Coturn up to 4.15.x DTLS Listener dtls_listener.c state issue

CVSS Meta Temp Score
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CTI Interest Score
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5.1$0-$5k0.41+

Summaryinfo

A vulnerability marked as problematic has been reported in Coturn up to 4.15.x. This affects the function dtls_server_input_handler/create_new_connected_udp_socket of the file src/apps/relay/dtls_listener.c of the component DTLS Listener. The manipulation leads to state issue. This vulnerability is referenced as CVE-2026-73214. Remote exploitation of the attack is possible. No exploit is available.

Detailsinfo

A vulnerability was found in Coturn up to 4.15.x. It has been rated as problematic. This issue affects the function dtls_server_input_handler/create_new_connected_udp_socket of the file src/apps/relay/dtls_listener.c of the component DTLS Listener. The manipulation with an unknown input leads to a state issue vulnerability. Using CWE to declare the problem leads to CWE-371. Impacted is availability. The summary by CVE is:

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.

The advisory is shared at github.com. The identification of this vulnerability is CVE-2026-73214 since 08/11/2026. The exploitation is known to be easy. The attack may be initiated remotely. No form of authentication is needed for a successful exploitation. Technical details are known, but no exploit is available.

Upgrading to version 4.16.0 eliminates this vulnerability.

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Productinfo

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Version

Website

CPE 2.3info

CPE 2.2info

CVSSv4info

VulDB Vector: 🔒
VulDB Reliability: 🔍

CVSSv3info

VulDB Meta Base Score: 5.3
VulDB Meta Temp Score: 5.1

VulDB Base Score: 5.3
VulDB Temp Score: 5.1
VulDB Vector: 🔒
VulDB Reliability: 🔍

CVSSv2info

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VulDB Base Score: 🔒
VulDB Temp Score: 🔒
VulDB Reliability: 🔍

Exploitinginfo

Class: State issue
CWE: CWE-371
CAPEC: 🔒
ATT&CK: 🔒

Physical: No
Local: No
Remote: Yes

Availability: 🔒
Status: Not defined
Price Prediction: 🔍
Current Price Estimation: 🔒

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Threat Intelligenceinfo

Interest: 🔍
Active Actors: 🔍
Active APT Groups: 🔍

Countermeasuresinfo

Recommended: Upgrade
Status: 🔍

0-Day Time: 🔒

Upgrade: Coturn 4.16.0

Timelineinfo

08/11/2026 Advisory disclosed
08/11/2026 +0 days CVE reserved
08/11/2026 +0 days VulDB entry created
08/11/2026 +0 days VulDB entry last update

Sourcesinfo

Product: github.com

Advisory: github.com
Status: Confirmed

CVE: CVE-2026-73214 (🔒)
GCVE (CVE): GCVE-0-2026-73214
GCVE (VulDB): GCVE-100-388385

Entryinfo

Created: 08/11/2026 20:48
Changes: 08/11/2026 20:48 (56)
Complete: 🔍
Cache ID: 216::103

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