CVE-2025-52363
📋 TL;DR
Tenda CP3 Pro routers with firmware V22.5.4.93 contain a hardcoded root password hash in system files, allowing attackers who can access the firmware image to potentially crack the password and gain administrative access. This affects users of Tenda CP3 Pro routers running the vulnerable firmware version.
💻 Affected Systems
- Tenda CP3 Pro
📦 What is this software?
⚠️ Risk & Real-World Impact
Worst Case
Attacker gains full administrative control of the router, enabling network traffic interception, device reconfiguration, malware deployment, and lateral movement into connected networks.
Likely Case
Local network attacker or someone with physical access extracts firmware, cracks password hash, and gains persistent administrative access to compromise router functionality.
If Mitigated
Limited to attackers with firmware access; proper network segmentation and access controls prevent exploitation.
🎯 Exploit Status
Exploitation requires firmware extraction and password hash cracking; no authentication bypass needed once hash is obtained.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: Unknown
Vendor Advisory: https://www.tendacn.com/product/download/cp3pro.html
Restart Required: Yes
Instructions:
1. Check Tenda website for firmware updates. 2. Download latest firmware. 3. Upload via router admin interface. 4. Reboot router.
🔧 Temporary Workarounds
Change root password
linuxManually change the root password to a strong, unique value
passwd root
Restrict firmware access
allLimit physical and network access to prevent firmware extraction
🧯 If You Can't Patch
- Isolate vulnerable routers in separate network segments
- Implement strict access controls and monitor for unauthorized configuration changes
🔍 How to Verify
Check if Vulnerable:
Check firmware version in router admin interface or extract /etc/passwd and /etc/passwd- files to look for hardcoded hashesCheck Version:
cat /proc/version or check router web interfaceVerify Fix Applied:
Verify firmware version is updated beyond V22.5.4.93 and check /etc/passwd files for changed hashes📡 Detection & Monitoring
Log Indicators:
- Failed login attempts to root account
- Unexpected firmware extraction activities
- Configuration changes from unknown sources
Network Indicators:
- Unusual SSH/Telnet connections to router
- Firmware download attempts from unauthorized sources
SIEM Query:
source="router_logs" AND (event="failed_login" AND user="root" OR event="firmware_access")