CVE-2025-28032
📋 TL;DR
This CVE describes a pre-authentication buffer overflow vulnerability in multiple TOTOLINK router models. Attackers can exploit this by sending specially crafted requests to the setNoticeCfg function via the IpForm parameter without authentication, potentially allowing remote code execution. All users running the specified vulnerable firmware versions on affected TOTOLINK router models are at risk.
💻 Affected Systems
- TOTOLINK A800R
- TOTOLINK A810R
- TOTOLINK A830R
- TOTOLINK A950RG
- TOTOLINK A3000RU
- TOTOLINK A3100R
📦 What is this software?
⚠️ Risk & Real-World Impact
Worst Case
Remote code execution leading to complete device compromise, persistence establishment, network pivoting, and data exfiltration.
Likely Case
Device crash/reboot causing denial of service, or limited code execution allowing configuration changes and network monitoring.
If Mitigated
Denial of service only if exploit attempts are blocked, with no code execution due to memory protections.
🎯 Exploit Status
The vulnerability requires no authentication and has public proof-of-concept available, making exploitation straightforward for attackers.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: Unknown
Vendor Advisory: Not available
Restart Required: Yes
Instructions:
1. Check TOTOLINK website for firmware updates. 2. Download appropriate firmware for your model. 3. Access router admin interface. 4. Navigate to firmware upgrade section. 5. Upload new firmware file. 6. Wait for reboot and verify version.
🔧 Temporary Workarounds
Disable WAN Management
allPrevent external access to router web interface by disabling remote administration.
Network Segmentation
allIsolate affected routers in separate VLANs with strict firewall rules.
🧯 If You Can't Patch
- Replace affected routers with different models from vendors with better security track records
- Implement strict network access controls to limit traffic to router management interfaces
🔍 How to Verify
Check if Vulnerable:
Check router firmware version via admin interface and compare with affected versions list.Check Version:
Login to router web interface and check System Status or Firmware Upgrade section.Verify Fix Applied:
Verify firmware version has been updated to a version not listed in affected versions.📡 Detection & Monitoring
Log Indicators:
- Multiple failed HTTP POST requests to setNoticeCfg endpoint
- Unusual traffic patterns to router management interface
- Router reboot/crash logs
Network Indicators:
- HTTP POST requests with unusually long IpForm parameter values
- Traffic to router web interface from unexpected sources
SIEM Query:
source="router_logs" AND (uri="/cgi-bin/setNoticeCfg" OR uri="*/setNoticeCfg") AND method="POST" AND size>1000