The Asterisk Development Team has announced security releases for
Certified Asterisk 11.6, Asterisk 11, Certified Asterisk 13.8 and
Asterisk 13.
The available security releases are released as versions 11.6-cert15,
11.23.1, 13.8-cert3 and 13.11.1.
These releases are available for immediate download at
The release of these versions resolves the following security
* AST-2016-006: Crash on ACK from unknown endpoint
  Asterisk can be crashed remotely by sending an ACK to it from an
  endpoint username that Asterisk does not recognize. Most SIP request
  types result in an “artificial” endpoint being looked up, but ACKs
  bypass this lookup. The resulting NULL pointer results in a crash
  when attempting to determine if ACLs should be applied.
  This issue was introduced in the Asterisk 13.10 release and only
  affects that release and later releases.
  This issue only affects users using the PJSIP stack with Asterisk.
  Those users that use chan_sip are unaffected.
* AST-2016-007: RTP Resource Exhaustion
 The overlap dialing feature in chan_sip allows chan_sip to report to a
 device that the number that has been dialed is incomplete and more
 digits are required. If this functionality is used with a device that
 has performed username/password authentication RTP resources are
 leaked. This occurs because the code fails to release the old RTP
 resources before allocating new ones in this scenario. If all
 resources are used then RTP port exhaustion will occur and no RTP
 sessions are able to be set up.
For a full list of changes in the current releases, please see the
The security advisories are available at:
Thank you for your continued support of Asterisk!

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