CVE-2025-14636
📋 TL;DR
This vulnerability in Tenda AX9 routers allows attackers to exploit weak hash functions in the firmware update mechanism via the httpd component. Attackers could potentially upload malicious firmware images, though exploitation requires high complexity. All users of affected Tenda AX9 routers are at risk.
💻 Affected Systems
- Tenda AX9
📦 What is this software?
⚠️ Risk & Real-World Impact
Worst Case
Remote attackers could upload malicious firmware to compromise the router, potentially gaining persistent access, intercepting network traffic, or using it as a foothold into internal networks.
Likely Case
Limited impact due to high exploitation complexity; attackers would need to bypass other security controls to achieve meaningful compromise.
If Mitigated
With proper network segmentation and monitoring, impact would be minimal even if exploited.
🎯 Exploit Status
Exploit details are publicly available but require significant technical skill to weaponize effectively.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: Unknown
Vendor Advisory: https://www.tenda.com.cn/
Restart Required: Yes
Instructions:
1. Check Tenda website for firmware updates. 2. Download latest firmware. 3. Access router admin interface. 4. Navigate to firmware update section. 5. Upload and apply new firmware. 6. Reboot router.
🔧 Temporary Workarounds
Disable Remote Management
allPrevent external access to router administration interface
Network Segmentation
allIsolate router management interface to trusted network segments only
🧯 If You Can't Patch
- Replace affected routers with patched or different models
- Implement strict network access controls to limit exposure of router management interfaces
🔍 How to Verify
Check if Vulnerable:
Check router firmware version in admin interface; if version is 22.03.01.46, device is vulnerable.Check Version:
Check via router web interface or SSH if enabled: cat /proc/version or similar router-specific commandsVerify Fix Applied:
Verify firmware version has been updated to a version later than 22.03.01.46.📡 Detection & Monitoring
Log Indicators:
- Unusual firmware update attempts
- HTTP requests to image_check endpoint with suspicious payloads
Network Indicators:
- Unexpected traffic to router management ports from external sources
- Firmware download attempts from unusual sources
SIEM Query:
source_ip=external AND dest_port=80 AND uri_path CONTAINS 'image_check'