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    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.

    Published:Jan 27, 2022
    Last Modified:Nov 4, 2025
    EPS:Jan 27, 2022
    EPSS Score:0.00528
    CVSS Score:9.1

    Affected Products

    Vendor
    Asterisk
    Product
    Certified Asterisk
    Vendor
    Debian
    Product
    Debian Linux
    Vendor
    Sangoma
    Product
    Asterisk
    Vendor
    Teluu
    Product
    Pjsip

    Exploits

    No exploit reference

    Common Weakness Enumeration

    CWE-125 Out-of-bounds Read

    Common Attack Pattern Enumeration and Classification (CAPEC)

    CAPEC-540 Overread Buffers

    Related CVEs

    CVE-2025-47780 (CVSS 4.8) — Asterisk is an open-source private branch exchange (PBX). Prior to versions 18.26.2, 20.14.1, 21.9.1, and 22.4…
    CVE-2025-47779 (CVSS 7.7) — Asterisk is an open-source private branch exchange (PBX). Prior to versions 18.26.2, 20.14.1, 21.9.1, and 22.4…
    CVE-2024-42365 (CVSS 7.4) — Asterisk is an open source private branch exchange (PBX) and telephony toolkit. Prior to asterisk versions 18.…
    CVE-2021-46837 (CVSS 6.5) — res_pjsip_t38 in Sangoma Asterisk 16.x before 16.16.2, 17.x before 17.9.3, and 18.x before 18.2.2, and Certifi…
    CVE-2022-23608 (CVSS 8.1) — PJSIP is a free and open source multimedia communication library written in C language implementing standard b…
    CVE-2021-37706 (CVSS 7.3) — PJSIP is a free and open source multimedia communication library written in C language implementing standard b…
    CVE-2020-28242 (CVSS 6.5) — An issue was discovered in Asterisk Open Source 13.x before 13.37.1, 16.x before 16.14.1, 17.x before 17.8.1, …
    CVE-2017-9358 (CVSS 7.5) — A memory exhaustion vulnerability exists in Asterisk Open Source 13.x before 13.15.1 and 14.x before 14.4.1 an…
    CVE-2013-2686 (CVSS 5) — main/http.c in the HTTP server in Asterisk Open Source 1.8.x before 1.8.20.2, 10.x before 10.12.2, and 11.x be…
    CVE-2013-2264 (CVSS 5) — The SIP channel driver in Asterisk Open Source 1.8.x before 1.8.20.2, 10.x before 10.12.2, and 11.x before 11.…

    References

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

    Common Vulnerability Scoring System

    Attack Vector
    Network
    Adjacent
    Local
    Physical
    Privileges Required
    None
    Low
    High
    User Interaction
    None
    Required
    Scope
    Unchanged
    Changed
    Confidentiality
    None
    Low
    High
    Integrity
    None
    Low
    High
    Availability
    None
    Low
    High