How severe is CVE-2012-1311?

CVE-2012-1311 has a CVSS 2.0 base score of 7.8, rated high severity.

Is CVE-2012-1311 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 2% (79th percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2012-1311?

CVE-2012-1311 primarily affects Cisco Ios. In total, 7 product configurations (CPEs) are listed as vulnerable; see the affected-products list for the exact versions.

How do I fix CVE-2012-1311?

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-2012-1311 published?

CVE-2012-1311 was published on 2012-03-29 and last updated on 2026-06-16.

CVE-2012-1311

CVE-2012-1311 is a high-severity vulnerability in Cisco Ios 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: 2% (79th percentile)
Actively exploited: Not listed in CISA KEV
Weakness: CWE-399
Affected product: Cisco Ios
Published: 2012-03-29
Last modified: 2026-06-16

Description

The RSVP feature in Cisco IOS 15.0 and 15.1 and IOS XE 3.2.xS through 3.4.xS before 3.4.2S, when a VRF interface is configured, allows remote attackers to cause a denial of service (interface queue wedge and service outage) via crafted RSVP packets, aka Bug ID CSCts80643.

Frequently asked questions

What is CVE-2012-1311?: The RSVP feature in Cisco IOS 15.0 and 15.1 and IOS XE 3.2.xS through 3.4.xS before 3.4.2S, when a VRF interface is configured, allows remote attackers to cause a denial of service (interface queue wedge and service outage) via crafted RSVP packets, aka Bug ID CSCts80643.
How severe is CVE-2012-1311?: CVE-2012-1311 has a CVSS 2.0 base score of 7.8, rated high severity.
Is CVE-2012-1311 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 2% (79th percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2012-1311?: CVE-2012-1311 primarily affects Cisco Ios. In total, 7 product configurations (CPEs) are listed as vulnerable; see the affected-products list for the exact versions.
How do I fix CVE-2012-1311?: 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-2012-1311 published?: CVE-2012-1311 was published on 2012-03-29 and last updated on 2026-06-16.

References

Affected products (7)

cpe:2.3:o:cisco:ios:15.0:*:*:*:*:*:*:*
cpe:2.3:o:cisco:ios:15.1:*:*:*:*:*:*:*
cpe:2.3:o:cisco:ios_xe:3.2.0s:*:*:*:*:*:*:*
cpe:2.3:o:cisco:ios_xe:3.2.1s:*:*:*:*:*:*:*
cpe:2.3:o:cisco:ios_xe:3.2.2s:*:*:*:*:*:*:*
cpe:2.3:o:cisco:ios_xe:3.3.0s:*:*:*:*:*:*:*
cpe:2.3:o:cisco:ios_xe:3.4.0s:*:*:*:*:*:*:*

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