VDB-330118 · CVE-2025-11955 · GCVE-0-2025-11955

TheGreenBow VPN Client Windows Enterprise 7.5/7.6 OCSP Certificate improper check for certificate revocation

CVSS Meta Temp Score CVSS is a standardized scoring system to determine possibilities of attacks. The Temp Score considers temporal factors like disclosure, exploit and countermeasures. The unique Meta Score calculates the average score of different sources to provide a normalized scoring system.	Current Exploit Price (≈) Our analysts are monitoring exploit markets and are in contact with vulnerability brokers. The range indicates the observed or calculated exploit price to be seen on exploit markets. A good indicator to understand the monetary effort required for and the popularity of an attack.	CTI Interest Score Our Cyber Threat Intelligence team is monitoring different web sites, mailing lists, exploit markets and social media networks. The CTI Interest Score identifies the interest of attackers and the security community for this specific vulnerability in real-time. A high score indicates an elevated risk to be targeted for this vulnerability.
3.7	$0-$5k	0.00

Summaryinfo

A vulnerability described as problematic has been identified in TheGreenBow VPN Client Windows Enterprise 7.5/7.6. This affects an unknown function of the component OCSP Certificate Handler. Executing a manipulation can lead to improper check for certificate revocation. This vulnerability appears as CVE-2025-11955. The attack may be performed from remote. There is no available exploit.

Detailsinfo

A vulnerability was found in TheGreenBow VPN Client Windows Enterprise 7.5/7.6. It has been declared as problematic. This vulnerability affects an unknown code block of the component OCSP Certificate Handler. The manipulation with an unknown input leads to a improper check for certificate revocation vulnerability. The CWE definition for the vulnerability is CWE-299. The product does not check or incorrectly checks the revocation status of a certificate, which may cause it to use a certificate that has been compromised. As an impact it is known to affect confidentiality. CVE summarizes:

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.

The advisory is available at incibe.es. This vulnerability was named CVE-2025-11955 since 10/20/2025. The exploitation appears to be difficult. The attack can be initiated remotely. No form of authentication is required for a successful exploitation. The technical details are unknown and an exploit is not available. This vulnerability is assigned to T1557.003 by the MITRE ATT&CK project.

There is no information about possible countermeasures known. It may be suggested to replace the affected object with an alternative product.

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Productinfo

Type

Network Encryption Software

Vendor

TheGreenBow

Name

VPN Client Windows Enterprise

Version

CPE 2.3info

CPE 2.2info

CVSSv4info

VulDB Vector: 🔒
VulDB Reliability: 🔍

CNA CVSS-B Score: 🔒
CNA CVSS-BT Score: 🔒
CNA Vector: 🔒

CVSSv3info

VulDB Meta Base Score: 3.7
VulDB Meta Temp Score: 3.7

VulDB Base Score: 3.7
VulDB Temp Score: 3.7
VulDB Vector: 🔒
VulDB Reliability: 🔍

CVSSv2info

AV	AC	Au	C	I	A
💳	💳	💳	💳	💳	💳
💳	💳	💳	💳	💳	💳
💳	💳	💳	💳	💳	💳

Vector	Complexity	Authentication	Confidentiality	Integrity	Availability
Unlock	Unlock	Unlock	Unlock	Unlock	Unlock
Unlock	Unlock	Unlock	Unlock	Unlock	Unlock
Unlock	Unlock	Unlock	Unlock	Unlock	Unlock

VulDB Base Score: 🔒
VulDB Temp Score: 🔒
VulDB Reliability: 🔍

Exploitinginfo

Class: Improper check for certificate revocation
CWE: CWE-299 / CWE-298 / CWE-295
CAPEC: 🔒
ATT&CK: 🔒

Physical: No
Local: No
Remote: Yes

Availability: 🔒
Status: Not defined

EPSS Score: 🔒
EPSS Percentile: 🔒

Price Prediction: 🔍
Current Price Estimation: 🔒

0-Day	Unlock	Unlock	Unlock	Unlock
Today	Unlock	Unlock	Unlock	Unlock

Threat Intelligenceinfo

Interest: 🔍
Active Actors: 🔍
Active APT Groups: 🔍

Countermeasuresinfo

Recommended: no mitigation known
Status: 🔍

0-Day Time: 🔒

Timelineinfo

10/20/2025 CVE reserved
10/27/2025 +7 days Advisory disclosed
10/27/2025 +0 days VulDB entry created
10/27/2025 +0 days VulDB entry last update

Sourcesinfo

Advisory: incibe.es
Status: Not defined

CVE: CVE-2025-11955 (🔒)
GCVE (CVE): GCVE-0-2025-11955
GCVE (VulDB): GCVE-100-330118

Entryinfo

Created: 10/27/2025 13:21
Changes: 10/27/2025 13:21 (65)
Complete: 🔍
Cache ID: 216::103