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.

• CWE-476

• https://downloads.asterisk.org/pub/security/AST-2021-006.htmlVendor Advisory
• https://lists.debian.org/debian-lts-announce/2022/11/msg00021.htmlMailing List, Third Party Advisory
• https://www.debian.org/security/2022/dsa-5285Third Party Advisory
• https://downloads.asterisk.org/pub/security/AST-2021-006.htmlVendor Advisory
• https://lists.debian.org/debian-lts-announce/2022/11/msg00021.htmlMailing List, Third Party Advisory
• https://www.debian.org/security/2022/dsa-5285Third Party Advisory

Published

Aug 30, 2022

Last Modified

Jun 17, 2026

Status

Modified

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