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CVE-2021-46837

Published: 30 August 2022

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.

Priority

Medium

Cvss 3 Severity Score

6.5

Score breakdown

Status

Package Release Status
asterisk
Launchpad, Ubuntu, Debian
bionic Needs triage

focal Needs triage

jammy Not vulnerable
(1:18.10.0~dfsg+~cs6.10.40431411-2)
kinetic Not vulnerable

lunar Not vulnerable

mantic Not vulnerable

trusty Ignored
(end of standard support)
upstream
Released (1:18.9.0~dfsg+~cs6.10.40431411-1)
xenial Needs triage

Severity score breakdown

Parameter Value
Base score 6.5
Attack vector Network
Attack complexity Low
Privileges required Low
User interaction None
Scope Unchanged
Confidentiality None
Integrity impact None
Availability impact High
Vector CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H