Improper synchronization in the OpenVPN ovpn-dco-win for Windows versions 0.6.5 through 1.3.5 and 2.4.0 through 2.8.7 allows local attackers to trigger a deadlock via a crafted write to the ovpn-dco device, causing the host to become unresponsive.

Metrics

Attack Vector Local

Attack Complexity Low

Privileges Required None

Attack Requirements None

User Interaction None

Vulnerable System Confidentiality Impact None

Vulnerable System Integrity Impact None

Vulnerable System Availability Impact High

Subsequent System Confidentiality Impact None

Subsequent System Integrity Impact None

Subsequent System Availability Impact None

No CVSS v3.1

No CVSS v3.0

No CVSS v2

This CVE is not in the KEV list.

The EPSS score is 0.00113.

Key SSVC decision points have not yet been added.

Affected Vendors & Products

No data.

No data.

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No data.

Advisories

No advisories yet.

Fixes

Solution

No solution given by the vendor.

Workaround

No workaround given by the vendor.

References
Link Providers
https://community.openvpn.net/Security%20Announcements/CVE-2026-105390 cve-icon cve-icon
History

Fri, 16 Oct 2026 02:15:00 +0000

Type Values Removed Values Added
Title Local Deadlock in OpenVPN Windows Driver Leads to Denial of Service

Thu, 15 Oct 2026 13:30:00 +0000

Type Values Removed Values Added
Title Deadlock Trigger in OpenVPN Windows Client Device Driver

Wed, 14 Oct 2026 17:45:00 +0000

Type Values Removed Values Added
Title Deadlock Trigger in OpenVPN Windows Client Device Driver

Tue, 13 Oct 2026 23:00:00 +0000

Type Values Removed Values Added
Description Improper synchronization in the OpenVPN ovpn-dco-win for Windows versions 0.6.5 through 1.3.5 and 2.4.0 through 2.8.7 allows local attackers to trigger a deadlock via a crafted write to the ovpn-dco device, causing the host to become unresponsive.
Weaknesses CWE-413
CWE-833
References
Metrics cvssV4_0

{'score': 6.9, 'vector': 'CVSS:4.0/AV:L/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N'}

Projects

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cve-icon MITRE

Status: PUBLISHED

Assigner: OpenVPN

Published:

Updated: 2026-10-14T18:08:12.000Z

Reserved: 2026-10-05T10:34:02.496Z

Link: CVE-2026-105390

cve-icon Vulnrichment

No data.

cve-icon NVD

Status : Awaiting Analysis

Published: 2026-10-13T23:17:26.470

Modified: 2026-10-15T20:38:04.303

Link: CVE-2026-105390

cve-icon Redhat

No data.

cve-icon OpenCVE Enrichment

Updated: 2026-10-16T02:00:16Z

Weaknesses