{"id":"CVE-2026-73214","aliases":["DEBIAN-CVE-2026-73214","EUVD-2026-56820","GHSA-5x2p-4vqj-f6m4","UBUNTU-CVE-2026-73214","openSUSE-SU-2026:11617-1"],"status":"published","title":"coturn allocates a full per-peer SSL/session before verifying the DTLS cookie, enabling source-spoofing/botnet state-exhaustion DoS","description":"Coturn is a free open source implementation of TURN and STUN Server. Prior to 4.16.0, dtls_server_input_handler() and create_new_connected_udp_socket() in src/apps/relay/dtls_listener.c retain OpenSSL dtls1_reassemble_fragment() state for a 35-byte fragmented ClientHello declaring a 650,000-byte handshake before cookie validation, allowing an unauthenticated remote sender using fresh UDP tuples to exhaust memory without TURN credentials, a completed handshake, a valid cookie, or source spoofing. This issue is fixed in version 4.16.0.","severity":{"version":"4.0","score":8.2,"vector":"CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N","level":"high","assessor":"cna","from":"cve"},"epss":{"day":"2026-11-12","score":0.00577,"percentile":0.48032,"model":"v2026.06.15"},"facts":{"in_kev":false,"known_exploited":false,"public_exploit":false,"fix_available":true},"cwes":["CWE-400","CWE-770"],"published":"2026-08-11T17:34:51Z","modified":"2026-10-28T11:22:59Z","fixes":[{"ecosystem":"Debian:14","package":"coturn","fixed_in":["4.18.0-1"],"sources":["osv"]}],"affected":[{"source":"osv","ecosystem":"Debian:12","package":"coturn","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"versions":["4.12.0-1","4.14.0-1","4.15.0-1","4.18.0-1","4.6.1-1","4.6.1-2"]},{"source":"osv","ecosystem":"Debian:13","package":"coturn","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"versions":["4.12.0-1","4.14.0-1","4.15.0-1","4.18.0-1","4.6.1-2"]},{"source":"osv","ecosystem":"Debian:14","package":"coturn","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"4.18.0-1"}]}],"versions":["4.12.0-1","4.14.0-1","4.15.0-1","4.6.1-2"]},{"source":"osv","ecosystem":"Ubuntu:16.04:LTS","package":"coturn","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"versions":["4.4.5.4-2","4.5.0.2-3","4.5.0.3-1","4.5.0.3-1build1","4.5.0.3-1ubuntu0.2","4.5.0.3-1ubuntu0.3","4.5.0.3-1ubuntu0.4"]},{"source":"osv","ecosystem":"Ubuntu:18.04:LTS","package":"coturn","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"versions":["4.5.0.6-1ubuntu2","4.5.0.7-1ubuntu1","4.5.0.7-1ubuntu2","4.5.0.7-1ubuntu2.18.04.1","4.5.0.7-1ubuntu2.18.04.2","4.5.0.7-1ubuntu2.18.04.3"]},{"source":"osv","ecosystem":"Ubuntu:20.04:LTS","package":"coturn","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"versions":["4.5.1.1-1.1build1","4.5.1.1-1.1build2","4.5.1.1-1.1ubuntu0.20.04.1","4.5.1.1-1.1ubuntu0.20.04.2"]},{"source":"osv","ecosystem":"Ubuntu:22.04:LTS","package":"coturn","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"versions":["4.5.2-3","4.5.2-3.1~ubuntu22.04.1"]},{"source":"osv","ecosystem":"Ubuntu:24.04:LTS","package":"coturn","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"versions":["4.6.1-1build1","4.6.1-1build2","4.6.1-1build3","4.6.1-1build4"]},{"source":"osv","ecosystem":"Ubuntu:26.10","package":"coturn","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"versions":["4.6.1-2build2","4.12.0-1","4.14.0-1","4.15.0-1","4.18.0-1"]},{"source":"osv","ecosystem":"Ubuntu:26.04:LTS","package":"coturn","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"versions":["4.6.1-2build1","4.6.1-2build2"]},{"source":"osv","ecosystem":"openSUSE:Tumbleweed","package":"coturn","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"4.17.2-1.1"}]}],"bundled":17}],"products":[{"vendor":"coturn","product":"coturn"}],"references":[{"url":"https://github.com/coturn/coturn/security/advisories/GHSA-5x2p-4vqj-f6m4","tags":["x_refsource_CONFIRM","advisory","report"]},{"url":"https://github.com/coturn/coturn/pull/2003","tags":["x_refsource_MISC","fix","report"]},{"url":"https://github.com/coturn/coturn/pull/2012","tags":["x_refsource_MISC","fix","