CVE-2012-3949

highpriority · track · 32EPSS 0.032 · 88 %ileEURUUS

grimoire priorityP2 · Scheduled

Exploitable?

—

no known exploitation

Likely / severe?

3.20% (88th) EPSS

CVSS 7.8 · high

Is it mine?

279 products

Check your exposure

Who says so?

4 sources

cnnvd · enisa_euvd · fstec_bdu · nvd

EPSS · scored 2026-10-27

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.

cvss

Technical severity, 0–10. One row per scoring source.

7.8

010

base score 0–10 · higher = more severe · hover a vector to decode⚠ sources disagree · medium–high · 6.6–7.8

v2.07.8highAV:N/AC:L/Au:N/C:N/I:N/A:Cprimary · NVD / NIST USexploitability 10 · impact 6.9

v2.07.8highAV:N/AC:L/Au:N/C:N/I:N/A:Csecondary · FSTEC (BDU) RU

v2.06.6mediumAV:N/AC:L/Au:N/C:N/I:N/A:C/E:Usecondary · CVSS-BT (t0sche)

weaknesses

The CWE weakness classes this flaw belongs to.

CWE-20USprimaryCWE-20US

affected products (279)

Products and version ranges known to be affected.

n/a n/a≤ n/aenisa_euvdEU
Cisco Systems Inc. Cisco IOS12.2 → 12.4fstec_bduRU
Cisco Systems Inc. Cisco IOS15.0 → 15.3fstec_bduRU
Cisco Systems Inc. Cisco IOS XE≤ 3.5.1sfstec_bduRU
Cisco Systems Inc. Cisco IOS XE≤ 3.4.xsfstec_bduRU
Cisco Systems Inc. Cisco IOS XE≤ 3.3.1sgfstec_bduRU
Cisco Systems Inc. Cisco IOS XE≤ 3.4.1sfstec_bduRU
Cisco Systems Inc. Cisco IOS XE≤ 3.5.xsfstec_bduRU
Cisco Systems Inc. Cisco IOS XE≤ 3.5.2sfstec_bduRU
Cisco Systems Inc. Cisco IOS XE≤ 3.4.2sfstec_bduRU
Cisco Systems Inc. Cisco IOS XE≤ 3.5.0sfstec_bduRU
Cisco Systems Inc. Cisco IOS XE≤ 3.4.3sfstec_bduRU
Cisco Systems Inc. Cisco IOS XE≤ 3.3.1sfstec_bduRU
Cisco Systems Inc. Cisco IOS XE≤ 3.4.0sfstec_bduRU
Cisco Systems Inc. Cisco IOS XE≤ 3.4.0asfstec_bduRU
Cisco Systems Inc. Cisco IOS XE≤ 3.3.0sgfstec_bduRU
Cisco Systems Inc. Unified Communications Manager6.0 → 7.1(5b)su5fstec_bduRU
Cisco Systems Inc. Unified Communications Manager8.0 → 8.5(1)su4fstec_bduRU
Cisco Systems Inc. Unified Communications Manager8.6 → 8.6(2a)su1fstec_bduRU
cisco ios= 12.2nvdUScpe:2.3:o:cisco:ios:*:*:*:*:*:*:*:*

showing 20 of 279

also known as (8)

Other names and identifiers for this entity.

sources

Which sources assert this record, and when.

cnnvd enisa_euvd fstec_bdu nvd NVD CVE.org MITRE

published 2012-09-27modified 2026-06-16

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+25188 more

references (12)

External citations — patches, advisories, analysis.

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