Description
Asterisk Open Source 11.x before 11.12.1 and 12.x before 12.5.1 and Certified Asterisk 11.6 before 11.6-cert6, when using the res_fax_spandsp module, allows remote authenticated users to cause a denial of service (crash) via an out of call message, which is not properly handled in the ReceiveFax dialplan application.
Fixed in Linux distributions
Distributions backport fixes, so the version that fixes this vulnerability differs per release — upgrade to at least the version shown. From the distributions' security trackers and advisories.
Debian
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Debian 14 | asterisk | 1:11.12.1~dfsg-1 | — |
| Debian 7 | asterisk | 1:1.8.13.1~dfsg1-3+deb7u4 | DLA-455-1 |
Advisories 1
- DLA-455-1 asterisk - security update Debian Security (DSA / DLA) · Mar 9, 2026