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CVE-2026-73212— coturn peer-IP ACL canonicalization & scope bypass on the RFC 6062 TCP CONNECT relay path → internal-network SSRF and proven internal root RCE

Quick assessment

Affected
coturn coturn
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

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 4.13.1之前版本存在安全漏洞，该漏洞源于src/server/ns_turn_server.c中的good_peer_addr()函数在调用src/client/ns_turn_ioaddr.c中的ioa_addr_in_range()时未对IPv4兼容、6to4和64:ff9b::/96 NAT64地址形式进行规范化，可导致经

CVSS 5.8 · Medium EPSS 0.50% · P40

Possible ATT&CK Techniques 1 AI

T1078 · Valid Accounts

Affected Version Matrix 1

VendorProduct Version RangeStatus
coturn coturn < 4.13.1 affected
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I. Basic Information for CVE-2026-73212

Vulnerability Information
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Vulnerability Title
coturn peer-IP ACL canonicalization & scope bypass on the RFC 6062 TCP CONNECT relay path → internal-network SSRF and proven internal root RCE
Source: CVE Program / CVE List V5
Vulnerability Description
Coturn is a free open source implementation of TURN and STUN Server. Prior to 4.13.1, good_peer_addr() in src/server/ns_turn_server.c uses ioa_addr_in_range() in src/client/ns_turn_ioaddr.c without canonicalizing IPv4-compatible, 6to4, and 64:ff9b::/96 NAT64 address forms, allowing an authenticated RFC 6062 TCP CONNECT relay client to bypass an IPv4 denied-peer-ip range when the Coturn host has a useful translation route. This issue is fixed in version 4.13.1.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:4.0/AV:N/AC:L/AT:P/PR:L/UI:N/VC:N/VI:N/VA:N/SC:H/SI:H/SA:H
Source: CVE Program / CVE List V5
Vulnerability Type
访问控制不恰当
Source: CVE Program / CVE List V5
Vulnerability Title
Coturn 权限许可和访问控制问题漏洞
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 4.13.1之前版本存在安全漏洞，该漏洞源于src/server/ns_turn_server.c中的good_peer_addr()函数在调用src/client/ns_turn_ioaddr.c中的ioa_addr_in_range()时未对IPv4兼容、6to4和64:ff9b::/96 NAT64地址形式进行规范化，可导致经
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

Vendor Product Affected Versions CPE Subscribe
coturn coturn < 4.13.1 -

II. Public POCs for CVE-2026-73212

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III. Intelligence Information for CVE-2026-73212

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Patches & Fixes for CVE-2026-73212 (5)

Vendor Advisories for CVE-2026-73212 (1)

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

CVE-2026-73214 8.2 HIGH coturn allocates a full per-peer SSL/session before verifying the DTLS cookie, enabling so
CVE-2026-73215 7.1 HIGH The coturn server can end in a state where it does not accept more requests with "even-por
CVE-2026-73216 6.5 MEDIUM coturn: mobility disconnects bypass allocation quotas and exhaust relay capacity
CVE-2026-73213 5.8 MEDIUM Coturn: `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-284

V. Comments for CVE-2026-73212

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