What is CVE-2022-21723?

CVE-2022-21723 is a critical-severity vulnerability in Asterisk Certified, classified under Out-of-bounds Read. CVSS score: 9.1/10. Published 2022-01-27.

How severe is CVE-2022-21723?

Critical severity. CVSS v3 base score is 9.1 out of 10.

Out-of-bounds Read in Asterisk Certified

CVE-2022-21723

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.

Vulnerability class: Buffer Overflow

Published 2022-01-27 · last modified 2026-06-17.

CVSS v3 metric

CVSS v3 base score 9.1 (Critical). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:H.

EPSS exploit prediction

EPSS: 0.044 (91.2th percentile), scored 2026-11-03.

Low probability of exploitation in the next 30 days, but still tracked. 91st percentile — 91.2% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.

EPSS over last 30 days · oldest: 0.044 · newest: 0.044 · change: 0.000

Affected products

Asterisk Certified — versions 16.8.0
Pjsip Pjproject — versions <= 2.11.1
Sangoma Asterisk
Teluu Pjsip
Debian Linux — versions 9.0, 10.0

Weakness classification (CWE)

CWE-125 — Out-of-bounds Read

References

github.com/pjsip/pjproject/security/advisories/GHSA-7fw8-54cv-r7pm (Patch, Third Party Advisory)
github.com/pjsip/pjproject/commit/077b465c33f0aec05a49cd2ca456f9a1b112e896 (Patch, Third Party Advisory)
seclists.org/fulldisclosure/2022/Mar/2 (mailing-list, Patch, Mailing List, Third Party Advisory)
packetstormsecurity.com/files/166227/Asterisk-Project-Security-Advisory-AST-202… (VDB Entry, Third Party Advisory)
lists.debian.org/debian-lts-announce/2022/03/msg00035.html (mailing-list, Mailing List, Third Party Advisory)
security.gentoo.org/glsa/202210-37 (vendor-advisory, Third Party Advisory)
lists.debian.org/debian-lts-announce/2022/11/msg00021.html (mailing-list, Mailing List, Third Party Advisory)
www.debian.org/security/2022/dsa-5285 (vendor-advisory, Third Party Advisory)
lists.debian.org/debian-lts-announce/2023/08/msg00038.html (mailing-list)
af854a3a-2127-422b-91ae-364da2661108

Frequently asked questions

What is CVE-2022-21723?: CVE-2022-21723 is a critical-severity vulnerability in Asterisk Certified, classified under Out-of-bounds Read. CVSS score: 9.1/10. Published 2022-01-27.
How severe is CVE-2022-21723?: Critical severity. CVSS v3 base score is 9.1 out of 10.