CVE-2013-5566: Cisco NX-OS

Medium severity, CVSS 5.0. EPSS: 1.9% chance of exploitation in the next 30 days.

Cisco NX-OS 5.0 and earlier on MDS 9000 devices allows remote attackers to cause a denial of service (supervisor CPU consumption) via Authentication Header (AH) authentication in a Virtual Router Redundancy Protocol (VRRP) frame, aka Bug ID CSCte27874.

Affected products

• Cisco NX-OS: up to and including 5.0; version 4.0 only; version 4.0(0)n1(1a) only; version 4.0(0)n1(2) only; version 4.0(0)n1(2a) only; version 4.0(1a)n1(1) only; …

Published 2013-11-08. Last modified 2026-06-16.