What’s Vulnerable › Vulnerabilities

CVE-2025-11955: Incorrect validation of OCSP certificates in TheGreenBow VPN Client Windows Enterprise

• Severity: high (CVSS 8.2 v4.0)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 0.2% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2025-10-27 · updated 2026-10-08
• Weakness: CWE-299

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.

Affected products

• TheGreenBow VPN Client Windows Enterprise: 7.5, 7.6

References

• https://www.incibe.es/en/incibe-cert/notices/aviso/incorrect-validation-ocsp-certificates-thegreenbow-vpn-client-windows
• https://www.thegreenbow.com/en/support/security-alerts/

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