What is CVE-2022-21722?

CVE-2022-21722 is a critical-severity vulnerability in Pjsip Pjproject, classified under Out-of-bounds Read. CVSS score: 9.1/10. Published 2022-01-27.

How severe is CVE-2022-21722?

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

Is CVE-2022-21722 known to be exploited?

1 public proof-of-concept repositories are indexed. Not currently listed in the CISA KEV catalog.

Out-of-bounds Read in Pjsip Pjproject

CVE-2022-21722

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 version 2.11.1 and prior, there are various cases where it is possible that certain incoming RTP/RTCP packets can potentially cause out-of-bound read access. This issue affects all users that use PJMEDIA and accept incoming RTP/RTCP. A patch is available as a 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: 0.023 (83.6th percentile), scored 2026-11-03.

Low probability of exploitation in the next 30 days, but still tracked. 84th percentile — 83.6% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.

EPSS over last 30 days · oldest: 0.023 · newest: 0.023 · change: 0.000

Affected products

Pjsip Pjproject — versions <= 2.11.1
Teluu Pjsip
Debian Linux — versions 9.0, 10.0

Weakness classification (CWE)

CWE-125 — Out-of-bounds Read

Public proof-of-concept exploits

ARPSyndicate/cvemon

References

github.com/pjsip/pjproject/security/advisories/GHSA-m66q-q64c-hv36 (Patch, Third Party Advisory)
github.com/pjsip/pjproject/commit/22af44e68a0c7d190ac1e25075e1382f77e9397a (Patch, 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-2022-21722?: CVE-2022-21722 is a critical-severity vulnerability in Pjsip Pjproject, classified under Out-of-bounds Read. CVSS score: 9.1/10. Published 2022-01-27.
How severe is CVE-2022-21722?: Critical severity. CVSS v3 base score is 9.1 out of 10.
Is CVE-2022-21722 known to be exploited?: 1 public proof-of-concept repositories are indexed. Not currently listed in the CISA KEV catalog.