CVE-2025-27932
📋 TL;DR
A path traversal vulnerability in the USB storage file-sharing function of HGW-BL1500HM devices allows attackers to delete arbitrary files or cause denial of service. This affects users of HGW-BL1500HM home gateway routers with vulnerable firmware versions.
💻 Affected Systems
- HGW-BL1500HM
⚠️ 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
Critical system files could be deleted, rendering the device inoperable or allowing persistent compromise if configuration files are manipulated.
Likely Case
Attackers delete user files from USB storage or cause temporary service disruption through targeted file deletion.
If Mitigated
With proper network segmentation and access controls, impact is limited to USB storage functionality only.
🎯 Exploit Status
Exploitation requires access to the file-sharing interface, which may have authentication requirements. Path traversal techniques are well-documented.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: Later than Ver 002.002.003
Vendor Advisory: https://kddi-tech.com/contents/appendix_L2_06.html#64433e4a-8946-9c06-bddf-91cbfe56c8e5
Restart Required: No
Instructions:
1. Log into device management interface
2. Navigate to firmware update section
3. Download and apply latest firmware from vendor
4. Verify version is updated beyond Ver 002.002.003
🔧 Temporary Workarounds
Disable USB file-sharing
allTemporarily disable the vulnerable USB storage file-sharing function
Network segmentation
allIsolate the device from untrusted networks and limit access to file-sharing interface
🧯 If You Can't Patch
- Disable USB storage file-sharing functionality entirely
- Implement strict network access controls to limit who can reach the file-sharing interface
🔍 How to Verify
Check if Vulnerable:
Check firmware version in device management interface. If version is 002.002.003 or earlier and USB file-sharing is enabled, device is vulnerable.Check Version:
Check via web interface: System Information > Firmware VersionVerify Fix Applied:
Confirm firmware version is later than 002.002.003 in device management interface.📡 Detection & Monitoring
Log Indicators:
- Unusual file deletion patterns in USB storage logs
- Multiple failed path traversal attempts in access logs
Network Indicators:
- Unusual traffic patterns to file-sharing service ports
- Requests containing '../' sequences in URLs
SIEM Query:
source="router_logs" AND ("file deletion" OR "../" OR "path traversal")