CVE-2011-4023

CVE-2011-4023 is a high-severity vulnerability in Cisco Nx-os with a CVSS 2.0 base score of 7.8. It is not currently listed as actively exploited by CISA, and its EPSS exploit-prediction score is low. The underlying weakness is classified as CWE-399.

Key facts

• Severity: High (CVSS 2.0 base score 7.8)
• EPSS exploit prediction: 1% (68th percentile)
• Actively exploited: Not listed in CISA KEV
• Weakness: CWE-399
• Affected product: Cisco Nx-os
• Published: 2012-05-03
• Last modified: 2026-06-16

Description

Memory leak in libcmd in Cisco NX-OS 5.0 on Nexus switches allows remote authenticated users to cause a denial of service (memory consumption) via SNMP requests, aka Bug ID CSCtr65682.

Frequently asked questions

What is CVE-2011-4023?

Memory leak in libcmd in Cisco NX-OS 5.0 on Nexus switches allows remote authenticated users to cause a denial of service (memory consumption) via SNMP requests, aka Bug ID CSCtr65682.

How severe is CVE-2011-4023?

CVE-2011-4023 has a CVSS 2.0 base score of 7.8, rated high severity.

Is CVE-2011-4023 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 1% (68th percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2011-4023?

CVE-2011-4023 primarily affects Cisco Nx-os. In total, 27 product configurations (CPEs) are listed as vulnerable; see the affected-products list for the exact versions.

How do I fix CVE-2011-4023?

Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Given its high severity, prioritise patching exposed systems.

When was CVE-2011-4023 published?

CVE-2011-4023 was published on 2012-05-03 and last updated on 2026-06-16.

References

• http://www.cisco.com/en/US/docs/switches/datacenter/nexus5000/sw/release/notes/Rel_5_0_3_N2_1/Nexus5000_Release_Notes_5_0_3_N2.html

Affected products (27)

• cpe:2.3:o:cisco:nx-os:5.0:*:*:*:*:*:*:*
• cpe:2.3:o:cisco:nx-os:5.0\(2\):*:*:*:*:*:*:*
• cpe:2.3:o:cisco:nx-os:5.0\(2\)n1\(1\):*:*:*:*:*:*:*
• cpe:2.3:o:cisco:nx-os:5.0\(2\)n2\(1\):*:*:*:*:*:*:*
• cpe:2.3:o:cisco:nx-os:5.0\(2\)n2\(1a\):*:*:*:*:*:*:*
• cpe:2.3:o:cisco:nx-os:5.0\(2a\):*:*:*:*:*:*:*
• cpe:2.3:o:cisco:nx-os:5.0\(3\):*:*:*:*:*:*:*
• cpe:2.3:o:cisco:nx-os:5.0\(3\)n1\(1\):*:*:*:*:*:*:*
• cpe:2.3:o:cisco:nx-os:5.0\(3\)n1\(1a\):*:*:*:*:*:*:*
• cpe:2.3:o:cisco:nx-os:5.0\(3\)n1\(1b\):*:*:*:*:*:*:*
• cpe:2.3:o:cisco:nx-os:5.0\(3\)n1\(1c\):*:*:*:*:*:*:*
• cpe:2.3:o:cisco:nx-os:5.0\(3\)n2\(1\):*:*:*:*:*:*:*
• cpe:2.3:o:cisco:nx-os:5.0\(3\)n2\(2\):*:*:*:*:*:*:*
• cpe:2.3:o:cisco:nx-os:5.0\(3\)n2\(2a\):*:*:*:*:*:*:*
• cpe:2.3:o:cisco:nx-os:5.0\(3\)n2\(2b\):*:*:*:*:*:*:*
• cpe:2.3:o:cisco:nx-os:5.0\(5\):*:*:*:*:*:*:*
• cpe:2.3:h:cisco:nexus_2148t_fex_switch:-:*:*:*:*:*:*:*
• cpe:2.3:h:cisco:nexus_2224tp_fex_switch:-:*:*:*:*:*:*:*
• cpe:2.3:h:cisco:nexus_2232pp_fex_switch:-:*:*:*:*:*:*:*
• cpe:2.3:h:cisco:nexus_2232tm_fex_switch:-:*:*:*:*:*:*:*
• cpe:2.3:h:cisco:nexus_2248tp_e_fex_switch:-:*:*:*:*:*:*:*
• cpe:2.3:h:cisco:nexus_2248tp_fex_switch:-:*:*:*:*:*:*:*
• cpe:2.3:h:cisco:nexus_5010p_switch:-:*:*:*:*:*:*:*
• cpe:2.3:h:cisco:nexus_5020p_switch:-:*:*:*:*:*:*:*
• cpe:2.3:h:cisco:nexus_5548p:-:*:*:*:*:*:*:*
• cpe:2.3:h:cisco:nexus_5548up:-:*:*:*:*:*:*:*
• cpe:2.3:h:cisco:nexus_5596up:-:*:*:*:*:*:*:*

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Other CWE-399 (Resource Management Errors) vulnerabilities

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• CVE-2015-0339 — Critical (CVSS 10.0): Adobe Flash Player before 13.0.0.277 and 14.x through 17.x before 17.0.0.134 on Windows and OS X and before…
• CVE-2015-0335 — Critical (CVSS 10.0): Adobe Flash Player before 13.0.0.277 and 14.x through 17.x before 17.0.0.134 on Windows and OS X and before…
• CVE-2015-0333 — Critical (CVSS 10.0): Adobe Flash Player before 13.0.0.277 and 14.x through 17.x before 17.0.0.134 on Windows and OS X and before…
• CVE-2014-4121 — Critical (CVSS 10.0): Microsoft .NET Framework 2.0 SP2, 3.5, 3.5.1, 4, 4.5, 4.5.1, and 4.5.2 does not properly parse internationalized…
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