CVE-2026-0838
📋 TL;DR
This is a remote buffer overflow vulnerability in UTT 进取 520W firmware version 1.7.7-180627 that allows attackers to execute arbitrary code by manipulating the SSID parameter. The vulnerability affects users of this specific router model and firmware version. Attackers can exploit this remotely without authentication.
💻 Affected Systems
- UTT 进取 520W
📦 What is this software?
⚠️ Risk & Real-World Impact
Worst Case
Complete system compromise leading to remote code execution, router takeover, network infiltration, and potential lateral movement to connected devices.
Likely Case
Router compromise allowing attackers to intercept network traffic, modify DNS settings, create backdoors, or launch attacks against internal network devices.
If Mitigated
Limited impact if device is behind firewall with strict inbound filtering, though internal network exposure remains if exploited from within.
🎯 Exploit Status
Exploit code is publicly available on GitHub. The vulnerability is straightforward to exploit due to the use of unsafe strcpy function.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: Unknown
Vendor Advisory: None available - vendor did not respond to disclosure
Restart Required: Yes
Instructions:
No official patch available. Consider replacing the device or implementing workarounds.
🔧 Temporary Workarounds
Disable Wireless Functionality
allDisable wireless features to prevent exploitation via SSID manipulation
Access router admin interface -> Wireless Settings -> Disable wireless radio
Network Segmentation
allIsolate the router from critical network segments
Configure VLANs to separate router management traffic
Implement firewall rules to restrict router access
🧯 If You Can't Patch
- Replace the vulnerable router with a different model from a responsive vendor
- Implement strict network access controls and monitor for exploitation attempts
🔍 How to Verify
Check if Vulnerable:
Check router firmware version via admin interface. If version is exactly 1.7.7-180627, the device is vulnerable.Check Version:
Login to router admin interface and check System Information or Firmware Version pageVerify Fix Applied:
No official fix available to verify. If wireless is disabled, verify through admin interface that wireless radio is off.📡 Detection & Monitoring
Log Indicators:
- Unusual wireless configuration changes
- Multiple failed configuration attempts
- Buffer overflow error messages in system logs
Network Indicators:
- Unusual traffic patterns from router
- Unexpected outbound connections from router
- SSID parameter manipulation attempts
SIEM Query:
source="router_logs" AND ("ConfigWirelessBase" OR "buffer overflow" OR "strcpy")