Description
An issue was discovered in Asterisk through 13.19.1, 14.x through 14.7.5, and 15.x through 15.2.1, and Certified Asterisk through 13.18-cert2. res_pjsip allows remote authenticated users to crash Asterisk (segmentation fault) by sending a number of SIP INVITE messages on a TCP or TLS connection and then suddenly closing the connection.
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 | 1:13.20.0~dfsg-1 | — |
| Debian 9 | asterisk | 1:13.14.1~dfsg-2+deb9u4 | DSA-4320-1 |
Ubuntu
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Ubuntu 18.04 LTS | asterisk | No fix yet | — |
Show 1 more (older releases, extended support, other products)Fewer releases
| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Ubuntu Pro 16.04 LTS | asterisk | No fix yet | — |
Public exploits
Exploit or proof-of-concept code for this vulnerability is publicly available, which lowers the bar for attackers. Treat it as a reason to patch sooner.
Exploit-DB 1
- Asterisk chan_pjsip 15.2.0 - 'INVITE' Denial of Service EDB-44181 · dos · Feb 27, 2018 · verified
Sources: PoC-in-GitHub, Metasploit Framework, Exploit-DB — updated daily. Only links are listed; no exploit code is hosted here.
Advisories 2
- WID-SEC-2026-0838 Asterisk: Schwachstelle ermöglicht Denial of Service BSI CERT-Bund (WID) · Mar 24, 2026
- DSA-4320-1 asterisk - security update Debian Security (DSA / DLA) · Mar 9, 2026
References
- DSA-4320 vendor-advisory
- https://issues.asterisk.org/jira/browse/ASTERISK-27618
- http://downloads.asterisk.org/pub/security/AST-2018-005.html
- 44181 exploit
- 1040417 vdb-entry
- 103129 vdb-entry