CVE-2025-45864
📋 TL;DR
This CVE describes a buffer overflow vulnerability in TOTOLINK A3002R routers via the addrPoolStart parameter in the formDhcpv6s interface. Attackers could potentially execute arbitrary code or crash the device. Only users of the specific TOTOLINK router model and firmware version are affected.
💻 Affected Systems
- TOTOLINK A3002R
📦 What is this software?
⚠️ Risk & Real-World Impact
Worst Case
Remote code execution leading to complete device compromise, allowing attackers to intercept traffic, modify configurations, or use the device as a botnet node.
Likely Case
Denial of service causing router crashes and network disruption, requiring physical reset or manual intervention.
If Mitigated
Limited impact if the vulnerable interface is not exposed to untrusted networks and proper network segmentation is in place.
🎯 Exploit Status
The GitHub reference contains technical details and proof-of-concept information. Buffer overflow vulnerabilities in network devices are commonly weaponized.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: Unknown
Vendor Advisory: https://www.totolink.net/home/menu/detail/menu_listtpl/download/id/258/ids/36.html
Restart Required: Yes
Instructions:
1. Check vendor website for firmware updates. 2. Download latest firmware. 3. Access router admin interface. 4. Navigate to firmware upgrade section. 5. Upload and apply new firmware. 6. Wait for router to reboot.
🔧 Temporary Workarounds
Disable IPv6 DHCP Server
allDisable the vulnerable DHCPv6 server functionality if not required.
Restrict Web Interface Access
allLimit access to router administration interface to trusted IP addresses only.
🧯 If You Can't Patch
- Segment affected routers on isolated network segments
- Implement strict firewall rules to block external access to router administration interfaces
🔍 How to Verify
Check if Vulnerable:
Check router firmware version via admin interface. Navigate to System > Firmware Upgrade to view current version.Check Version:
No CLI command available. Must check via web interface at System > Firmware Upgrade.Verify Fix Applied:
Verify firmware version has been updated to a version newer than v4.0.0-B20230531.1404.📡 Detection & Monitoring
Log Indicators:
- Multiple failed login attempts
- Unusual configuration changes
- Router crash/reboot events
Network Indicators:
- Unusual traffic patterns to router administration port
- Malformed DHCPv6 requests
SIEM Query:
source="router_logs" AND (event="crash" OR event="reboot") AND device_model="A3002R"