Is this vulnerability remotely exploitable?

Yes. If the TURN service is exposed to clients (e.g., on the public internet) and allows them to issue `CreatePermission` or `ChannelBind` requests, a remote attacker can exploit this issue by using IPv4-mapped IPv6 addresses for blocked targets.

What level of access does an attacker need?

The attacker needs the ability to act as a TURN client against the vulnerable server. Depending on configuration, this may require TURN credentials, or the service may be more broadly accessible. No shell or OS-level access to the server is required.

What is the safest general fix pattern?

Ensure that all address handling and access control routines normalize addresses to a canonical form before comparison, including explicitly recognizing IPv4-mapped IPv6 addresses and applying loopback and deny-list checks consistently across all address families.

Severity:

HIGH RISK

(7.2)

Access Control Bypass via IPv4-Mapped IPv6 (CWE-284) in Coturn TURN/STUN Server

CVE-2026-27624

Published:

Feb 24, 2026

Status:

Analyzed

Summary

Affected Context

Exploit Preconditions

Why This Happens

Potential Impact

General Mitigation Guidance

How Teams Detect Issues Like This

Frequently Asked Questions

Source

NDV

Recent Vulnerabilities

CWE-77;CWE-78

HIGH RISK

HIGH

(7.3)

OS Command Injection (CWE-78) in Totolink A7100RU setGameSpeedCfg CGI Handler

Remote Code Execution on the Router

April 6, 2026

CWE-77;CWE-78

HIGH RISK

HIGH

(7.3)

OS Command Injection (CWE-78) in Totolink A7100RU setFirewallType Handler

Remote Code Execution on Router Firmware

April 6, 2026

Vulnerability Type

Category:

Access Control Bypass

CWE:

CWE-284;CWE-441

Impact:

Bypass of network access controls and potential exposure of internal services over TURN

Severity:

HIGH RISK

(7.2)

CVSS Version:

3.1

Vulnerability Type

Category:

Access Control Bypass

CWE:

CWE-284;CWE-441

Impact:

Bypass of network access controls and potential exposure of internal services over TURN

Severity:

HIGH RISK

(7.2)

CVSS Version:

3.1

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Access Control Bypass via IPv4-Mapped IPv6 (CWE-284) in Coturn TURN/STUN Server

Summary

Affected Context

Exploit Preconditions

Why This Happens

Potential Impact

General Mitigation Guidance

How Teams Detect Issues Like This

Frequently Asked Questions

Source

Recent Vulnerabilities

HIGH RISK

HIGH

(7.3)

OS Command Injection (CWE-78) in Totolink A7100RU setGameSpeedCfg CGI Handler

HIGH RISK

HIGH

(7.3)

OS Command Injection (CWE-78) in Totolink A7100RU setFirewallType Handler

Vulnerability Type

Vulnerability Type

Vulnerability Type

Catch This CVE While Code Is Being Written

Ship clean & secure code faster

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