CVE-2022-21723 | Out-of-bounds read in multipart parsing in PJSIP

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.

Published: 2022-01-27 Last update: 2025-11-04 Assigner: [email protected] Source: [email protected]
NVD Status：Modified，CVE State: published
View at NVD, CVE.org, EUVD

CVE-2022-21723 is rated Moderate Risk (58.6/100): CVSS Critical severity, with medium exploitation likelihood (EPSS 0.47%). Review affected assets and schedule remediation.

Risk is dynamic; we continuously reassess and refresh what is shown on this page as upstream context changes.

Exploit prediction scoring system (EPSS) score for CVE-2022-21723

EPSS lead: Daily EPSS estimates relative likelihood of exploitation; percentile ranks this CVE among scored vulnerabilities (higher = more severe relative rank).

# Date Old EPSS score New EPSS score Delta (New - Old)
1 2026-01-16 0.72% 0.47% -0.25%
2 2025-12-28 0.60% 0.72% +0.11%
3 2025-12-27 — 0.60% —

Full EPSS history (23 records total)

Common vulnerability scoring system (CVSS) metrics for CVE-2022-21723

CVSS metrics for this CVE.

Base score Version Severity Vector Exploitability Impact Score source
9.1 3.1 CRITICAL
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:H Click to expand
Attack vector (AV:N)
Could be attacked over the internet or any normal routed network—not just someone sitting at the machine.
Attack complexity (AC:L)
Once they can reach the bug, pulling it off is straightforward—no weird race conditions or rare setup.
Privileges required (PR:N)
No account or special rights needed—anonymous or random user is enough.
User interaction (UI:N)
Nobody has to click “OK” or open a trap file; it can work without a victim helping.
Scope (S:U)
Damage stays in the same “trust bubble” as the broken component—no big spill into unrelated systems.
Confidentiality (C:H)
Serious risk that confidential data gets exposed in a big way.
Integrity (I:N)
Data isn’t meaningfully altered or forged.
Availability (A:H)
Could take the service down hard or make it unusable for people who depend on it.
 3.9 5.2 [email protected]
9.1 3.1 CRITICAL
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:H Click to expand
Attack vector (AV:N)
Could be attacked over the internet or any normal routed network—not just someone sitting at the machine.
Attack complexity (AC:L)
Once they can reach the bug, pulling it off is straightforward—no weird race conditions or rare setup.
Privileges required (PR:N)
No account or special rights needed—anonymous or random user is enough.
User interaction (UI:N)
Nobody has to click “OK” or open a trap file; it can work without a victim helping.
Scope (S:U)
Damage stays in the same “trust bubble” as the broken component—no big spill into unrelated systems.
Confidentiality (C:H)
Serious risk that confidential data gets exposed in a big way.
Integrity (I:N)
Data isn’t meaningfully altered or forged.
Availability (A:H)
Could take the service down hard or make it unusable for people who depend on it.
 3.9 5.2 [email protected]
6.4 2.0 MEDIUM
AV:N/AC:L/Au:N/C:P/I:N/A:P Click to expand
Access vector (AV:N)
Can be exploited remotely over network reachability.
Access complexity (AC:L)
Exploitation conditions are straightforward and predictable.
Authentication (AU:N)
No authentication is required.
Confidentiality impact (C:P)
Partial confidentiality impact.
Integrity impact (I:N)
No integrity impact.
Availability impact (A:P)
Partial availability impact.
 10.0 4.9 [email protected]

Weakness enumeration for CVE-2022-21723

OS Trackers for CVE-2022-21723

vendor priority summary link
alpine critical CVE-2022-21723: 1 source package rows (pjproject); 17 state rows across 7 repos (3.17-main, 3.18-main, 3.19-main, 3.20-main, 3.21-main, 3.22-main, edge-main); fixed 7, open 10. https://security.alpinelinux.org/vuln/CVE-2022-21723
debian not yet assigned CVE-2022-21723 not yet assigned priority: Debian including 2 source packages (asterisk, ring), 4 status rows across 3 suites (bookworm, bullseye, sid): resolved 4. https://security-tracker.debian.org/tracker/CVE-2022-21723
gentoo normal CVE-2022-21723: 1 GLSA(s) (202210-37), 1 atom(s) (net-libs/pjproject); latest impact normal. https://bugs.gentoo.org/buglist.cgi?quicksearch=CVE-2022-21723
ubuntu medium CVE-2022-21723 medium priority: Ubuntu including 2 source packages (pjproject, ring), 16 status rows across 12 suites (bionic, focal, impish, lunar, mantic, noble, oracular, plucky, questing, trusty, upstream, xenial): DNE 4, ignored 4, released 3, needed 2, not-affected 2, needs-triage 1. https://ubuntu.com/security/CVE-2022-21723

