of Service Vulnerability2024-08-28csaf · cisco_csafUS
A vulnerability in the DHCPv6 relay agent of Cisco NX-OS Software could allow an unauthenticated, remote attacker to cause a denial of service (DoS) condition on an affected device. This vulnerability is due to improper handling of specific fields in a DHCPv6 RELAY-REPLY message. An attacker could exploit this vulnerability by sending a crafted DHCPv6 packet to any IPv6 address that is configured on an affected device. A successful exploit could allow the attacker to cause the dhcp_snoop process to crash and restart multiple times, causing the affected device to reload and resulting in a DoS condition. Cisco has released software updates that address this vulnerability. There are no workarounds that address this vulnerability. This advisory is part of the August 2024 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: August 2024 Semiannual Cisco FXOS and NX-OS Software Security Advisory Bundled Publication ["https://sec.cloudapps.cisco.com/security/center/viewErp.x?alertId=ERP-75417"].
also known as (4)
Other names and identifiers for this entity.
sources
Which sources assert this record, and when.
references (5)
External citations — patches, advisories, analysis.
- https://cxsecurity.com/cveshow/CVE-2024-20446/cnnvd
- https://sec.cloudapps.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-nxos-dhcp6-relay-dos-znEAA6xncnnvd
- https://vigilance.fr/vulnerability/Cisco-NX-OS-denial-of-service-via-DHCPv6-Relay-Agent-45035cnnvd
- https://sec.cloudapps.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-nxos-dhcp6-relay-dos-znEAA6xnenisa_euvd
- https://sec.cloudapps.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-nxos-dhcp6-relay-dos-znEAA6xnnvd
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