CVE-2026-11771

EUVD-2026-51237
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
ProviderTypeBase ScoreAtk. VectorAtk. ComplexityPriv. RequiredVector
NISTPrimary
7.5 HIGH
NETWORK
LOW
NONE
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
Base Score
CVSS 3.x
EPSS Score
Percentile: 30.93%
Affected Products (NVD)
VendorProductVersion
openvpnopenvpn
2.1.0 ≤
𝑥
< 2.6.21
openvpnopenvpn
2.7 ≤
𝑥
< 2.7.5
𝑥
= Vulnerable software versions
Debian logo
Debian Releases
Debian Product
Codename
openvpn
bookworm
2.6.14-0+deb12u2
fixed
bookworm (security)
2.6.14-0+deb12u2
fixed
bullseye
not-affected
forky
2.7.5-1
fixed
sid
2.7.7-1
fixed
trixie
2.6.14-1+deb13u3
fixed
trixie (security)
2.6.14-1+deb13u3
fixed
Ubuntu logo
Ubuntu Releases
Ubuntu Product
Codename
openvpn
bionic
not-affected
focal
not-affected
jammy
not-affected
noble
Fixed 2.6.19-0ubuntu0.24.04.3
released
questing
ignored
resolute
Fixed 2.7.0-1ubuntu1.2
released
trusty
not-affected
xenial
not-affected
openSUSE logo
openSUSE / SLES Releases
openSUSE Product
Release
openvpn
suse enterprise desktop 15 SP7
2.6.10-150600.3.26.1
fixed
suse enterprise sap 15 SP6
2.6.10-150600.3.26.1
fixed
suse enterprise sap 15 SP7
2.6.10-150600.3.26.1
fixed
suse enterprise server 15 SP6
2.6.10-150600.3.26.1
fixed
suse enterprise server 15 SP7
2.6.10-150600.3.26.1
fixed
openvpn-auth-pam-plugin
suse enterprise desktop 15 SP7
2.6.10-150600.3.26.1
fixed
suse enterprise sap 15 SP6
2.6.10-150600.3.26.1
fixed
suse enterprise sap 15 SP7
2.6.10-150600.3.26.1
fixed
suse enterprise server 15 SP6
2.6.10-150600.3.26.1
fixed
suse enterprise server 15 SP7
2.6.10-150600.3.26.1
fixed
openvpn-dco
suse enterprise desktop 15 SP7
2.6.10-150600.3.26.1
fixed
suse enterprise sap 15 SP6
2.6.10-150600.3.26.1
fixed
suse enterprise sap 15 SP7
2.6.10-150600.3.26.1
fixed
suse enterprise server 15 SP6
2.6.10-150600.3.26.1
fixed
suse enterprise server 15 SP7
2.6.10-150600.3.26.1
fixed
openvpn-dco-devel
suse enterprise desktop 15 SP7
2.6.10-150600.3.26.1
fixed
suse enterprise sap 15 SP6
2.6.10-150600.3.26.1
fixed
suse enterprise sap 15 SP7
2.6.10-150600.3.26.1
fixed
suse enterprise server 15 SP6
2.6.10-150600.3.26.1
fixed
suse enterprise server 15 SP7
2.6.10-150600.3.26.1
fixed
openvpn-devel
suse enterprise desktop 15 SP7
2.6.10-150600.3.26.1
fixed
suse enterprise sap 15 SP6
2.6.10-150600.3.26.1
fixed
suse enterprise sap 15 SP7
2.6.10-150600.3.26.1
fixed
suse enterprise server 15 SP6
2.6.10-150600.3.26.1
fixed
suse enterprise server 15 SP7
2.6.10-150600.3.26.1
fixed
Amazon Linux logo
Amazon Linux Releases
Amazon Package
Release
openvpn
Amazon Linux 2023
0:2.6.12-1.amzn2023.0.5
fixed
openvpn-debuginfo
Amazon Linux 2023
0:2.6.12-1.amzn2023.0.5
fixed
openvpn-debugsource
Amazon Linux 2023
0:2.6.12-1.amzn2023.0.5
fixed
openvpn-devel
Amazon Linux 2023
0:2.6.12-1.amzn2023.0.5
fixed
Common Weakness Enumeration
Vulnerability Media Exposure
References
https://community.openvpn.net/ReleaseHistory#openvpn-2621-released-1-july-2026
https://community.openvpn.net/ReleaseHistory#openvpn-275-released-1-july-2026
https://community.openvpn.net/Security%20Announcements/CVE-2026-11771