---
cve: "CVE-2026-11771"
severity: "HIGH"
cvss: 7.0
epss: "38%"
vendor: "OpenVPN"
kev: false
exploited: false
published: "2026-07-30 17:16:27"
tags: [cve, security, high]
source: tsecurity.de CVE-Dossier
exported: "2026-09-16T15:56:42+02:00"
---

# CVE-2026-11771

> 7.0 HIGH

## Beschreibung

OpenVPN version 2.1.0 through 2.6.20 and 2.7_alpha1 through 2.7.4 allows attackers via an off-by-one buffer write in the NTLM proxy authentication to potentially cause a crash via a crafted NTLM response from a malicious proxy server

## CVSS-Vektor

```
CVSS:4.0/AV:N/AC:H/AT:P/PR:N/UI:P/VC:N/VI:N/VA:H/SC:N/SI:N/SA:H
```

| Metrik | Wert | Bewertung |
|---|---|---|
| AV Angriffsvektor | Netzwerk | bad |
| AC Komplexität | Hoch | good |
| PR Privilegien | Keine | bad |

## Patch verfügbar (OSV)

- 4dee614e4e799d6d4a20bffabd902291c86406f2 (Commit)
- b25bb2a8bda814edab39b4246d4e296330a7a29e (Commit)

## Referenzen

- <https://community.openvpn.net/Security%20Announcements/CVE-2026-11771>
- <https://community.openvpn.net/ReleaseHistory#openvpn-275-released-1-july-2026>
- <https://community.openvpn.net/ReleaseHistory#openvpn-2621-released-1-july-2026>

---
_Exportiert aus dem [tsecurity.de CVE-Dossier](https://tsecurity.de/cve?cve=CVE-2026-11771) · Datenquellen: EUVD (ENISA), NVD, OSV, CISA KEV, FIRST EPSS, Exploit-DB, BSI BITS_