CVE-2026-11604

Heap Buffer Overflow in OpenVPN ovpn-dco-win Leading to System Crash

Published Jun 10, 2026 CVSS 4.0 · 5.6 Medium EPSS < 1% KEV · Not listed
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).

Remediation

No solution or workaround provided in the CVE record

Tracking

Sign in to view the affected projects.

Advisories

No advisories available
History
Type Values Removed Values Added
CPEs cpe:2.3:a:openvpn:openvpn:*:*:*:*:*:*:*:* cpe:2.3:a:openvpn:ovpn-dco-win:*:*:*:*:*:*:*:*
Vendors & Products Openvpn openvpn
Type Values Removed Values Added
First Time appeared Openvpn openvpn
CPEs cpe:2.3:a:openvpn:openvpn:*:*:*:*:*:*:*:*
Vendors & Products Openvpn openvpn
Metrics cvssV3_1

{'score': 6.5, 'vector': 'CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H'}

Type Values Removed Values Added
Metrics ssvc

{'options': {'Automatable': 'no', 'Exploitation': 'none', 'Technical Impact': 'partial'}, 'version': '2.0.3'}

Type Values Removed Values Added
Title Heap Buffer Overflow in OpenVPN ovpn-dco-win Leading to System Crash
First Time appeared Openvpn
Openvpn ovpn-dco-win
Vendors & Products Openvpn
Openvpn ovpn-dco-win
Type Values Removed Values Added
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).
Weaknesses CWE-122
CWE-131
CWE-787
References
Metrics cvssV4_0

{'score': 5.6, 'vector': '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'}

Weaknesses

Sources

Status
PUBLISHED
Assigner
OpenVPN
Published
Updated
Jun 11, 2026, 1:27 PM
Reserved
Jun 8, 2026, 3:19 PM
Status
Analyzed
Published
Jun 10, 2026, 10:16 PM
Modified
Sep 24, 2026, 2:39 PM