Cyber Resilience

CVE-2022-21723

CriticalPublic PoC

Published: 27 January 2022

Published
27 January 2022
Modified
04 November 2025
KEV Added
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Patch
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CVSS Score v3.1 9.1 CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:H
EPSS Score 0.0047 65.0th percentile
Risk Priority 18 60% EPSS · 20% KEV · 20% CVSS

Summary

CVE-2022-21723 is a critical-severity Out-of-bounds Read (CWE-125) vulnerability in Asterisk Certified Asterisk. Its CVSS base score is 9.1 (Critical).

Operationally, ranked in the top 35.0% of CVEs by exploit likelihood; it is not currently listed in the CISA KEV catalog; a public proof-of-concept is referenced.

EU & UK References

Vulnerability details

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…

more

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.

CWE(s)
CWE-125

Related Threats

No named actor attribution yet. ATT&CK technique mapping in progress for this CVE.

Affected Assets

teluu
pjsip
≤ 2.11.1
asterisk
certified asterisk
16.8.0
sangoma
asterisk
16.0.0 — 16.24.1 · 18.0.0 — 18.10.1 · 19.0.0 — 19.2.1
debian
debian linux
10.0, 9.0

Mitigating Controls

No mitigating controls mapped yet. The per-CVE control annotator has not reached this CVE.

References