Incorrect validation of OCSP certificates in TheGreenBow VPN Client Windows Enterprise
Priority LOW 35CWE-299Published · Updated
Key facts
- Attack vector
- Network
- Privileges required
- None
- User interaction
- None
- Attack complexity
- High
- Attack requirements
- Present
- Impact type
- —
- Confidentiality · integrity · availability
- High · None · None
- Fix status
- No fix listed
Attack profile from CVSS 4.0 · CNA. Fix status from CNA.
Summary
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.
Why it matters now
Exploitation None reported CISA SSVC · not in CISA KEV
EPSS 0.00211 11th percentileScored 2026-11-08
Fix No fix listed No fixed version in the sources yet
SSVC decision points
CISA ADP · SSVC 2.0.3
- Exploitation
- None
- Automatable
- No
- Technical impact
- Partial
The decision (Track, Attend, Act) also depends on your mission and well-being impact; see CISA's SSVC guide.
Affected products
| Vendor | Product | Affected versions | Fixed in | Status | Source |
|---|---|---|---|---|---|
| TheGreenBow | TheGreenBow VPN Client Windows Enterprise | 7.5; 7.6 | — | No fix listed | CNA |
- TheGreenBow VPN Client Windows Enterprise VendorTheGreenBow Affected 7.5; 7.6 Fixed in — No fix listed CNA
Remediation
No fixed version listed by the sources yet.
Timeline
- 2026-10-02 Threatist record created from CVE-2025-11955
- 2026-10-03 Alias added: GHSA-8cw5-pxrw-vqhc
References
More TheGreenBow vulnerabilities
- TI-2010-00372 Stack-based buffer overflow in vpnconf.exe in TheGreenBow IPSec VPN Client 4.51.001… CVSS 2.0HIGH 9.3
- TI-2023-25583 An issue discovered in TheGreenBow Windows Enterprise Certified VPN Client 6.52, Windows… CVSS 3.1CRITICAL 9.8
- TI-2009-02780 The tgbvpn.sys driver in TheGreenBow IPSec VPN Client 4.61.003 allows local users to… CVSS 2.0LOW 2.1
Sources
- CVE-2025-11955 · CVE Program
- CVE-2025-11955 · NVD
- FIRST EPSS
- GHSA-8cw5-pxrw-vqhc · GitHub Advisory Database · CC BY 4.0
This product uses the NVD API but is not endorsed or certified by the NVD. Sources and licences