CVE-2022-25550
📋 TL;DR
A stack overflow vulnerability in Tenda AX1806 routers allows attackers to cause Denial of Service by sending specially crafted deviceName parameters to the saveParentControlInfo function. This affects Tenda AX1806 v1.0.0.1 devices, potentially disrupting network connectivity for users.
💻 Affected Systems
- Tenda AX1806
📦 What is this software?
⚠️ Risk & Real-World Impact
Worst Case
Complete device crash requiring physical reboot, persistent network outage until manual intervention.
Likely Case
Temporary service disruption, router reboot needed to restore functionality.
If Mitigated
Limited impact with proper network segmentation and access controls preventing exploitation.
🎯 Exploit Status
Public proof-of-concept available in GitHub repositories; exploitation requires network access to vulnerable interface.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: Unknown
Vendor Advisory: Not available
Restart Required: No
Instructions:
No official patch available. Check Tenda website for firmware updates addressing CVE-2022-25550.
🔧 Temporary Workarounds
Disable Parent Control Feature
allTurn off parent control functionality to remove vulnerable code path.
Access router admin interface > Parental Controls > Disable
Restrict Network Access
linuxBlock external access to router admin interface using firewall rules.
iptables -A INPUT -p tcp --dport 80 -j DROP
iptables -A INPUT -p tcp --dport 443 -j DROP
🧯 If You Can't Patch
- Segment vulnerable devices on isolated network segments
- Implement strict network access controls to limit exposure
🔍 How to Verify
Check if Vulnerable:
Check router firmware version in admin interface; if version is v1.0.0.1, device is vulnerable.Check Version:
curl -s http://router-ip/status | grep versionVerify Fix Applied:
Verify firmware version has been updated beyond v1.0.0.1 or parent control feature is disabled.📡 Detection & Monitoring
Log Indicators:
- Repeated connection attempts to parent control endpoint
- Router reboot events following malformed requests
Network Indicators:
- Unusual HTTP POST requests to saveParentControlInfo endpoint with long deviceName parameters
SIEM Query:
source="router.log" AND "saveParentControlInfo" AND deviceName.length>100