CVE-2022-23608: Asterisk Certified Asterisk

Critical severity, CVSS 9.8. EPSS: 4% chance of exploitation in the next 30 days.

PJSIP is a free and open source multimedia communication library written in C language implementing standard based protocols such as SIP, SDP, RTP, STUN, TURN, and ICE. In versions up to and including 2.11.1 when in a dialog set (or forking) scenario, a hash key shared by multiple UAC dialogs can potentially be prematurely freed when one of the dialogs is destroyed . The issue may cause a dialog set to be registered in the hash table multiple times (with different hash keys) leading to undefined behavior such as dialog list collision which eventually leading to endless loop. A patch is available in commit db3235953baa56d2fb0e276ca510fefca751643f which will be included in the next release. There are no known workarounds for this issue.

Affected products

• Asterisk Certified Asterisk: before 16.8.0 (fixed in 16.8.0); version 16.8.0 only
• Debian Debian Linux: version 9.0 only; version 10.0 only
• Sangoma Asterisk: from 16.0.0, before 16.24.1 (fixed in 16.24.1); from 18.0.0, before 18.10.1 (fixed in 18.10.1); from 19.0.0, before 19.2.1 (fixed in 19.2.1)
• Teluu Pjsip: up to and including 2.11.1

Published 2022-02-22. Last modified 2026-06-17.