CVE-2025-15541
📋 TL;DR
This vulnerability in TP-Link VX800v v1.0 SFTP service allows authenticated attackers on the same network to create symbolic links that bypass directory restrictions, potentially accessing sensitive system files. Only users with SFTP access to affected devices are impacted, but the attack requires network adjacency.
💻 Affected Systems
- TP-Link VX800v
⚠️ 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
Attackers could read sensitive system files containing credentials, configuration data, or cryptographic keys, potentially leading to full device compromise.
Likely Case
Attackers with SFTP credentials can access files outside the intended directory, potentially reading configuration files or other sensitive data.
If Mitigated
With proper network segmentation and access controls, impact is limited to isolated network segments with minimal sensitive data exposure.
🎯 Exploit Status
Requires authenticated SFTP access and ability to create symbolic links, which is typically available to SFTP users.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: Check TP-Link support site for latest firmware
Vendor Advisory: https://www.tp-link.com/us/support/faq/4930/
Restart Required: Yes
Instructions:
1. Visit TP-Link support page for VX800v. 2. Download latest firmware. 3. Log into device web interface. 4. Navigate to System Tools > Firmware Upgrade. 5. Upload and install new firmware. 6. Device will reboot automatically.
🔧 Temporary Workarounds
Disable SFTP Service
allTemporarily disable SFTP service if not required for operations
Check device web interface under Services or File Sharing settings
Restrict SFTP Access
allLimit SFTP access to specific trusted IP addresses only
Configure firewall rules on device or upstream firewall to restrict SFTP port (typically 22) access
🧯 If You Can't Patch
- Segment network to isolate VX800v devices from untrusted systems
- Implement strict access controls and monitor SFTP logs for unusual activity
🔍 How to Verify
Check if Vulnerable:
Check firmware version in device web interface under System Tools > Firmware VersionCheck Version:
Check via web interface or SSH if enabled: show version or similar commandVerify Fix Applied:
Verify firmware version matches latest version from TP-Link support site and test SFTP symbolic link creation restrictions📡 Detection & Monitoring
Log Indicators:
- Multiple failed SFTP login attempts
- SFTP sessions accessing unusual file paths
- Symbolic link creation in SFTP logs
Network Indicators:
- Unusual SFTP traffic patterns from internal sources
- SFTP connections attempting to access system directories
SIEM Query:
source="vx800v_logs" AND (event="sftp_access" AND path="*system*" OR event="symlink_creation")