CVE-2025-11955 Incorrect validation of OCSP certificates in TheGreenBow VPN Client Windows Enterprise
Attackers can bypass OCSP certificate validation in TheGreenBow VPN Client, allowing connections with invalid or missing revocation status.
- Exploited in the wild
- Not known
- Login needed
- Not needed
- Attackable
- Over the internet
- Victim action needed
- Not needed
- Fix
- None listed
What is CVE-2025-11955?
CVE-2025-11955 is a high-severity vulnerability in TheGreenBow VPN Client Windows Enterprise, published on 27 Oct 2025. An attacker can exploit it over the internet without logging in, with no action from the victim.
Official description
Incorrect validation of OCSP certificates vulnerability in TheGreenBow VPN, versions 7.5 and 7.6. During the IKEv2 authentication step, the OCSP-enabled VPN client establishes the tunnel even if it does not receive an OCSP response or if the OCSP response signature is invalid.
Weakness: CWE-299
Which versions are affected by CVE-2025-11955?
How do I fix CVE-2025-11955?
No fix has been published for CVE-2025-11955 yet. Limit exposure of the affected software until one is available.
Is CVE-2025-11955 being exploited?
There is no known exploitation of CVE-2025-11955 in the wild and no public exploit code.
Sources
Also known as GHSA-8cw5-pxrw-vqhc.