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CVE-2011-4667

20
FAUCET Score

CVE-2011-4667 describes a vulnerability in the encryption libraries of specific versions of Cisco IOS and NX-OS software, impacting devices like the Cisco MDS 9222i, MDS 9000 modules, and VPN Services Port Adaptor, when IP Security (IPSec) is in use. This medium-severity vulnerability (CVSS 5.9) allows remote attackers, with high attack complexity, to intercept and obtain unencrypted packets from otherwise encrypted sessions, leading to a high confidentiality impact. Despite its potential for data exposure, there is no evidence of active exploitation, public exploit code (Metasploit, Nuclei, ExploitDB), or significant community discussion or media coverage surrounding this CVE.

Impacted Technologies

VendorProductVersion(s)CPE
12.2\(33\)sxiCPE matchmatch criteria
cpe:2.3:o:cisco:ios:12.2\(33\)sxi:*:*:*:*:*:*:*
12.2\(33\)sxjCPE matchmatch criteria
cpe:2.3:o:cisco:ios:12.2\(33\)sxj:*:*:*:*:*:*:*
15.2\(1\)tCPE matchmatch criteria
cpe:2.3:o:cisco:ios:15.2\(1\)t:*:*:*:*:*:*:*
15.2\(1\)t1CPE matchmatch criteria
cpe:2.3:o:cisco:ios:15.2\(1\)t1:*:*:*:*:*:*:*
15.2\(2\)tCPE matchmatch criteria
cpe:2.3:o:cisco:ios:15.2\(2\)t:*:*:*:*:*:*:*

CVSS Data

CVSS version used by this source: 3.0

5.9MEDIUM

CVSS:3.0/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:N/A:N

Attack Vector
NETWORK
Attack Complexity
HIGH
Privileges Required
NONE
User Interaction
NONE
Scope
UNCHANGED
Confidentiality Impact
HIGH
Integrity Impact
NONE
Availability Impact
NONE
Exploitability Score
2.2
Impact Score
3.6
CvssVersion
3.0

Exploit Intelligence

EPSS Score
0.69%
Probability of exploitation in next 30 days
EPSS Percentile
49.0%
Percentile rank of EPSS score among Peer Group
As of 2026-07-25
Model: v2026.06.15
This CVE's current EPSS score of 0.0069 is in the 9th percentile among its peer group of 19,955 CVEs.

Social Chatter

The average CVE in this peer group has 0.0 Twitter, 0.0 Reddit, 0.0 Bluesky, 0.0 Mastodon, and 0.2 GitHub mentions.

Media Mentions

No media coverage found for this CVE.

The average CVE in this peer group has 0.0 InfoSec Media, 0.0 Vendor Blog, and 0.0 Security Researcher mentions.

Remediation

Vendor Patches (1)

ciscovendor investigatingvia nvd_reference
View patch

References

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