Description
Coturn is a free open source implementation of TURN and STUN Server. Prior to 4.17.0, turnports_allocate_even() in src/apps/relay/turn_ports.c marks the unused odd sibling port as TPS_TAKEN_ODD for an EVEN-PORT Allocate request with reservation bit R=0 even though no RTCP socket will release it, allowing an authenticated client to permanently exhaust the relay port pool and cause subsequent allocations to fail with STUN error 508. This issue is fixed in version 4.17.0.
Affected products
| Vendor | Product | Affected | Fixed |
|---|---|---|---|
| coturn | coturn | < 4.17.0 | — |
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 | 4.18.0-1 | — |
| Debian 13 | coturn | No fix yet | — |
| Debian 12 | coturn | No fix yet | — |
Ubuntu
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Ubuntu 26.10 | coturn | No fix yet | — |
| Ubuntu 26.04 LTS | coturn | No fix yet | — |
| Ubuntu 24.04 LTS | coturn | No fix yet | — |
| Ubuntu 22.04 LTS | coturn | No fix yet | — |
| Ubuntu 20.04 LTS | coturn | No fix yet | — |
Show 2 more (older releases, extended support, other products)Fewer releases
| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Ubuntu 18.04 LTS | coturn | No fix yet | — |
| Ubuntu 16.04 LTS | coturn | No fix yet | — |
openSUSE
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| openSUSE Tumbleweed | coturn | 4.17.2-1.1 | openSUSE-SU-2026:11617-1 |
Advisories 1
- openSUSE-SU-2026:11617-1 coturn-4.17.2-1.1 on GA media SUSE / openSUSE Security Updates · Aug 28, 2026