CVE-2025-7910
📋 TL;DR
A critical stack-based buffer overflow vulnerability in D-Link DIR-513 routers allows remote attackers to execute arbitrary code by exploiting the sprintf function in the Boa webserver. This affects all DIR-513 routers running firmware version 1.10. The vulnerability is particularly dangerous because these products are no longer supported by the vendor.
💻 Affected Systems
- D-Link DIR-513
📦 What is this software?
⚠️ Risk & Real-World Impact
Worst Case
Remote code execution leading to complete device compromise, persistence installation, and use as a foothold for lateral movement in the network.
Likely Case
Remote code execution allowing attackers to modify router settings, intercept traffic, or use the device in botnets.
If Mitigated
Limited impact if device is isolated from internet and critical networks, though local network attacks remain possible.
🎯 Exploit Status
Exploit details are publicly available on GitHub. The vulnerability requires no authentication and has straightforward exploitation.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: None
Vendor Advisory: https://www.dlink.com/
Restart Required: No
Instructions:
No official patch available. D-Link has ended support for DIR-513. Immediate replacement is recommended.
🔧 Temporary Workarounds
Disable WAN Management
allDisable remote management interface to prevent external exploitation
Access router admin interface > Advanced > Remote Management > Disable
Network Segmentation
allIsolate DIR-513 devices in separate VLAN with strict firewall rules
🧯 If You Can't Patch
- Immediately replace DIR-513 routers with supported models
- Implement strict network segmentation and firewall rules to limit device access
🔍 How to Verify
Check if Vulnerable:
Check router firmware version via admin interface or by accessing http://[router-ip]/goform/formSetWanNonLogin with curlCheck Version:
curl -s http://[router-ip]/ | grep -i 'firmware' or check admin interfaceVerify Fix Applied:
No fix available. Verify replacement with supported hardware.📡 Detection & Monitoring
Log Indicators:
- Unusual POST requests to /goform/formSetWanNonLogin
- Large payloads in curTime parameter
- Webserver crash logs
Network Indicators:
- HTTP POST requests to /goform/formSetWanNonLogin with crafted curTime parameter
- Unusual outbound connections from router
SIEM Query:
source="router_logs" AND uri="/goform/formSetWanNonLogin" AND (param="curTime" AND length(value)>100)