# CVE-2026-11771

## Summary

- **CVE ID:** CVE-2026-11771
- **Severity:** HIGH
- **CVSS Score:** 7 (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)
- **CWE:** CWE-193, CWE-121, CWE-787
- **Published:** Jul 30, 2026
- **Last Modified:** Jul 30, 2026

## Description

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

## Affected Products

- OpenVPN — OpenVPN (2.1.0)
- OpenVPN — OpenVPN (2.7_alpha1)

## References

- [CNA](https://community.openvpn.net/Security%20Announcements/CVE-2026-11771)
- [CNA](https://community.openvpn.net/ReleaseHistory#openvpn-275-released-1-july-2026)
- [CNA](https://community.openvpn.net/ReleaseHistory#openvpn-2621-released-1-july-2026)

## Exploitation Prediction (EPSS)

- **EPSS Score:** 0.38%
- **EPSS Percentile:** 30.8

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_Exported from OnDuty AI Vulnerability Intelligence on 2026-09-11._