---
cve: "CVE-2025-27809"
severity: "MEDIUM"
cvss: 5.4
epss: "19%"
vendor: "Mbed"
kev: false
exploited: false
published: "2025-03-25 06:15:41"
tags: [cve, security, medium]
source: tsecurity.de CVE-Dossier
exported: "2026-09-11T01:56:23+02:00"
---

# CVE-2025-27809

> 5.4 MEDIUM · 🧪 PoC

## Beschreibung

Mbed TLS before 2.28.10 and 3.x before 3.6.3, on the client side, accepts servers that have trusted certificates for arbitrary hostnames unless the TLS client application calls mbedtls_ssl_set_hostname.

## CVSS-Vektor

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

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

## Patch verfügbar (OSV)

- 22098d41c6620ce07cf8a0134d37302355e1e5ef (Commit)

## Referenzen

- <https://github.com/Mbed-TLS/mbedtls/releases>
- <https://mbed-tls.readthedocs.io/en/latest/security-advisories/mbedtls-security-advisory-2025-03-1/>
- <https://github.com/Mbed-TLS/mbedtls/issues/466>
- <https://mastodon.social/@bagder/114219540623402700>

---
_Exportiert aus dem [tsecurity.de CVE-Dossier](https://tsecurity.de/cve?cve=CVE-2025-27809) · Datenquellen: EUVD (ENISA), NVD, OSV, CISA KEV, FIRST EPSS, Exploit-DB, BSI BITS_