CVE-2025-26692
📋 TL;DR
CVE-2025-26692 is a path traversal vulnerability in Quick Agent V3 and V2 that allows remote unauthenticated attackers to execute arbitrary code with Windows system privileges. This affects all systems running vulnerable versions of Quick Agent software. Successful exploitation gives attackers complete control over affected systems.
💻 Affected Systems
- Quick Agent V3
- Quick Agent V2
⚠️ 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 Windows SYSTEM privileges, enabling data theft, ransomware deployment, lateral movement, and persistent backdoor installation.
Likely Case
Remote code execution leading to malware installation, credential harvesting, and system takeover for botnet participation or data exfiltration.
If Mitigated
Limited impact if network segmentation, strict firewall rules, and endpoint protection prevent exploitation attempts.
🎯 Exploit Status
Path traversal vulnerabilities typically have low exploitation complexity. Remote unauthenticated access makes this highly attractive to attackers.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: Check vendor advisory for specific patched versions
Vendor Advisory: https://siosapps.sios.jp/agent_info/20250425001.html
Restart Required: Yes
Instructions:
1. Review vendor advisory at provided URL. 2. Download and install the latest patched version from official vendor sources. 3. Restart affected systems and services. 4. Verify installation and functionality.
🔧 Temporary Workarounds
Network Segmentation
windowsIsolate Quick Agent systems from untrusted networks using firewall rules
netsh advfirewall firewall add rule name="Block Quick Agent" dir=in action=block protocol=TCP localport=[QUICK_AGENT_PORT]
Access Control
windowsRestrict network access to Quick Agent services to trusted IP addresses only
netsh advfirewall firewall add rule name="Allow Quick Agent" dir=in action=allow protocol=TCP localport=[QUICK_AGENT_PORT] remoteip=[TRUSTED_IPS]
🧯 If You Can't Patch
- Implement strict network segmentation to isolate affected systems from untrusted networks
- Deploy endpoint detection and response (EDR) solutions to monitor for exploitation attempts
🔍 How to Verify
Check if Vulnerable:
Check Quick Agent version against vendor advisory. Vulnerable if running unpatched V2 or V3 versions.Check Version:
Check Quick Agent interface or installation directory for version informationVerify Fix Applied:
Verify installed version matches patched version from vendor advisory and test functionality.📡 Detection & Monitoring
Log Indicators:
- Unusual file access patterns in Quick Agent logs
- Unexpected process creation from Quick Agent service
- Path traversal patterns in request logs
Network Indicators:
- Unusual outbound connections from Quick Agent systems
- Exploit kit traffic patterns
- Command and control beaconing
SIEM Query:
source="quick_agent" AND (event_type="file_access" AND path="..\\" OR event_type="process_create" AND parent_process="quick_agent")