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    CVE-2026-73215

    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.

    Published:Aug 11, 2026
    Last Modified:Aug 13, 2026
    EPS:Aug 11, 2026
    EPSS Score:0.00331
    CVSS Score:6.5

    Affected Products

    Vendor
    Coturn
    Product
    Coturn

    Exploits

    No exploit reference

    Related CVEs

    CVE-2026-68555 (CVSS 6.5) — Coturn is a free open source implementation of TURN and STUN Server. In 4.15.0, an authenticated TURN user can…
    CVE-2026-68552 (CVSS 5.3) — Coturn is a free open source implementation of TURN and STUN Server. Prior to 4.15.0, an unauthenticated remot…
    CVE-2026-68554 (CVSS 2.3) — Coturn is a free open source implementation of TURN and STUN Server. Prior to 4.15.0, an on-path attacker can …
    CVE-2026-68553 (CVSS 7.1) — Coturn is a free open source implementation of TURN and STUN Server. Prior to 4.13.0, an authenticated TURN us…
    CVE-2026-73216 (CVSS 6.5) — Coturn is a free open source implementation of TURN and STUN Server. Prior to 4.17.0, shutdown_client_connecti…
    CVE-2026-73214 (CVSS 8.2) — Coturn is a free open source implementation of TURN and STUN Server. Prior to 4.16.0, dtls_server_input_handle…
    CVE-2026-73213 (CVSS 5.8) — Coturn is a free open source implementation of TURN and STUN Server. Prior to 4.16.0, addr_less_eq() in src/cl…
    CVE-2026-73212 (CVSS 5.8) — Coturn is a free open source implementation of TURN and STUN Server. Prior to 4.13.1, good_peer_addr() in src/…
    CVE-2026-65981 (CVSS 7.1) — Coturn is a free open source implementation of TURN and STUN Server. Prior to 4.15.0, a server using --mobilit…
    CVE-2026-62959 (CVSS 8.2) — Coturn is a free open source implementation of TURN and STUN Server. From 4.5.2 through 4.14.0, when Coturn is…

    Common Vulnerability Scoring System

    Attack Vector
    Network
    Adjacent
    Local
    Physical
    Privileges Required
    None
    Low
    High
    User Interaction
    None
    Required
    Scope
    Unchanged
    Changed
    Confidentiality
    None
    Low
    High
    Integrity
    None
    Low
    High
    Availability
    None
    Low
    High