CVE-2025-65001
📋 TL;DR
This vulnerability in Fujitsu fbiosdrv.sys driver allows attackers to write beyond allocated memory boundaries, potentially leading to privilege escalation, system crashes, or arbitrary code execution. It affects systems running vulnerable versions of Fujitsu BIOS driver software. The high CVSS score indicates significant security impact.
💻 Affected Systems
- Fujitsu fbiosdrv.sys driver
⚠️ Manual Verification Required
This CVE does not have specific version information in our database, so automatic vulnerability detection cannot determine if your system is affected.
Why? The CVE database entry doesn't specify which versions are vulnerable (no version ranges provided by the vendor/NVD).
🔒 Custom verification scripts are available for registered users. Sign up free to download automated test scripts.
- Review the CVE details at NVD
- Check vendor security advisories for your specific version
- Test if the vulnerability is exploitable in your environment
- Consider updating to the latest version as a precaution
⚠️ Risk & Real-World Impact
Worst Case
Complete system compromise with kernel-level privilege escalation, allowing attackers to install persistent malware, steal sensitive data, or render systems inoperable.
Likely Case
Local privilege escalation enabling attackers to gain administrative rights on compromised systems, potentially leading to lateral movement within networks.
If Mitigated
Limited impact with proper access controls, but still presents risk of denial-of-service or limited privilege escalation if exploited.
🎯 Exploit Status
Requires local access to system; exploitation involves memory corruption techniques.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: 2.5.0.0 or later
Vendor Advisory: https://security.ts.fujitsu.com/ProductSecurity/content/FsasTech-PSIRT-FTI-FCCL-2025-072319-Security-Notice.pdf
Restart Required: Yes
Instructions:
1. Download updated driver from Fujitsu support portal. 2. Install the update. 3. Restart system to complete installation.
🔧 Temporary Workarounds
Driver Removal
windowsRemove vulnerable fbiosdrv.sys driver if not required for system functionality
sc stop fbiosdrv
sc delete fbiosdrv
del C:\Windows\System32\drivers\fbiosdrv.sys
Access Restriction
windowsRestrict access to driver using Windows security policies
icacls C:\Windows\System32\drivers\fbiosdrv.sys /deny *S-1-1-0:(RX)
🧯 If You Can't Patch
- Implement strict access controls to limit local user privileges
- Monitor for unusual driver activity or privilege escalation attempts
🔍 How to Verify
Check if Vulnerable:
Check driver version in Device Manager under System devices or run: powershell Get-WmiObject Win32_PnPSignedDriver | Where-Object {$_.DeviceName -like '*fbiosdrv*'} | Select-Object DeviceName, DriverVersionCheck Version:
powershell Get-WmiObject Win32_PnPSignedDriver | Where-Object {$_.DeviceName -like '*fbiosdrv*'} | Select-Object DriverVersionVerify Fix Applied:
Verify driver version is 2.5.0.0 or higher using same command📡 Detection & Monitoring
Log Indicators:
- Unexpected driver loads or crashes in System logs
- Privilege escalation events in Security logs
- Driver-related errors in Application logs
Network Indicators:
- Unusual outbound connections following local privilege escalation
- Lateral movement attempts from affected systems
SIEM Query:
EventID=7036 AND (ServiceName='fbiosdrv' OR ServiceName LIKE '%fbios%') OR EventID=4624 AND PrivilegeList LIKE '%SeDebugPrivilege%'