CVE-2026-11604

State: Published
Severity: 5.6 Medium
Published: Jun 10, 2026
Updated: Jun 11, 2026
Reserved: Jun 8, 2026

Description

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).

Scores

CVSS	Score	Vector	Source
4.0	5.6 Medium	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	OpenVPN

Weaknesses

CWE-131 Incorrect calculation of buffer size
CWE-122 Heap-based buffer overflow
CWE-787 Out-of-bounds write

Affected Products

Product	Versions
ovpn-dco-winOpenVPN	2.0.0 through 2.5.8Affected

References

https://github.com/OpenVPN/ovpn-dco-win/releasesproduct
https://community.openvpn.net/Security%20Announcements/CVE-2026-11604vendor-advisory

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