How severe is CVE-2012-3949?

CVE-2012-3949 has a CVSS 2.0 base score of 7.8, rated high severity.

Is CVE-2012-3949 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 3% (87th percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2012-3949?

CVE-2012-3949 primarily affects Cisco Unified Communications Manager. In total, 260 product configurations (CPEs) are listed as vulnerable; see the affected-products list for the exact versions.

How do I fix CVE-2012-3949?

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-2012-3949 published?

CVE-2012-3949 was published on 2012-09-27 and last updated on 2026-06-16.

CVE-2012-3949

CVE-2012-3949 is a high-severity vulnerability in Cisco Unified Communications Manager 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-20.

Key facts

Severity: High (CVSS 2.0 base score 7.8)
EPSS exploit prediction: 3% (87th percentile)
Actively exploited: Not listed in CISA KEV
Weakness: CWE-20
Affected product: Cisco Unified Communications Manager
Published: 2012-09-27
Last modified: 2026-06-16

Description

The SIP implementation in Cisco Unified Communications Manager (CUCM) 6.x and 7.x before 7.1(5b)su5, 8.x before 8.5(1)su4, and 8.6 before 8.6(2a)su1; Cisco IOS 12.2 through 12.4 and 15.0 through 15.2; and Cisco IOS XE 3.3.xSG before 3.3.1SG, 3.4.xS, and 3.5.xS allows remote attackers to cause a denial of service (service crash or device reload) via a crafted SIP message containing an SDP session description, aka Bug IDs CSCtw66721, CSCtj33003, and CSCtw84664.

Frequently asked questions

What is CVE-2012-3949?: The SIP implementation in Cisco Unified Communications Manager (CUCM) 6.x and 7.x before 7.1(5b)su5, 8.x before 8.5(1)su4, and 8.6 before 8.6(2a)su1; Cisco IOS 12.2 through 12.4 and 15.0 through 15.2; and Cisco IOS XE 3.3.xSG before 3.3.1SG, 3.4.xS, and 3.5.xS allows remote attackers to cause a denial of service (service crash or device reload) via a crafted SIP message containing an SDP session description, aka Bug IDs CSCtw66721, CSCtj33003, and CSCtw84664.
How severe is CVE-2012-3949?: CVE-2012-3949 has a CVSS 2.0 base score of 7.8, rated high severity.
Is CVE-2012-3949 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 3% (87th percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2012-3949?: CVE-2012-3949 primarily affects Cisco Unified Communications Manager. In total, 260 product configurations (CPEs) are listed as vulnerable; see the affected-products list for the exact versions.
How do I fix CVE-2012-3949?: 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-2012-3949 published?: CVE-2012-3949 was published on 2012-09-27 and last updated on 2026-06-16.

References

Affected products (260)

cpe:2.3:a:cisco:unified_communications_manager:6.0\(1a\):*:*:*:*:*:*:*
cpe:2.3:a:cisco:unified_communications_manager:6.0\(1b\):*:*:*:*:*:*:*
cpe:2.3:a:cisco:unified_communications_manager:6.1\(1\):*:*:*:*:*:*:*
cpe:2.3:a:cisco:unified_communications_manager:6.1\(1a\):*:*:*:*:*:*:*
cpe:2.3:a:cisco:unified_communications_manager:6.1\(1b\):*:*:*:*:*:*:*
cpe:2.3:a:cisco:unified_communications_manager:6.1\(2\):*:*:*:*:*:*:*
cpe:2.3:a:cisco:unified_communications_manager:6.1\(3\):*:*:*:*:*:*:*
cpe:2.3:a:cisco:unified_communications_manager:6.1\(3a\):*:*:*:*:*:*:*
cpe:2.3:a:cisco:unified_communications_manager:6.1\(3b\):*:*:*:*:*:*:*
cpe:2.3:a:cisco:unified_communications_manager:6.1\(4\):*:*:*:*:*:*:*
cpe:2.3:a:cisco:unified_communications_manager:6.1\(4a\):*:*:*:*:*:*:*
cpe:2.3:a:cisco:unified_communications_manager:6.1\(4b\):*:*:*:*:*:*:*
cpe:2.3:a:cisco:unified_communications_manager:6.1\(5\):*:*:*:*:*:*:*
cpe:2.3:a:cisco:unified_communications_manager:7.1\(1\):*:*:*:*:*:*:*
cpe:2.3:a:cisco:unified_communications_manager:7.1\(2\):*:*:*:*:*:*:*
cpe:2.3:a:cisco:unified_communications_manager:7.1\(2a\):*:*:*:*:*:*:*
cpe:2.3:a:cisco:unified_communications_manager:7.1\(2b\):*:*:*:*:*:*:*
cpe:2.3:a:cisco:unified_communications_manager:7.1\(3\):*:*:*:*:*:*:*
cpe:2.3:a:cisco:unified_communications_manager:7.1\(3a\):*:*:*:*:*:*:*
cpe:2.3:a:cisco:unified_communications_manager:7.1\(3b\):*:*:*:*:*:*:*
cpe:2.3:a:cisco:unified_communications_manager:7.1\(5\):*:*:*:*:*:*:*
cpe:2.3:a:cisco:unified_communications_manager:7.1\(5a\):*:*:*:*:*:*:*
cpe:2.3:a:cisco:unified_communications_manager:7.1\(5b\):*:*:*:*:*:*:*
cpe:2.3:a:cisco:unified_communications_manager:7.1\(5b\)su1:*:*:*:*:*:*:*
cpe:2.3:a:cisco:unified_communications_manager:7.1\(5b\)su1a:*:*:*:*:*:*:*
cpe:2.3:a:cisco:unified_communications_manager:7.1\(5b\)su2:*:*:*:*:*:*:*
cpe:2.3:a:cisco:unified_communications_manager:7.1\(5b\)su3:*:*:*:*:*:*:*
cpe:2.3:a:cisco:unified_communications_manager:7.1\(5b\)su4:*:*:*:*:*:*:*
cpe:2.3:a:cisco:unified_communications_manager:8.0:*:*:*:*:*:*:*
cpe:2.3:a:cisco:unified_communications_manager:8.0\(1\):*:*:*:*:*:*:*
cpe:2.3:a:cisco:unified_communications_manager:8.0\(2\):*:*:*:*:*:*:*
cpe:2.3:a:cisco:unified_communications_manager:8.0\(2a\):*:*:*:*:*:*:*
cpe:2.3:a:cisco:unified_communications_manager:8.0\(2b\):*:*:*:*:*:*:*
cpe:2.3:a:cisco:unified_communications_manager:8.0\(2c\):*:*:*:*:*:*:*
cpe:2.3:a:cisco:unified_communications_manager:8.0\(3\):*:*:*:*:*:*:*
cpe:2.3:a:cisco:unified_communications_manager:8.0\(3a\):*:*:*:*:*:*:*
cpe:2.3:a:cisco:unified_communications_manager:8.5\(1\)su1:*:*:*:*:*:*:*
cpe:2.3:a:cisco:unified_communications_manager:8.5\(1\)su2:*:*:*:*:*:*:*
cpe:2.3:a:cisco:unified_communications_manager:8.5\(1\)su3:*:*:*:*:*:*:*
cpe:2.3:o:cisco:ios:12.2:*:*:*:*:*:*:*

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