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    CVE-2021-46837

    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 Certified Asterisk before 16.8-cert7, allows an attacker to trigger a crash by sending an m=image line and zero port in a response to a T.38 re-invite initiated by Asterisk. This is a re-occurrence of the CVE-2019-15297 symptoms but not for exactly the same reason. The crash occurs because there is an append operation relative to the active topology, but this should instead be a replace operation.

    Published:Aug 30, 2022
    Last Modified:Nov 21, 2024
    EPS:Aug 30, 2022
    EPSS Score:0.0004
    CVSS Score:6.5

    Affected Products

    Vendor
    Asterisk
    Product
    Certified Asterisk
    Vendor
    Debian
    Product
    Debian Linux
    Vendor
    Digium
    Product
    Asterisk

    Exploits

    No exploit reference

    Common Weakness Enumeration

    CWE-476 NULL Pointer Dereference

    Common Attack Pattern Enumeration and Classification (CAPEC)

    No CAPEC recorded yet

    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-2022-23608 (CVSS 8.1) — PJSIP is a free and open source multimedia communication library written in C language implementing standard b…
    CVE-2022-21723 (CVSS 9.1) — 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.…

    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