Description
PJSIP is a free and open source multimedia communication library written in C language implementing standard based protocols such as SIP, SDP, RTP, STUN, TURN, and ICE. In affected versions if the incoming STUN message contains an ERROR-CODE attribute, the header length is not checked before performing a subtraction operation, potentially resulting in an integer underflow scenario. This issue affects all users that use STUN. A malicious actor located within the victim’s network may forge and send a specially crafted UDP (STUN) message that could remotely execute arbitrary code on the victim’s machine. Users are advised to upgrade as soon as possible. There are no known workarounds.
Affected products
| Vendor | Product | Affected | Fixed |
|---|---|---|---|
| pjsip | pjproject | <= 2.11.1 | — |
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 | 1:18.10.1~dfsg+~cs6.10.40431411-1 | — |
| Debian 12 | ring | 20230206.0~ds1-1 | — |
| Debian 11 | asterisk | 1:16.28.0~dfsg-0+deb11u1 | DSA-5285-1 |
| Debian 11 | ring | 20210112.2.b757bac~ds1-1+deb11u1 | DLA-3887-1 |
| Debian 10 | asterisk | 1:16.28.0~dfsg-0+deb10u1 | DLA-3194-1 |
| Debian 10 | ring | 20190215.1.f152c98~ds1-1+deb10u2 | DLA-3549-1 |
| Debian 9 | pjproject | 2.5.5~dfsg-6+deb9u3 | DLA-2962-1 |
Ubuntu
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Ubuntu 20.04 LTS | ring | 20190215.1.f152c98~ds1-1+deb10u2build0.20.04.1 | USN-6422-1 |
Show 2 more (older releases, extended support, other products)Fewer releases
| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Ubuntu Pro 18.04 LTS | pjproject | 2.7.2~dfsg-1ubuntu0.1~esm1 | — |
| Ubuntu Pro 18.04 LTS | ring | 20180228.1.503da2b~ds1-1ubuntu0.1~esm1 | USN-6422-1 |
| Ubuntu Pro 16.04 LTS | pjproject | 2.1.0.0.ast20130823-1+deb8u1ubuntu0.1~esm1 | — |
Alpine
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Alpine v3.24 | pjproject | 2.12-r0 | — |
| Alpine v3.23 | pjproject | 2.12-r0 | — |
| Alpine v3.22 | pjproject | 2.12-r0 | — |
| Alpine v3.21 | pjproject | 2.12-r0 | — |
| Alpine v3.20 | pjproject | 2.12-r0 | — |
Show 4 more (older releases, extended support, other products)Fewer releases
| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Alpine v3.19 | pjproject | 2.12-r0 | — |
| Alpine v3.18 | pjproject | 2.12-r0 | — |
| Alpine v3.17 | pjproject | 2.12-r0 | — |
| Alpine v3.16 | pjproject | 2.12-r0 | — |
Advisories 7
- USN-6422-1 ring vulnerabilities Ubuntu Security Notices (USN) · Apr 27, 2026
- WID-SEC-2022-2108 Asterisk: Mehrere Schwachstellen BSI CERT-Bund (WID) · Mar 24, 2026
- DSA-5285-1 asterisk - security update Debian Security (DSA / DLA) · Mar 9, 2026
- DLA-3887-1 ring - security update Debian Security (DSA / DLA) · Mar 9, 2026
- DLA-2962-1 pjproject - security update Debian Security (DSA / DLA) · Mar 9, 2026
- DLA-3194-1 asterisk - security update Debian Security (DSA / DLA) · Mar 9, 2026
- DLA-3549-1 ring - security update Debian Security (DSA / DLA) · Mar 9, 2026
References
- https://github.com/pjsip/pjproject/security/advisories/GHSA-2qpg-f6wf-w984
- https://github.com/pjsip/pjproject/commit/15663e3f37091069b8c98a7fce680dc04bc8e865
- 20220304 AST-2022-004: pjproject: integer underflow on STUN message mailing-list
- http://packetstormsecurity.com/files/166225/Asterisk-Project-Security-Advisory-AST-2022-004.html
- [debian-lts-announce] 20220328 [SECURITY] [DLA 2962-1] pjproject security update mailing-list
- GLSA-202210-37 vendor-advisory
- [debian-lts-announce] 20221117 [SECURITY] [DLA 3194-1] asterisk security update mailing-list
- DSA-5285 vendor-advisory
- [debian-lts-announce] 20230829 [SECURITY] [DLA 3549-1] ring security update mailing-list