Cisco IOS Software Session Initiation Protocol Denial of Service Vulnerabilities (cisco-sa-20110928-sip)

high Nessus Plugin ID 56319
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The remote device is missing a vendor-supplied security patch.


Multiple vulnerabilities exist 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 a reload of an affected device or trigger memory leaks that may result in system instabilities. Affected devices would need to be configured to process SIP messages for these vulnerabilities to be exploitable.
Cisco has released free software updates that address these vulnerabilities. There are no workarounds for devices that must run SIP; however, mitigations are available to limit exposure to the vulnerabilities.


Apply the relevant patch referenced in Cisco Security Advisory cisco-sa-20110928-sip.

See Also

Plugin Details

Severity: High

ID: 56319

File Name: cisco-sa-20110928-siphttp.nasl

Version: 1.19

Type: local

Family: CISCO

Published: 9/29/2011

Updated: 11/15/2018

Dependencies: cisco_ios_version.nasl

Risk Information


Risk Factor: Low

Score: 3.6


Risk Factor: High

Base Score: 7.8

Vector: CVSS2#AV:N/AC:L/Au:N/C:N/I:N/A:C

Vulnerability Information

CPE: cpe:2.3:o:cisco:ios:*:*:*:*:*:*:*:*

Required KB Items: Host/Cisco/IOS/Version

Patch Publication Date: 9/21/2012

Vulnerability Publication Date: 9/28/2011

Reference Information

CVE: CVE-2011-0939, CVE-2011-2072, CVE-2011-3275