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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).

PUBLISHED Reserved 2026-06-08 | Published 2026-06-10 | Updated 2026-06-10 | Assigner OpenVPN




MEDIUM: 5.6CVSS:4.0/AV:L/AC:H/AT:P/PR:L/UI:P/VC:N/VI:N/VA:H/SC:N/SI:N/SA:H

Problem types

CWE-131 Incorrect calculation of buffer size

CWE-122 Heap-based buffer overflow

CWE-787 Out-of-bounds write

Product status

Default status
unaffected

2.0.0 (semver)
affected

References

github.com/OpenVPN/ovpn-dco-win/releases product

community.openvpn.net/Security Announcements/CVE-2026-11604 vendor-advisory

cve.org (CVE-2026-11604)

nvd.nist.gov (CVE-2026-11604)

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