Affected software / configurations for CVE-2022-21723

Vendor Product Version Raw CPE
teluu pjsip <= 2.11.1 cpe:2.3:a:teluu:pjsip:*:*:*:*:*:*:*:*
asterisk certified_asterisk 16.8.0 cpe:2.3:a:asterisk:certified_asterisk:16.8.0:*:*:*:*:*:*:*
asterisk certified_asterisk 16.8.0 cpe:2.3:a:asterisk:certified_asterisk:16.8.0:cert1:*:*:*:*:*:*
asterisk certified_asterisk 16.8.0 cpe:2.3:a:asterisk:certified_asterisk:16.8.0:cert10:*:*:*:*:*:*
asterisk certified_asterisk 16.8.0 cpe:2.3:a:asterisk:certified_asterisk:16.8.0:cert11:*:*:*:*:*:*
asterisk certified_asterisk 16.8.0 cpe:2.3:a:asterisk:certified_asterisk:16.8.0:cert12:*:*:*:*:*:*
asterisk certified_asterisk 16.8.0 cpe:2.3:a:asterisk:certified_asterisk:16.8.0:cert2:*:*:*:*:*:*
asterisk certified_asterisk 16.8.0 cpe:2.3:a:asterisk:certified_asterisk:16.8.0:cert3:*:*:*:*:*:*
asterisk certified_asterisk 16.8.0 cpe:2.3:a:asterisk:certified_asterisk:16.8.0:cert4:*:*:*:*:*:*
asterisk certified_asterisk 16.8.0 cpe:2.3:a:asterisk:certified_asterisk:16.8.0:cert5:*:*:*:*:*:*
asterisk certified_asterisk 16.8.0 cpe:2.3:a:asterisk:certified_asterisk:16.8.0:cert6:*:*:*:*:*:*
asterisk certified_asterisk 16.8.0 cpe:2.3:a:asterisk:certified_asterisk:16.8.0:cert7:*:*:*:*:*:*
asterisk certified_asterisk 16.8.0 cpe:2.3:a:asterisk:certified_asterisk:16.8.0:cert8:*:*:*:*:*:*
asterisk certified_asterisk 16.8.0 cpe:2.3:a:asterisk:certified_asterisk:16.8.0:cert9:*:*:*:*:*:*
sangoma asterisk >= 16.0.0, < 16.24.1 cpe:2.3:a:sangoma:asterisk:*:*:*:*:*:*:*:*
sangoma asterisk >= 18.0.0, < 18.10.1 cpe:2.3:a:sangoma:asterisk:*:*:*:*:*:*:*:*
sangoma asterisk >= 19.0.0, < 19.2.1 cpe:2.3:a:sangoma:asterisk:*:*:*:*:*:*:*:*
debian debian_linux 9.0 cpe:2.3:o:debian:debian_linux:9.0:*:*:*:*:*:*:*
debian debian_linux 10.0 cpe:2.3:o:debian:debian_linux:10.0:*:*:*:*:*:*:*

References for CVE-2022-21723

URL Tags
http://packetstormsecurity.com/files/166227/Asterisk-Project-Security-Advisory-AST-2022-006.html Third Party Advisory VDB Entry
http://seclists.org/fulldisclosure/2022/Mar/2 Mailing List Patch Third Party Advisory
https://github.com/pjsip/pjproject/commit/077b465c33f0aec05a49cd2ca456f9a1b112e896 Patch Third Party Advisory
https://github.com/pjsip/pjproject/security/advisories/GHSA-7fw8-54cv-r7pm Patch Third Party Advisory
https://lists.debian.org/debian-lts-announce/2022/03/msg00035.html Mailing List Third Party Advisory
https://lists.debian.org/debian-lts-announce/2022/11/msg00021.html Mailing List Third Party Advisory
https://lists.debian.org/debian-lts-announce/2023/08/msg00038.html
https://security.gentoo.org/glsa/202210-37 Third Party Advisory
https://www.debian.org/security/2022/dsa-5285 Third Party Advisory
https://lists.debian.org/debian-lts-announce/2024/09/msg00030.html
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