CVE-2026-0841
📋 TL;DR
This vulnerability allows remote attackers to execute arbitrary code on UTT 进取 520W routers running version 1.7.7-180627. Attackers can exploit a buffer overflow in the formPictureUrl function by manipulating the importpictureurl parameter. Organizations using these routers are at risk of complete system compromise.
💻 Affected Systems
- UTT 进取 520W router
📦 What is this software?
⚠️ Risk & Real-World Impact
Worst Case
Remote code execution leading to full router compromise, credential theft, network pivoting, and persistent backdoor installation.
Likely Case
Router takeover enabling traffic interception, DNS manipulation, and network disruption.
If Mitigated
Limited impact if routers are behind firewalls with strict inbound filtering and network segmentation.
🎯 Exploit Status
Public exploit code exists on GitHub, making exploitation straightforward for attackers.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: Unknown
Vendor Advisory: None available
Restart Required: Yes
Instructions:
No official patch available. Consider replacing affected routers with supported alternatives.
🔧 Temporary Workarounds
Network Access Control
linuxRestrict access to router management interface using firewall rules
iptables -A INPUT -p tcp --dport 80 -s trusted_network -j ACCEPT
iptables -A INPUT -p tcp --dport 80 -j DROP
Disable Vulnerable Function
linuxBlock access to the vulnerable /goform/formPictureUrl endpoint
iptables -A INPUT -p tcp --dport 80 -m string --string "/goform/formPictureUrl" --algo bm -j DROP
🧯 If You Can't Patch
- Isolate affected routers in dedicated VLAN with strict egress filtering
- Implement network monitoring for exploitation attempts and anomalous router behavior
🔍 How to Verify
Check if Vulnerable:
Check router firmware version via web interface or SSH: cat /etc/versionCheck Version:
cat /etc/version 2>/dev/null || grep firmware /proc/cpuinfoVerify Fix Applied:
No fix available to verify. Monitor for replacement with secure alternative.📡 Detection & Monitoring
Log Indicators:
- Unusual POST requests to /goform/formPictureUrl
- Large payloads in importpictureurl parameter
- Router reboot or crash logs
Network Indicators:
- HTTP requests with oversized importpictureurl values
- Unusual outbound connections from router
SIEM Query:
source="router_logs" AND (uri_path="/goform/formPictureUrl" OR parameter="importpictureurl")