CVE-2026-11604

EUVD-2026-36151
An incorrect buffer size calculation in the epoch key generator in OpenVPN ovpn-dco-win version 2.0.0 through 2.8.3 allows a remote authenticated peer to trigger a heap-based buffer overflow and kernel memory corruption via a crafted data packet, resulting in a system crash (denial of service).
ProviderTypeBase ScoreAtk. VectorAtk. ComplexityPriv. RequiredVector
OpenVPNCNA
5.6 MEDIUM
LOCAL
HIGH
LOW
CVSS:4.0/AV:L/AC:H/AT:P/PR:L/UI:P/VC:N/VI:N/VA:H/SC:N/SI:N/SA:H
Base Score
CVSS 3.x
EPSS Score
Percentile: 4%
Early Detection
Affected products identified ahead of NVD analysis through intelligence sources.
VendorProductVersionSource
openvpnovpn-dco-win
2.0.0 ≤
𝑥
≤ 2.5.8
CNA
Common Weakness Enumeration
References
https://community.openvpn.net/Security%20Announcements/CVE-2026-11604
https://github.com/OpenVPN/ovpn-dco-win/releases