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Vulnerability record · CVE-2025-11955 · published 27 October 2025

CVE-2025-11955: Incorrect validation of OCSP certificates vulnerability in TheGreenBow VPN, versions 7.5 and 7.6.

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.

8.2 CVSS 4.0 High EPSS 0.21% · top 89.8% CWE-299 · CWE-299 Deferred
8.2CVSS 4.0 base score
0.21%EPSS exploitation probability, 30 days
NoNot in CISA KEV
0Affected product versions listed by NVD
2References
17 Jun 2026Last modified by NVD

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: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:

References

LinkTags
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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Source: NIST National Vulnerability Database (record CVE-2025-11955), CISA KEV, FIRST EPSS (scores of 2026-09-27). This page is refreshed as NVD updates the record.