CVE-2025-11955

HIGH EPSS 17.2%

Published Oct 27, 20258mo ago · Modified Jun 17, 20261w ago

8.2 CVSS 4.0

High

Published Oct 27, 2025 8mo ago

Last Modified Jun 17, 2026 1w ago

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.

CVSS Details

Base Score

8.2

Exploitability

—

Impact

—

Vector string

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/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X

Attack Vector Network

Attack Complexity High

Privileges Required None

User Interaction None

Scope X

Threat Intelligence

EPSS Exploit Probability

17.2% percentile

Exploit & Patch Status

No Known Exploit

No Patch Available

Weaknesses 1

CWE-299

References 2

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

Remediation

No remediation data recorded yet

Check vendor advisories and the NVD entry for patch availability.