---
cve: "CVE-2026-73212"
severity: "MEDIUM"
cvss: 5.8
epss: "28%"
vendor: "coturn"
kev: false
exploited: false
published: "2026-08-11 18:18:26"
tags: [cve, security, medium]
source: tsecurity.de CVE-Dossier
exported: "2026-09-18T04:50:12+02:00"
---

# CVE-2026-73212

> 5.8 MEDIUM · 🧪 PoC

## Beschreibung

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.

## CVSS-Vektor

```
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
```

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

## Patch verfügbar (OSV)

- cf4b4952de48510d38415b96300da5fc674bfdda (Commit)
- d49ee56aa9fe748af064853d5e430eec1ccc3cbc (Commit)

## Referenzen

- <https://github.com/coturn/coturn/security/advisories/GHSA-2x4g-wx24-48m4>
- <https://github.com/coturn/coturn/pull/1945>
- <https://github.com/coturn/coturn/pull/1947>
- <https://github.com/coturn/coturn/commit/cf4b4952de48510d38415b96300da5fc674bfdda>
- <https://github.com/coturn/coturn/commit/d49ee56aa9fe748af064853d5e430eec1ccc3cbc>
- <https://github.com/coturn/coturn/releases/tag/4.13.1>

---
_Exportiert aus dem [tsecurity.de CVE-Dossier](https://tsecurity.de/cve?cve=CVE-2026-73212) · Datenquellen: EUVD (ENISA), NVD, OSV, CISA KEV, FIRST EPSS, Exploit-DB, BSI BITS_