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Category:   Application (VoIP)  >   Asterisk Vendors:   Digium (Linux Support Services)
Asterisk Bug in Processing SIP Packets Lets Remote Users Deny Service
SecurityTracker Alert ID:  1022705
SecurityTracker URL:
CVE Reference:   CVE-2009-2726   (Links to External Site)
Date:  Aug 11 2009
Impact:   Denial of service via network
Fix Available:  Yes  Vendor Confirmed:  Yes  
Version(s): 1.6.1 prior to; previous releases also affected.
Description:   A vulnerability was reported in Asterisk. A remote user can cause denial of service conditions.

A remote user can send specially crafted SIP packets to cause the target service to consume all available stack memory for the SIP network thread and crash.

The flaw is only exploitable in version 1.6.1 and later.

Nick Baggott of Mu Dynamics reported this vulnerability.

Impact:   A remote user can cause the target service to crash.
Solution:   The vendor has issued a fix (1.2.34,,,

The vendor's advisory is available at:

Vendor URL: (Links to External Site)
Cause:   Resource error
Underlying OS:  Linux (Any), UNIX (Any), Windows (Any)

Message History:   None.

 Source Message Contents

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