Cisco IOS Software Session Initiation Protocol Denial of Service Vulnerability (cisco-sa-20120926-sip)

high Nessus Plugin ID 62376


The remote device is missing a vendor-supplied security patch.


A vulnerability exists in the Session Initiation Protocol (SIP) implementation in Cisco IOS Software and Cisco IOS XE Software that could allow an unauthenticated, remote attacker to cause an affected device to reload. Affected devices must be configured to process SIP messages and for pass-through of Session Description Protocol (SDP) for this vulnerability to be exploitable. Cisco has released free software updates that address this vulnerability. There are no workarounds for devices that must run SIP; however, mitigations are available to limit exposure to the vulnerability.


Apply the relevant patch referenced in Cisco Security Advisory cisco-sa-20120926-sip.

See Also

Plugin Details

Severity: High

ID: 62376

File Name: cisco-sa-20120926-sip.nasl

Version: 1.18

Type: combined

Family: CISCO

Published: 9/28/2012

Updated: 11/15/2018

Risk Information


Risk Factor: Low

Score: 3.4


Risk Factor: High

Base Score: 7.8

Temporal Score: 5.8

Vector: AV:N/AC:L/Au:N/C:N/I:N/A:C

Temporal Vector: E:U/RL:OF/RC:C

Vulnerability Information

CPE: cpe:/o:cisco:ios

Required KB Items: Host/Cisco/IOS/Version

Exploit Ease: No known exploits are available

Patch Publication Date: 10/3/2012

Vulnerability Publication Date: 9/26/2012

Reference Information

CVE: CVE-2012-3949

BID: 55697


CISCO-SA: cisco-sa-20120926-sip