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CVE-2026-73214— coturn allocates a full per-peer SSL/session before verifying the DTLS cookie, enabling source-spoofing/botnet state-exhaustion DoS

CVSS 8.2 · High EPSS 0.42% · P35

Possible ATT&CK Techniques 1AI

T1496 · Resource Hijacking

Affected Version Matrix 1

VendorProductVersion RangeStatus
coturncoturn< 4.16.0affected
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I. Basic Information for CVE-2026-73214

Vulnerability Information
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Vulnerability Title
coturn allocates a full per-peer SSL/session before verifying the DTLS cookie, enabling source-spoofing/botnet state-exhaustion DoS
Source: CVE Program / CVE List V5
Vulnerability 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.
Source: CVE Program / CVE List V5
CVSS Information
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
Source: CVE Program / CVE List V5
Vulnerability Type
未加控制的资源消耗(资源穷尽)
Source: CVE Program / CVE List V5
Vulnerability Title
Coturn 资源管理错误漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
Coturn是Coturn组织开源的一款TURN(VoIP媒体业务NAT穿越服务器和网关)和STUN(用户数据报协议简单穿越网络地址转换器)Server的实现。 Coturn 4.16.0之前版本存在资源管理错误漏洞，该漏洞源于dtls_server_input_handler()和create_new_connected_udp_socket()函数在处理分片ClientHello时保留OpenSSL dtls1_reassemble_fragment()状态，可能导致未经身份验证的远程攻击者使用新UD
Source: CNNVD (China National Vulnerability Database)
CVSS Information
N/A
Source: CNNVD (China National Vulnerability Database)
Vulnerability Type
N/A
Source: CNNVD (China National Vulnerability Database)

Affected Products

VendorProductAffected VersionsCPESubscribe
coturncoturn < 4.16.0 -

II. Public POCs for CVE-2026-73214

#POC DescriptionSource LinkShenlong Link
AI-Generated POCPremium
Qwen3.6-35B-A3B · 11294 chars
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III. Intelligence Information for CVE-2026-73214

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Patches & Fixes for CVE-2026-73214 (4)

Vendor Advisories for CVE-2026-73214 (1)

Vendor Pages for CVE-2026-73214 (1)

Same Patch Batch · coturn · 2026-08-11 · 5 CVEs total

CVE-2026-732157.1 HIGHThe coturn server can end in a state where it does not accept more requests with "even-por
CVE-2026-732166.5 MEDIUMcoturn: mobility disconnects bypass allocation quotas and exhaust relay capacity
CVE-2026-732125.8 MEDIUMcoturn peer-IP ACL canonicalization & scope bypass on the RFC 6062 TCP CONNECT relay path
CVE-2026-732135.8 MEDIUMCoturn: `addr_less_eq()` does a component-wise IPv6 comparison instead of a lexicographic

IV. Related Vulnerabilities

Same product: coturn
Same vendor: coturn
Same weakness: CWE-400

V. Comments for CVE-2026-73214

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