What’s Vulnerable › Vulnerabilities

CVE-2011-4667

• Severity: medium (CVSS 5.9 v3.0)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 0.7% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2017-09-25 · updated 2026-06-16
• Weakness: CWE-310

Description

The encryption library in Cisco IOS Software 15.2(1)T, 15.2(1)T1, and 15.2(2)T, Cisco NX-OS in Cisco MDS 9222i Multiservice Modular Switch, Cisco MDS 9000 18/4-Port Multiservice Module, and Cisco MDS 9000 Storage Services Node module before 5.2(6), and Cisco IOS in Cisco VPN Services Port Adaptor for Catalyst 6500 12.2(33)SXI, and 12.2(33)SXJ when IP Security (aka IPSec) is used, allows remote attackers to obtain unencrypted packets from encrypted sessions.

Affected products

• Cisco IOS: 12.2(33)sxi, 12.2(33)sxj, 15.2(1)t, 15.2(1)t1, 15.2(2)t
• Cisco NX-OS: 5.0(5)

References

• https://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/Cisco-SA-20120913-CVE-2011-4667
• https://www.cisco.com/c/en/us/td/docs/switches/lan/catalyst6500/ios/12-2SX/release/notes/ol_14271/caveats_SXI_rebuilds.html
• https://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/Cisco-SA-20120913-CVE-2011-4667
• https://www.cisco.com/c/en/us/td/docs/switches/lan/catalyst6500/ios/12-2SX/release/notes/ol_14271/caveats_SXI_rebuilds.html

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