7.5CVSSHIGH
Description
The IAX2 channel driver (chan_iax2) in Asterisk Open 1.2.x before 1.2.23, 1.4.x before 1.4.9, and Asterisk Appliance Developer Kit before 0.6.0, when configured to allow unauthenticated calls, allows remote attackers to cause a denial of service (resource exhaustion) via a flood of calls that do not complete a 3-way handshake, which causes an ast_channel to be allocated but not released.
CVSS Vector Breakdown
Exploitability
AV:NAttack VectorNetwork
AC:LAttack ComplexityLow
PR:NPrivileges RequiredNone
UI:NUser InteractionNone
Scope
S:UScopeUnchanged
Impact
C:NConfidentialityNone
I:NIntegrityNone
A:HAvailabilityHigh
Weaknesses
Affected Products
Exploitability
Official Patch Available
References
http://bugs.gentoo.org/show_bug.cgi?id=185713
bugs.gentoo.org
http://ftp.digium.com/pub/asa/ASA-2007-018.pdf
ftp.digium.com
http://osvdb.org/38197
osvdb.org
and 8 more references View all →
Timeline
Published
Jul 31, 2007
Last Updated
Apr 23, 2026
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