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CVE-2021-26717

Published: 18 February 2021

An issue was discovered in Sangoma Asterisk 16.x before 16.16.1, 17.x before 17.9.2, and 18.x before 18.2.1 and Certified Asterisk before 16.8-cert6. When re-negotiating for T.38, if the initial remote response was delayed just enough, Asterisk would send both audio and T.38 in the SDP. If this happened, and the remote responded with a declined T.38 stream, then Asterisk would crash.

Notes

AuthorNote
sbeattie
introduced in 16.15.0 upstream

Priority

Medium

Cvss 3 Severity Score

7.5

Score breakdown

Status

Package Release Status
asterisk
Launchpad, Ubuntu, Debian
bionic Not vulnerable
(code not present)
focal Not vulnerable
(code not present)
groovy Not vulnerable
(code not present)
jammy Needed

trusty Does not exist

xenial Not vulnerable
(code not present)
hirsute Ignored
(end of life)
upstream
Released (16.16.1,17.9.2,18.2.1)
kinetic Ignored
(end of life, was needed)
impish Ignored
(end of life)
mantic Needed

lunar Ignored
(end of life, was needed)

Severity score breakdown

Parameter Value
Base score 7.5
Attack vector Network
Attack complexity Low
Privileges required None
User interaction None
Scope Unchanged
Confidentiality None
Integrity impact None
Availability impact High
Vector CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H