report"]},{"url":"https://github.com/coturn/coturn/commit/37e13d1d60af8f1422c01b5e9f1c6bc355d03b85","tags":["x_refsource_MISC","fix","report"]},{"url":"https://github.com/coturn/coturn/commit/beb4de9dcb6a475129595b943c9a34264420df09","tags":["x_refsource_MISC","fix","report"]},{"url":"https://github.com/coturn/coturn/releases/tag/4.16.0","tags":["x_refsource_MISC","web","report"]},{"url":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/73xxx/CVE-2026-73214.json","tags":["advisory"]},{"url":"https://nvd.nist.gov/vuln/detail/CVE-2026-73214","tags":["advisory"]},{"url":"https://security-tracker.debian.org/tracker/CVE-2026-73214","tags":["advisory"]},{"url":"https://ubuntu.com/security/CVE-2026-73214","tags":["report"]},{"url":"https://www.cve.org/CVERecord?id=CVE-2026-73214","tags":["report"]},{"url":"","tags":["advisory"]},{"url":"https://www.suse.com/security/cve/CVE-2026-40613","tags":["web"]},{"url":"https://www.suse.com/security/cve/CVE-2026-43915","tags":["web"]},{"url":"https://www.suse.com/security/cve/CVE-2026-43994","tags":["web"]},{"url":"https://www.suse.com/security/cve/CVE-2026-53448","tags":["web"]},{"url":"https://www.suse.com/security/cve/CVE-2026-53449","tags":["web"]},{"url":"https://www.suse.com/security/cve/CVE-2026-53450","tags":["web"]},{"url":"https://www.suse.com/security/cve/CVE-2026-62959","tags":["web"]},{"url":"https://www.suse.com/security/cve/CVE-2026-65981","tags":["web"]},{"url":"https://www.suse.com/security/cve/CVE-2026-68552","tags":["web"]},{"url":"https://www.suse.com/security/cve/CVE-2026-68553","tags":["web"]},{"url":"https://www.suse.com/security/cve/CVE-2026-68554","tags":["web"]},{"url":"https://www.suse.com/security/cve/CVE-2026-68555","tags":["web"]},{"url":"https://www.suse.com/security/cve/CVE-2026-73212","tags":["web"]},{"url":"https://www.suse.com/security/cve/CVE-2026-73213","tags":["web"]},{"url":"https://www.suse.com/security/cve/CVE-2026-73214","tags":["web"]},{"url":"https://www.suse.com/security/cve/CVE-2026-73215","tags":["web"]},{"url":"https://www.suse.com/security/cve/CVE-2026-73216","tags":["web"]}],"sources":{"cve":[{"id":"CVE-2026-73214","title":"coturn allocates a full per-peer SSL/session before verifying the DTLS cookie, enabling source-spoofing/botnet state-exhaustion DoS","description":"Coturn is a free open source implementation of TURN and STUN Server. Prior to 4.16.0, dtls_server_input_handler() and create_new_connected_udp_socket() in src/apps/relay/dtls_listener.c retain OpenSSL dtls1_reassemble_fragment() state for a 35-byte fragmented ClientHello declaring a 650,000-byte handshake before cookie validation, allowing an unauthenticated remote sender using fresh UDP tuples to exhaust memory without TURN credentials, a completed handshake, a valid cookie, or source spoofing. This issue is fixed in version 4.16.0.","status":"published","published":"2026-08-11T17:34:51.86Z","modified":"2026-08-12T22:13:33.373Z","cvss":[{"version":"4.0","score":8.2,"vector":"CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N","level":"high","assessor":"cna"}],"cwes":["CWE-400","CWE-770"],"updated_at":"2026-11-02T13:43:22.599321Z"}],"euvd":[{"id":"EUVD-2026-56820","description":"Coturn is a free open source implementation of TURN and STUN Server. Prior to 4.16.0, dtls_server_input_handler() and create_new_connected_udp_socket() in src/apps/relay/dtls_listener.c retain OpenSSL dtls1_reassemble_fragment() state for a 35-byte fragmented ClientHello declaring a 650,000-byte handshake before cookie validation, allowing an unauthenticated remote sender using fresh UDP tuples to exhaust memory without TURN credentials, a completed handshake, a valid cookie, or source spoofing. This issue is fixed in version 4.16.0.","status":"published","published":"2026-08-11T17:34:51Z","modified":"2026-08-12T22:13:33Z","cvss":[{"version":"4.0","score":8.2,"vector":"CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N","level":"high"}],"updated_at":"2026-11-02T18:01:57.602969Z"}],"nvd":[{"id":"CVE-2026-73214","description":"Coturn