CVE-2011-2581: Cisco Nexus 3000

Medium severity, CVSS 5.0. EPSS: 2% chance of exploitation in the next 30 days.

The ACL implementation in Cisco NX-OS 5.0(2) and 5.0(3) before 5.0(3)N2(1) on Nexus 5000 series switches, and NX-OS before 5.0(3)U1(2a) on Nexus 3000 series switches, does not properly handle comments in conjunction with deny statements, which allows remote attackers to bypass intended access restrictions in opportunistic circumstances by sending packets, aka Bug IDs CSCto09813 and CSCtr61490.

Affected products

• Cisco Nexus 3000
• Cisco Nexus 5000
• Cisco NX-OS: version 5.0(2) only; version 5.0(3)n1(1) only; version 5.0(3)n1(1a) only; version 5.0(3)n1(1b) only; version 5.0(3) only; version 5.0(3)n1(1c) only; …

Published 2011-09-14. Last modified 2026-06-16.