How severe is CVE-2025-11955?

CVE-2025-11955 has a CVSS 4.0 base score of 8.2, rated high severity.

Is CVE-2025-11955 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (11th percentile), an estimate of the probability of exploitation in the next 30 days.

How do I fix CVE-2025-11955?

Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Given its high severity, prioritise patching exposed systems.

Does CVE-2025-11955 have an EU (EUVD) identifier?

Yes. CVE-2025-11955 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2025-36160.

When was CVE-2025-11955 published?

CVE-2025-11955 was published on 2025-10-27 and last updated on 2026-10-08.

CVE-2025-11955

CVE-2025-11955 is a high-severity vulnerability with a CVSS 4.0 base score of 8.2. It is not currently listed as actively exploited by CISA, and its EPSS exploit-prediction score is low. The underlying weakness is classified as CWE-299.

Key facts

Severity: High (CVSS 4.0 base score 8.2)
EPSS exploit prediction: 0% (11th percentile)
Actively exploited: Not listed in CISA KEV
EU (EUVD) id: EUVD-2025-36160
Weakness: CWE-299
Published: 2025-10-27
Last modified: 2026-10-08

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.

Frequently asked questions

What is CVE-2025-11955?: 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.
How severe is CVE-2025-11955?: CVE-2025-11955 has a CVSS 4.0 base score of 8.2, rated high severity.
Is CVE-2025-11955 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (11th percentile), an estimate of the probability of exploitation in the next 30 days.
How do I fix CVE-2025-11955?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Given its high severity, prioritise patching exposed systems.
Does CVE-2025-11955 have an EU (EUVD) identifier?: Yes. CVE-2025-11955 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2025-36160.
When was CVE-2025-11955 published?: CVE-2025-11955 was published on 2025-10-27 and last updated on 2026-10-08.

References

Other CWE-299 vulnerabilities

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CVE-2026-61699 — High (CVSS 8.1): nebula-mesh is a self-hosted control plane for Slack Nebula mesh VPN. Prior to version 0.7.1, revocation is the only…
CVE-2025-3085 — High (CVSS 8.1): A MongoDB server under specific conditions running on Linux with TLS and CRL revocation status checking enabled, fails…
CVE-2026-115570 — High (CVSS 7.4): Electron is a framework for writing cross-platform desktop applications using JavaScript, HTML and CSS. Prior to…
CVE-2026-56821 — High (CVSS 7.4): Netty is an asynchronous, event-driven network application framework. Prior to versions 4.1.136.Final and 4.2.16.Final,…

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