CVE-2026-11604

MEDIUM

Openvpn Ovpn-dco-win < 2.5.8 - Heap-based Buffer Overflow

Title source: rule

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).

References (2)

Core 2

Core References

Product product

https://github.com/OpenVPN/ovpn-dco-win/releases

Vendor Advisory vendor-advisory

https://community.openvpn.net/Security%20Announcements/CVE-2026-11604

Scores

CVSS v4 5.6

EPSS 0.0015

EPSS Percentile 4.4%

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/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

CISA SSVC

Vulnrichment

Exploitation none

Automatable no

Technical Impact partial

Details

CWE

CWE-122 CWE-131 CWE-787

Status published

Products (1)

OpenVPN/ovpn-dco-win 2.0.0 - 2.5.8

Published Jun 10, 2026

Tracked Since Jun 11, 2026