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Unrated severityNVD Advisory· Published Sep 14, 2011· Updated Jun 16, 2026

CVE-2011-2581

CVE-2011-2581

Description

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.

AI Insight

LLM-synthesized narrative grounded in this CVE's description and references.

Affected products

14
  • Cisco Systems, Inc./Nx OS11 versions
    cpe:2.3:a:cisco:nx-os:5.0\(2\):*:*:*:*:*:*:*+ 10 more
    • cpe:2.3:a:cisco:nx-os:5.0\(2\):*:*:*:*:*:*:*
    • cpe:2.3:a:cisco:nx-os:5.0\(3\)n1\(1\):*:*:*:*:*:*:*
    • cpe:2.3:a:cisco:nx-os:5.0\(3\)n1\(1a\):*:*:*:*:*:*:*
    • cpe:2.3:a:cisco:nx-os:5.0\(3\)n1\(1b\):*:*:*:*:*:*:*
    • cpe:2.3:o:cisco:nx-os:*:*:*:*:*:*:*:*range: <=5.0\(3\)u1\(2\)
    • cpe:2.3:o:cisco:nx-os:5.0\(3\):*:*:*:*:*:*:*
    • cpe:2.3:o:cisco:nx-os:5.0\(3\)n1\(1c\):*:*:*:*:*:*:*
    • cpe:2.3:o:cisco:nx-os:5.0\(3\)u1\(1a\):*:*:*:*:*:*:*
    • cpe:2.3:o:cisco:nx-os:5.0\(3\)u1\(1b\):*:*:*:*:*:*:*
    • cpe:2.3:o:cisco:nx-os:5.0\(3\)u1\(1d\):*:*:*:*:*:*:*
    • (no CPE)range: <5.0(3)N2(1) for Nexus 5000; <5.0(3)U1(2a) for Nexus 3000
  • Cisco Systems, Inc./Nexus 3048
    cpe:2.3:h:cisco:nexus_3000:*:*:*:*:*:*:*:*
  • Cisco Systems, Inc./Nexus 5000
    cpe:2.3:h:cisco:nexus_5000:*:*:*:*:*:*:*:*
  • Cisco Systems, Inc./Nexus Series Switchesllm-fuzzy
    Range: <5.0(3)N2(1)

Patches

Vulnerability mechanics

References

3

News mentions

0

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