Vulnerability in Cisco NX-OS Software

[ Why it matters ]Priority signals

• Critical severity: CVSS 9.8

[ Description ]Official description

A vulnerability in the Segment Routing over IPv6 (SRv6) Operation, Administration, and Maintenance (OAM) feature of Cisco NX-OS Software, known as NGOAM, could allow an unauthenticated, remote attacker to execute arbitrary code with root privileges or cause a denial of service (DoS) on an affected device. This vulnerability is due to improper input validation of IP traffic when the NGOAM and SRv6 features are enabled. An attacker could exploit this vulnerability by sending crafted packets to an IP interface on an affected device. A successful exploit could allow the attacker to execute arbitrary code with root privileges and could cause process crashes resulting in a reload and DoS condition.

[ Fixes ]Fixes and patches

No fix or interim patch is linked from our sources yet. Check the vendor references below and limit exposure of affected systems until a fix is available.

[ Advisories ]Government CERT advisories

• CERT-FR8 Oct 2026CERTFR-2026-AVI-1282

  Multiple vulnerabilities in Cisco products Translated from French

  Multiple vulnerabilities have been discovered in Cisco products. Some of them allow an attacker to cause remote arbitrary code execution, privilege escalation and remote denial of service.

  CVE-2026-76471CVE-2026-76455CVE-2026-76482+27 more CVEs
• BSI CERT-Bund7 Oct 2026WID-SEC-2026-3810

  Cisco Nexus and Cisco NX-OS: Multiple vulnerabilities Translated from German

  CVE-2026-76455CVE-2026-20038CVE-2026-76471+11 more CVEs

[ References ]References

• sec.cloudapps.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-ngoam-rc…