Executive Summary

Title Cisco Unified Communications Manager IM and Presence Service SIP Packet Processing Denial of Service Vulnerability
Name cisco-sa-20160803-ucm First vendor Publication 2016-08-03
Vendor Cisco Last vendor Modification 2016-08-03
Severity (Vendor) N/A Revision 1.0

Security-Database Scoring CVSS v3

Cvss vector : N/A
Overall CVSS Score NA
Base Score NA Environmental Score NA
impact SubScore NA Temporal Score NA
Exploitabality Sub Score NA
Calculate full CVSS 3.0 Vectors scores

Security-Database Scoring CVSS v2

Cvss vector : (AV:N/AC:L/Au:N/C:N/I:N/A:C)
Cvss Base Score 7.8 Attack Range Network
Cvss Impact Score 6.9 Attack Complexity Low
Cvss Expoit Score 10 Authentication None Required
Calculate full CVSS 2.0 Vectors scores


A vulnerability in Session Initiation Protocol (SIP) processing functions of the Cisco Unified Communications Manager Instant Messaging (IM) and Presence Service could allow an unauthenticated, remote attacker to cause the Cisco SIP Proxy Daemon (sipd) process to restart unexpectedly, resulting in a denial of service (DoS) condition on a targeted system.

The vulnerability is due to improper input validation of SIP packet headers. An attacker could exploit this vulnerability by sending a crafted SIP packet to a targeted system. A successful exploit could allow the attacker to cause the sipd process to restart unexpectedly, resulting in a DoS condition on the system. If the sipd process restarts repeatedly, a successful exploit could also result in a sustained DoS condition and cause high disk utilization due to a large number of sipd core files being written to disk, which could exacerbate the DoS condition.

Cisco has released software updates that address this vulnerability. There are no workarounds that address this vulnerability.

This advisory is available at the following link:


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Original Source

Url : http://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco (...)

CWE : Common Weakness Enumeration

% Id Name
100 % CWE-399 Resource Management Errors

CPE : Common Platform Enumeration

Application 4

Snort® IPS/IDS

Date Description
2016-08-04 Cisco Unified Communications Manager null pointer dereference attempt
RuleID : 39797 - Revision : 1 - Type : PROTOCOL-VOIP
2016-08-04 Cisco Unified Communications Manager null pointer dereference attempt
RuleID : 39796 - Revision : 1 - Type : PROTOCOL-VOIP

Alert History

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Date Informations
2016-08-11 21:24:54
  • Multiple Updates
2016-08-08 09:25:32
  • Multiple Updates
2016-08-03 21:23:49
  • First insertion