---
cve: "CVE-2026-73216"
severity: "MEDIUM"
cvss: 6.5
epss: "0.4%"
vendor: "coturn"
kev: false
exploited: false
published: "2026-08-11 18:18:27"
tags: [cve, security, medium]
source: tsecurity.de CVE-Dossier
exported: "2026-09-24T17:58:29+02:00"
---

# CVE-2026-73216

> 6.5 MEDIUM · 🧪 PoC

## Beschreibung

Coturn is a free open source implementation of TURN and STUN Server. Prior to 4.17.0, shutdown_client_connection() in src/server/ns_turn_server.c prematurely calls dec_quota() and releases bandwidth accounting during the first-stage close of a mobility-enabled allocation while preserving the allocation, relay socket, session, and mobility ticket, allowing an authenticated client to bypass --user-quota and --total-quota and exhaust relay ports. This issue is fixed in version 4.17.0.

## CVSS-Vektor

```
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
```

| Metrik | Wert | Bewertung |
|---|---|---|
| AV Angriffsvektor | Netzwerk | bad |
| AC Komplexität | Gering | bad |
| PR Privilegien | Gering | warn |
| UI Interaktion | Keine | bad |
| S Scope | Unverändert | good |
| C Vertraulichkeit | Keine | good |
| I Integrität | Keine | good |
| A Verfügbarkeit | Hoch | bad |

## Patch verfügbar (OSV)

- 3c5b2615fd405c4e7c5bf3fbeef895c94a90671b (Commit)
- 54ef76cebfff2bb99b35438858a4ef412d84128d (Commit)

## Referenzen

- <https://github.com/coturn/coturn/security/advisories/GHSA-f6hc-79w3-p8pq>
- <https://github.com/coturn/coturn/commit/3c5b2615fd405c4e7c5bf3fbeef895c94a90671b>
- <https://github.com/coturn/coturn/releases/tag/4.17.0>

---
_Exportiert aus dem [tsecurity.de CVE-Dossier](https://tsecurity.de/cve?cve=CVE-2026-73216) · Datenquellen: EUVD (ENISA), NVD, OSV, CISA KEV, FIRST EPSS, Exploit-DB, BSI BITS_