What’s Vulnerable › Vulnerabilities

CVE-2026-73215: The coturn server can end in a state where it does not accept more requests with "even-port" enabled.

• Severity: high (CVSS 7.1 v4.0)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 0.5% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2026-08-11 · updated 2026-09-09
• Weakness: CWE-400

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

• coturn: before 4.17.0

References

• https://github.com/coturn/coturn/commit/4adbd82e78456e13109bf44deed4ec3aceb0bab2
• https://github.com/coturn/coturn/releases/tag/4.17.0
• https://github.com/coturn/coturn/security/advisories/GHSA-847g-qmc6-6m4r

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