Description
Asterisk Open Source 1.8.x, 11.x before 11.21.1, 12.x, and 13.x before 13.7.1 and Certified Asterisk 1.8.28, 11.6 before 11.6-cert12, and 13.1 before 13.1-cert3 allow remote authenticated users to cause a denial of service (uninitialized pointer dereference and crash) via a zero length error correcting redundancy packet for a UDPTL FAX packet that is lost.
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 | 1:13.7.2~dfsg-1 | — |
| Debian 8 | asterisk | 1:11.13.1~dfsg-2+deb8u1 | DSA-3700-1 |
Ubuntu
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Ubuntu Pro 16.04 LTS | asterisk | No fix yet | — |
Advisories 1
- DSA-3700-1 asterisk - security update Debian Security (DSA / DLA) · Mar 9, 2026
References
- http://downloads.asterisk.org/pub/security/AST-2016-003.html
- 1034931 vdb-entry
- DSA-3700 vendor-advisory