CVE-2026-73215

The coturn server can end in a state where it does not accept more requests with "even-port" enabled.

State: Published
Severity: 7.1 High
Published: Aug 11, 2026
Updated: Aug 13, 2026
Reserved: Aug 11, 2026

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.

Scores

CVSS	Score	Vector	Source
4.0	7.1 High	CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N	GitHub_M

Weaknesses

CWE-400 Uncontrolled Resource Consumption
CWE-772 Missing Release of Resource after Effective Lifetime

Affected Products

Product	Versions
coturncoturn	< 4.17.0Affected

References

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