CVE-2022-21723: Asterisk Certified Asterisk

Critical severity, CVSS 9.1. EPSS: 4.4% 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 2.11.1 and prior, parsing an incoming SIP message that contains a malformed multipart can potentially cause out-of-bound read access. This issue affects all PJSIP users that accept SIP multipart. The patch is available as commit in the `master` branch. There are no known workarounds.

Affected products

• Asterisk Certified Asterisk: 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 2022-01-27. Last modified 2026-06-17.