Asterisk Project Security Advisory – AST-2020-003

Asterisk Project Security Advisory – AST-2020-003

Product Asterisk
Summary Remote crash in res_pjsip_diversion
Nature of Advisory Denial of service
Susceptibility Remote authenticated sessions
Severity Moderate
Exploits Known Yes
Reported On December 22, 2020
Reported By Torrey Searle
Posted On December 22, 2020
Last Updated On December 22, 2020
Advisory Contact kharwell AT sangoma DOT com
CVE Name

Description A crash can occur in Asterisk when a SIP message is
received that has a History-Info header, which
contains a tel-uri.

Note, the remote client must be authenticated, or
Asterisk must be configured for anonymous calling in
order for this problem to manifest.
Modules Affected res_pjsip_diversion.c

Resolution Asterisk now ensures that if it receives a SIP message with
a History-Info header that contains a tel-uri the
redirecting cause is simply set to unknown.

Affected Versions
Product Release Series
Asterisk Open Source 13.X 13.38.0
Asterisk Open Source 16.X 16.15.0
Asterisk Open Source 17.X 17.9.0
Asterisk Open Source 18.X 18.1.0

Corrected In
Product Release
Asterisk Open Source 13.38.1, 16.15.1, 17.9.1, 18.1.1

SVN URL Revision Asterisk
13 Asterisk
16 Asterisk
17 Asterisk


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Revision History
Date Editor Revisions Made
December 22, 2020 Kevin Harwell Initial revision

Asterisk Project Security Advisory – AST-2020-003
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Permission is hereby granted to distribute and publish this advisory in its
original, unaltered form.