CVE-2021-26906

Name	CVE-2021-26906
Description	An issue was discovered in res_pjsip_session.c in Digium Asterisk through 13.38.1; 14.x, 15.x, and 16.x through 16.16.0; 17.x through 17.9.1; and 18.x through 18.2.0, and Certified Asterisk through 16.8-cert5. An SDP negotiation vulnerability in PJSIP allows a remote server to potentially crash Asterisk by sending specific SIP responses that cause an SDP negotiation failure.
Source	CVE (at NVD; CERT, LWN, oss-sec, fulldisc, Red Hat, Ubuntu, Gentoo, SUSE bugzilla/CVE, GitHub advisories/code/issues, web search, more)
Debian Bugs	983159

Vulnerable and fixed packages

The table below lists information on source packages.

Source Package	Release	Version	Status
asterisk (PTS)	bullseye (security), bullseye	1:16.28.0~dfsg-0+deb11u4	fixed
	sid	1:20.8.1~dfsg+~cs6.14.40431414-1	fixed

The information below is based on the following data on fixed versions.

Package	Type	Release	Fixed Version	Urgency	Origin	Debian Bugs
asterisk	source	(unstable)	1:16.16.1~dfsg-1			983159

Notes

[buster] - asterisk <postponed> (Minor issue)
[stretch] - asterisk <no-dsa> (Minor issue)
https://downloads.asterisk.org/pub/security/AST-2021-005.html
https://issues.asterisk.org/jira/browse/ASTERISK-29196