Vulnerability in Cisco NX-OS Software

[ Description ]Official description

A vulnerability in Cisco NX-OS Software could allow an unauthenticated, remote attacker to exhaust system resources, causing a denial of service (DoS) condition. This vulnerability exists because rate limiting was improperly applied to some protocols. An attacker could exploit this vulnerability by sending a high rate of UDP or TCP connections to a data plane interface on an affected device. A successful exploit could allow the attacker to cause instability to various routing and control plane protocols through some packet loss and temporary disruptions, causing a DoS condition. This DoS condition will clear without manual intervention soon after the high rate of traffic is stopped.

[ 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

• NCSC-NL8 Oct 2026NCSC-2026-0406

  Vulnerabilities fixed in Cisco NX-OS Software Translated from Dutch

  Probability/damage M/HCVE-2026-20032CVE-2026-20173CVE-2026-76453+6 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-nxos-nsc…