is a free open source implementation of TURN and STUN Server. Prior to 4.16.0, dtls_server_input_handler() and create_new_connected_udp_socket() in src/apps/relay/dtls_listener.c retain OpenSSL dtls1_reassemble_fragment() state for a 35-byte fragmented ClientHello declaring a 650,000-byte handshake before cookie validation, allowing an unauthenticated remote sender using fresh UDP tuples to exhaust memory without TURN credentials, a completed handshake, a valid cookie, or source spoofing. This issue is fixed in version 4.16.0.","status":"published","published":"2026-08-11T18:18:26.773Z","modified":"2026-09-09T20:55:04.493Z","cvss":[{"version":"4.0","score":8.2,"vector":"CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X","level":"high","assessor":"secondary"}],"cwes":["CWE-400","CWE-770"],"updated_at":"2026-11-02T14:12:36.880938Z"}],"osv":[{"id":"CVE-2026-73214","title":"coturn allocates a full per-peer SSL/session before verifying the DTLS cookie, enabling source-spoofing/botnet state-exhaustion DoS","description":"Coturn is a free open source implementation of TURN and STUN Server. Prior to 4.16.0, dtls_server_input_handler() and create_new_connected_udp_socket() in src/apps/relay/dtls_listener.c retain OpenSSL dtls1_reassemble_fragment() state for a 35-byte fragmented ClientHello declaring a 650,000-byte handshake before cookie validation, allowing an unauthenticated remote sender using fresh UDP tuples to exhaust memory without TURN credentials, a completed handshake, a valid cookie, or source spoofing. This issue is fixed in version 4.16.0.","status":"published","published":"2026-08-11T17:34:51.86Z","modified":"2026-10-28T11:22:59.888356025Z","cvss":[{"version":"4.0","score":8.2,"vector":"CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N","level":"high"}],"cwes":["CWE-400","CWE-770"],"updated_at":"2026-11-02T15:45:15.88521Z"},{"id":"DEBIAN-CVE-2026-73214","description":"Coturn is a free open source implementation of TURN and STUN Server. Prior to 4.16.0, dtls_server_input_handler() and create_new_connected_udp_socket() in src/apps/relay/dtls_listener.c retain OpenSSL dtls1_reassemble_fragment() state for a 35-byte fragmented ClientHello declaring a 650,000-byte handshake before cookie validation, allowing an unauthenticated remote sender using fresh UDP tuples to exhaust memory without TURN credentials, a completed handshake, a valid cookie, or source spoofing. This issue is fixed in version 4.16.0.","status":"published","published":"2026-08-11T18:18:26.773Z","modified":"2026-10-10T16:00:08.864602016Z","cvss":[{"version":"4.0","score":8.2,"vector":"CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X","level":"high"}],"updated_at":"2026-11-02T15:46:02.499355Z"},{"id":"UBUNTU-CVE-2026-73214","description":"Coturn is a free open source implementation of TURN and STUN Server. Prior to 4.16.0, dtls_server_input_handler() and create_new_connected_udp_socket() in src/apps/relay/dtls_listener.c retain OpenSSL dtls1_reassemble_fragment() state for a 35-byte fragmented ClientHello declaring a 650,000-byte handshake before cookie validation, allowing an unauthenticated remote sender using fresh UDP tuples to exhaust memory without TURN credentials, a completed handshake, a valid cookie, or source spoofing. This issue is fixed in version 4.16.0.","status":"published","published":"2026-08-11T18:18:00Z","modified":"2026-10-17T13:01:00.93390236Z","cvss":[{"version":"4.0","score":8.2,"vector":"CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N","level":"high"}],"updated_at":"2026-11-02T16:57:08.628462Z"},{"id":"openSUSE-SU-2026:11617-1","title":"coturn-4.17.2-1.1 on GA media","description":"These are all security issues fixed in the coturn-4.17.2-1.1 package on the GA media of openSUSE Tumbleweed.","status":"published","published":"2026-08-27T00:00:00Z","modified":"2026-08-28T18:23:08.654818419Z","updated_at":"2026-11-02T16:58:39.516824Z"}]}}