Vulnerability · Published Aug 30, 2022 · Assigned by mitre
CVE-2021-46837
Medium 6.5
In plain English
A medium-severity security flaw in the asterisk package (Debian). There are no confirmed reports of exploitation so far. The chance it is exploited in the next 30 days is estimated at 4.7% (higher than 92% of all known vulnerabilities). Fixed versions are available - upgrade the affected package.
Official description
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.
Affected packages & fixed versions
| Ecosystem | Package | Fixed in | Advisory |
|---|---|---|---|
| Debian:14 | asterisk | 1:18.9.0~dfsg+~cs6.10.40431411-1 | DEBIAN-CVE-2021-46837 |