---
cve: "CVE-2026-73214"
severity: "HIGH"
cvss: 8.2
epss: "42%"
vendor: "coturn"
kev: false
exploited: false
published: "2026-08-11 18:18:26"
tags: [cve, security, high]
source: tsecurity.de CVE-Dossier
exported: "2026-09-11T11:40:23+02:00"
---

# CVE-2026-73214

> 8.2 HIGH · 🧪 PoC

## Beschreibung

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.

## CVSS-Vektor

```
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
```

| Metrik | Wert | Bewertung |
|---|---|---|
| AV Angriffsvektor | Netzwerk | bad |
| AC Komplexität | Gering | bad |
| PR Privilegien | Keine | bad |
| UI Interaktion | Keine | bad |

## Patch verfügbar (OSV)

- 37e13d1d60af8f1422c01b5e9f1c6bc355d03b85 (Commit)
- beb4de9dcb6a475129595b943c9a34264420df09 (Commit)

## Referenzen

- <https://github.com/coturn/coturn/security/advisories/GHSA-5x2p-4vqj-f6m4>
- <https://github.com/coturn/coturn/pull/2003>
- <https://github.com/coturn/coturn/pull/2012>
- <https://github.com/coturn/coturn/commit/37e13d1d60af8f1422c01b5e9f1c6bc355d03b85>
- <https://github.com/coturn/coturn/commit/beb4de9dcb6a475129595b943c9a34264420df09>
- <https://github.com/coturn/coturn/releases/tag/4.16.0>

---
_Exportiert aus dem [tsecurity.de CVE-Dossier](https://tsecurity.de/cve?cve=CVE-2026-73214) · Datenquellen: EUVD (ENISA), NVD, OSV, CISA KEV, FIRST EPSS, Exploit-DB, BSI BITS_