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TI-2026-73747 Aliases CVE-2026-105390GHSA-gwf4-3mjv-q2c9

OpenVPN ovpn-dco-win (Windows): local deadlock, host hangs

Priority LOW 29CWE-413Published · Updated

Key facts

Attack vector
Local
Privileges required
None
User interaction
None
Attack complexity
Low
Attack requirements
None
Impact type
—
Confidentiality · integrity · availability
None · None · High
Fix status
No fix listed

Attack profile from CVSS 4.0 · CNA. Fix status from CNA.

Summary

Improper synchronization in OpenVPN ovpn-dco-win for Windows, versions 0.6.5 through 1.3.5 and 2.4.0 through 2.8.7, lets a local attacker trigger a deadlock with a crafted write to the ovpn-dco device, leaving the host unresponsive. The weakness is classified as CWE-413 (Improper Resource Locking) and CWE-833 (Deadlock). The CNA rates it CVSS 4.0 6.9 (MEDIUM), with high impact on availability only. CISA SSVC marks exploitation as none and automatable as no.

Written with Claude Haiku 5.5 from the sources below · 2026-10-28

Description from the CNA

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.

Why it matters now

Exploitation None reported CISA SSVC · not in CISA KEV
EPSS 0.00113 1st percentileScored 2026-11-07
Fix No fix listed No fixed version in the sources yet

SSVC decision points

CISA ADP · SSVC 2.0.3

Exploitation
None
Automatable
No
Technical impact
Partial

The decision (Track, Attend, Act) also depends on your mission and well-being impact; see CISA's SSVC guide.

Affected products

VendorProductAffected versionsFixed inStatusSource
OpenVPNovpn-dco-win0.6.5 – 1.3.5; 2.4.0 – 2.8.7—No fix listedCNA
  • ovpn-dco-win VendorOpenVPN Affected 0.6.5 – 1.3.5; 2.4.0 – 2.8.7 Fixed in — No fix listed CNA

Remediation

The sources list no fixed version. Restrict local access to systems running ovpn-dco-win until a fix is available, and monitor the vendor advisory for an update.

Written with Claude Haiku 5.5 from the sources below · 2026-10-28

Timeline

  1. 2026-10-14 Threatist record created from CVE-2026-105390
  2. 2026-10-14 Alias added: GHSA-gwf4-3mjv-q2c9
  3. 2026-10-14 Priority changed: MEDIUM → LOW
  4. 2026-10-15 CISA SSVC decision points changed

References

Advisory 1

  • TI-2024-01215 Integer overflow in OpenVPN tap-windows6 CVSS 3.1CRITICAL 9.8
  • TI-2014-04453 Unquoted Windows search path vulnerability in the ptservice service prior to… CVSS 3.1MEDIUM 5.3
  • TI-2022-00467 Authentication bypass in OpenVPN CVSS 3.1CRITICAL 9.8
  • TI-2024-18509 Unrestricted file upload in OpenVPN 2 CVSS 3.1CRITICAL 9.8
  • TI-2024-16468 The interactive service in OpenVPN 2.6.9 and earlier allows the OpenVPN service pipe to… CVSS 3.1HIGH 7.5
  • TI-2023-25309 Use after free in OpenVPN 2 CVSS 3.1CRITICAL 9.8
See all 99 →

Sources

This product uses the NVD API but is not endorsed or certified by the NVD. Sources and licences