CVE-2025-25230
📋 TL;DR
CVE-2025-25230 is a local privilege escalation vulnerability in Omnissa Horizon Client for Windows. An attacker with local access to a system where the vulnerable client is installed can elevate their privileges to higher levels. This affects Windows systems running vulnerable versions of the Horizon Client.
💻 Affected Systems
- Omnissa Horizon Client for Windows
⚠️ 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 attacker gains SYSTEM-level privileges on the compromised Windows machine, enabling complete system takeover, credential theft, lateral movement, and persistence establishment.
Likely Case
An authenticated low-privilege user or malware with initial access escalates to administrator privileges, allowing installation of additional malware, disabling security controls, and accessing sensitive data.
If Mitigated
With proper endpoint security controls, least privilege principles, and network segmentation, impact is limited to the local machine with reduced lateral movement capability.
🎯 Exploit Status
Requires local access to the system; exploitation complexity is typically low for local privilege escalation vulnerabilities once the vulnerability details are understood.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: Check vendor advisory for specific patched versions
Vendor Advisory: https://www.omnissa.com/omnissa-security-response/
Restart Required: Yes
Instructions:
1. Review Omnissa security advisory OMSA-2025-0001. 2. Download and install the latest patched version of Horizon Client for Windows from official Omnissa sources. 3. Restart the system to ensure patch is fully applied.
🔧 Temporary Workarounds
Remove or restrict Horizon Client
windowsUninstall Horizon Client from non-essential systems or restrict its use to minimize attack surface
Control Panel > Programs > Uninstall a program > Select Omnissa Horizon Client > Uninstall
Apply least privilege principles
windowsEnsure users operate with minimal necessary privileges to limit impact of privilege escalation
🧯 If You Can't Patch
- Implement strict endpoint security controls including application whitelisting and behavioral monitoring
- Segment networks to limit lateral movement from compromised endpoints
🔍 How to Verify
Check if Vulnerable:
Check installed Horizon Client version against vulnerable versions listed in vendor advisory OMSA-2025-0001Check Version:
Check program version in Control Panel > Programs > Programs and Features, or run: wmic product where name="Omnissa Horizon Client" get versionVerify Fix Applied:
Verify Horizon Client version matches or exceeds patched version specified in vendor advisory📡 Detection & Monitoring
Log Indicators:
- Unexpected privilege escalation events in Windows Security logs (Event ID 4672, 4688)
- Suspicious Horizon Client process behavior or unexpected child processes
Network Indicators:
- Unusual outbound connections from Horizon Client processes post-exploitation
SIEM Query:
EventID=4672 OR EventID=4688 | where ProcessName contains "Horizon" | where NewProcessName contains privileged commands