CVE-2025-11955

Incorrect validation of OCSP certificates in TheGreenBow VPN Client Windows Enterprise

Published Oct 27, 2025 CVSS 4.0 · 8.2 High EPSS < 1% KEV · Not listed
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.

Remediation

Vendor Solution

The feature that was vulnerable has been removed in the next minor version (version 7.7). It will be properly reintroduced in the next major version. To verify certificate revocation, it is recommended to use the CRL verification function of VPN clients.

Tracking

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Advisories

No advisories available
History
Type Values Removed Values Added
First Time appeared Microsoft
Microsoft windows
Thegreenbow
Thegreenbow ipsec Vpn Client
Thegreenbow thegreenbow Vpn Client
Thegreenbow vpn Client Linux
Thegreenbow windows Enterprise Certified Vpn
Thegreenbow windows Enterprise Vpn
Vendors & Products Microsoft
Microsoft windows
Thegreenbow
Thegreenbow ipsec Vpn Client
Thegreenbow thegreenbow Vpn Client
Thegreenbow vpn Client Linux
Thegreenbow windows Enterprise Certified Vpn
Thegreenbow windows Enterprise Vpn
Type Values Removed Values Added
Metrics ssvc

{'options': {'Automatable': 'no', 'Exploitation': 'none', 'Technical Impact': 'partial'}, 'version': '2.0.3'}

Type Values Removed Values Added
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.
Title Incorrect validation of OCSP certificates in TheGreenBow VPN Client Windows Enterprise
Weaknesses CWE-299
References
Metrics cvssV4_0

{'score': 8.2, 'vector': 'CVSS:4.0/AV:N/AC:H/AT:P/PR:N/UI:N/VC:H/VI:N/VA:N/SC:N/SI:N/SA:N'}

Weaknesses

Sources

Status
PUBLISHED
Assigner
INCIBE
Published
Updated
Oct 27, 2025, 1:19 PM
Reserved
Oct 20, 2025, 11:57 AM
Status
Deferred
Published
Oct 27, 2025, 12:15 PM
Modified
Oct 8, 2026, 11:10 AM