CVEvulnerability

CVE-2026-11771

7.0 HIGH Published 2026-07-30 Modified 2026-08-05 Official page ↗
Status
Analyzed
Published
2026-07-30
Last modified
2026-08-05
Assigner
[email protected]
CVSS 4.0 ([email protected])
7.0 HIGH — 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/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X
CVSS 3.1 ([email protected])
7.5 HIGH — CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
Weaknesses
CWE-121, CWE-193, CWE-787

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 configurations

• openvpn openvpn (>= 2.1.0 < 2.6.21) • openvpn openvpn (>= 2.7 < 2.7.5)

Related

Weakness · CWE (3)

  • CWE-121 Stack-based Buffer Overflow weakness
  • CWE-193 Off-by-one Error weakness
  • CWE-787 Out-of-bounds Write weakness

References