Description
In coturn before version 4.5.1.3, there is an issue whereby STUN/TURN response buffer is not initialized properly. There is a leak of information between different client connections. One client (an attacker) could use their connection to intelligently query coturn to get interesting bytes in the padding bytes from the connection of another client. This has been fixed in 4.5.1.3.
Affected products
| Vendor | Product | Affected | Fixed |
|---|---|---|---|
| coturn | coturn | >= 5.1.1, < 6.0.0 | — |
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 | coturn | 4.5.1.3-1 | — |
| Debian 13 | coturn | 4.5.1.3-1 | — |
| Debian 12 | coturn | 4.5.1.3-1 | — |
| Debian 10 | coturn | 4.5.1.1-1.1+deb10u1 | DSA-4711-1 |
| Debian 9 | coturn | 4.5.0.5-1+deb9u2 | DSA-4711-1 |
Show 1 more (older releases, extended support, other products)Fewer releases
| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Debian 8 | coturn | 4.2.1.2-1+deb8u2 | DLA-2271-1 |
Ubuntu
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Ubuntu 20.04 LTS | coturn | 4.5.1.1-1.1ubuntu0.20.04.1 | USN-4415-1 |
| Ubuntu 18.04 LTS | coturn | 4.5.0.7-1ubuntu2.18.04.2 | USN-4415-1 |
| Ubuntu 16.04 LTS | coturn | 4.5.0.3-1ubuntu0.3 | USN-4415-1 |
openSUSE
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| openSUSE Tumbleweed | coturn | 4.5.2-2.2 | openSUSE-SU-2024:10696-1 |
| openSUSE Leap 15.2 | coturn | 4.5.1.3-lp152.2.3.1 | openSUSE-SU-2020:0937-1 |
Alpine
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Alpine v3.24 | coturn | 4.5.1.3-r0 | — |
| Alpine v3.23 | coturn | 4.5.1.3-r0 | — |
| Alpine v3.22 | coturn | 4.5.1.3-r0 | — |
| Alpine v3.21 | coturn | 4.5.1.3-r0 | — |
| Alpine v3.20 | coturn | 4.5.1.3-r0 | — |
Show 8 more (older releases, extended support, other products)Fewer releases
| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Alpine v3.19 | coturn | 4.5.1.3-r0 | — |
| Alpine v3.18 | coturn | 4.5.1.3-r0 | — |
| Alpine v3.17 | coturn | 4.5.1.3-r0 | — |
| Alpine v3.16 | coturn | 4.5.1.3-r0 | — |
| Alpine v3.15 | coturn | 4.5.1.3-r0 | — |
| Alpine v3.14 | coturn | 4.5.1.3-r0 | — |
| Alpine v3.13 | coturn | 4.5.1.3-r0 | — |
| Alpine v3.12 | coturn | 4.5.1.3-r0 | — |
Advisories 5
- DSA-4711-1 coturn - security update Debian Security (DSA / DLA) · Mar 9, 2026
- DLA-2271-1 coturn - security update Debian Security (DSA / DLA) · Mar 9, 2026
- USN-4415-1 coturn vulnerabilities Ubuntu Security Notices (USN) · Feb 10, 2026
- openSUSE-SU-2020:0937-1 Security update for coturn SUSE / openSUSE Security Updates · Feb 4, 2026
- openSUSE-SU-2024:10696-1 coturn-4.5.2-2.2 on GA media SUSE / openSUSE Security Updates · Feb 4, 2026
References
- https://github.com/coturn/coturn/security/advisories/GHSA-c8r8-8vp5-6gcm
- https://github.com/coturn/coturn/issues/583
- https://github.com/coturn/coturn/blob/aab60340b201d55c007bcdc853230f47aa2dfdf1/ChangeLog#L15
- DSA-4711 vendor-advisory
- [debian-lts-announce] 20200701 [SECURITY] [DLA 2271-1] coturn security update mailing-list
- openSUSE-SU-2020:0937 vendor-advisory
- USN-4415-1 vendor-advisory
- FEDORA-2020-9eadf517de vendor-advisory
- FEDORA-2020-d946f64eea vendor-advisory