CVE-2025-20109
📋 TL;DR
This vulnerability in Intel processors allows an authenticated user with local access to potentially escalate privileges by exploiting improper isolation in the stream cache mechanism. It affects systems running vulnerable Intel processors, requiring physical or remote desktop access to the target machine. The impact is limited to authenticated users who already have some level of system access.
💻 Affected Systems
- Intel processors with vulnerable stream cache mechanism
⚠️ 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
An authenticated attacker gains full system administrator/root privileges, potentially compromising the entire system and accessing sensitive data or installing persistent malware.
Likely Case
An authenticated user with standard privileges escalates to higher privileges, allowing them to bypass security controls, access restricted data, or modify system configurations.
If Mitigated
With proper access controls and monitoring, exploitation attempts are detected and blocked, limiting the attacker's ability to move laterally or cause significant damage.
🎯 Exploit Status
Exploitation requires authenticated local access and knowledge of processor architecture; no public exploit code is currently available.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: Microcode updates specific to affected processor models
Vendor Advisory: https://intel.com/content/www/us/en/security-center/advisory/intel-sa-01249.html
Restart Required: Yes
Instructions:
1. Check Intel advisory for affected processor models. 2. Obtain microcode update from Intel or system manufacturer. 3. Apply microcode update through BIOS/UEFI update or operating system microcode loader. 4. Reboot system to activate new microcode.
🔧 Temporary Workarounds
Restrict local access
allLimit physical and remote desktop access to trusted users only
Implement privilege separation
allUse principle of least privilege and separate user accounts for different functions
🧯 If You Can't Patch
- Implement strict access controls and monitor for privilege escalation attempts
- Isolate affected systems in separate network segments and limit lateral movement
🔍 How to Verify
Check if Vulnerable:
Check processor model and microcode version using: cat /proc/cpuinfo on Linux or wmic cpu get name,description on Windows, then compare with Intel's affected listCheck Version:
Linux: cat /proc/cpuinfo | grep 'model name' && dmesg | grep 'microcode'; Windows: wmic cpu get name,descriptionVerify Fix Applied:
Verify microcode version after update using: dmesg | grep microcode on Linux or check BIOS/UEFI version in system information📡 Detection & Monitoring
Log Indicators:
- Unexpected privilege escalation events
- Failed authorization attempts followed by successful privileged operations
- Unusual process creation with elevated privileges
Network Indicators:
- Lateral movement from previously low-privilege accounts
- Unexpected administrative access patterns
SIEM Query:
EventID=4688 AND NewProcessName LIKE '%cmd.exe%' OR '%powershell.exe%' AND SubjectUserName NOT IN (admin_users) AND TokenElevationType != '%%1936'