How severe is CVE-2011-4667?

CVE-2011-4667 has a CVSS 3.x base score of 5.9, rated medium severity. It is exploitable over network with high attack complexity, requires no privileges and no user interaction. Impact on confidentiality is high, integrity none, and availability none.

Is CVE-2011-4667 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 1% (48th percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2011-4667?

CVE-2011-4667 primarily affects Cisco Ios. In total, 6 product configurations (CPEs) are listed as vulnerable; see the affected-products list for the exact versions.

How do I fix CVE-2011-4667?

Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround.

When was CVE-2011-4667 published?

CVE-2011-4667 was published on 2017-09-25 and last updated on 2026-06-16.

CVE-2011-4667

CVE-2011-4667 is a medium-severity vulnerability in Cisco Ios with a CVSS 3.x base score of 5.9. 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-310.

Key facts

Severity: Medium (CVSS 3.x base score 5.9)
CVSS v2: 4.3
EPSS exploit prediction: 1% (48th percentile)
Actively exploited: Not listed in CISA KEV
Weakness: CWE-310
Affected product: Cisco Ios
Published: 2017-09-25
Last modified: 2026-06-16

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.

Frequently asked questions

What is CVE-2011-4667?: 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.
How severe is CVE-2011-4667?: CVE-2011-4667 has a CVSS 3.x base score of 5.9, rated medium severity. It is exploitable over network with high attack complexity, requires no privileges and no user interaction. Impact on confidentiality is high, integrity none, and availability none.
Is CVE-2011-4667 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 1% (48th percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2011-4667?: CVE-2011-4667 primarily affects Cisco Ios. In total, 6 product configurations (CPEs) are listed as vulnerable; see the affected-products list for the exact versions.
How do I fix CVE-2011-4667?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround.
When was CVE-2011-4667 published?: CVE-2011-4667 was published on 2017-09-25 and last updated on 2026-06-16.

References

Affected products (6)

cpe:2.3:o:cisco:ios:12.2\(33\)sxi:*:*:*:*:*:*:*
cpe:2.3:o:cisco:ios:12.2\(33\)sxj:*:*:*:*:*:*:*
cpe:2.3:o:cisco:ios:15.2\(1\)t:*:*:*:*:*:*:*
cpe:2.3:o:cisco:ios:15.2\(1\)t1:*:*:*:*:*:*:*
cpe:2.3:o:cisco:ios:15.2\(2\)t:*:*:*:*:*:*:*
cpe:2.3:o:cisco:nx-os:5.0\(5\):*:*:*:*:*:*:*

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