Is CVE-2011-2581 being actively exploited?

CVE-2011-2581 is not currently listed in the CISA Known Exploited Vulnerabilities (KEV) catalog.

What is the CVSS score for CVE-2011-2581?

CVE-2011-2581 has a CVSS 2.0 base score of 5.0 (MEDIUM).

CVE-2011-2581

MEDIUM · CVSS 5.0EPSS 2.0%EU EUVD

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.

Key facts

CVSS score: 5.0 (v2.0)
Severity: MEDIUM
CVSS vector: AV:N/AC:L/Au:N/C:P/I:N/A:N
Weakness (CWE): CWE-264
EPSS score: 2.0% (81th percentile)
In CISA KEV: No
In EU EUVD: Yes (EUVD-2011-2564)
Published: September 14, 2011
NVD last modified: June 16, 2026
Status: Modified

EU Vulnerability Database (EUVD)

This vulnerability is also tracked by ENISA as EUVD-2011-2564 in the EU Vulnerability Database. Last updated in EUVD on August 6, 2024.

View on the EU Vulnerability Database

Affected products

cisco / nexus 3000
cisco / nexus 5000
cisco / nx-os
cisco / nx-os
cisco / nx-os
cisco / nx-os
cisco / nx-os
cisco / nx-os
cisco / nx-os
cisco / nx-os
cisco / nx-os
cisco / nx-os

References

Last updated September 17, 2026 · Source: NVD, CISA KEV, FIRST.org EPSS

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