Buffer overflow in Openvpn

CVE-2026-11771

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

Vulnerability class: Buffer Overflow

Affected products

  • Openvpn — versions 2.1.0, 2.7_alpha1

Weakness classification (CWE)

References