Improper Check for Unusual or Exceptional Conditions in OpenVPN for Windows - #VU157724
Published: October 27, 2026
Vulnerability identifier: #VU157724
CSH Severity: Low
CVSS v4: 6.3 [CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:N/VI:N/VA:L/SC:N/SI:N/SA:N]
CVE-ID: N/A
CWE-ID: CWE-754
Exploitation vector: Remote access
Exploit availability:
No public exploit available
Vulnerability details
The vulnerability allows a remote attacker to disrupt an OpenVPN client's operation.
The vulnerability exists due to improper handling of missing key material in the OpenVPN tls-crypt-v2 handshake when attempting to add a wrapped client key without available key material. A remote attacker can operate a malicious server that triggers this client-side error to prevent the client from working properly.
Affected software
OpenVPN for Windows
Remediation
Install security update from vendor's website.
OpenVPN for Windows - update to 2.7.8