CVE-2025-7945
📋 TL;DR
A critical buffer overflow vulnerability in D-Link DIR-513 routers allows remote attackers to execute arbitrary code by sending specially crafted requests to the /goform/formSetWanDhcpplus endpoint. This affects all DIR-513 routers with firmware up to August 31, 2019. The vulnerability is particularly dangerous because these products are no longer supported by the vendor.
💻 Affected Systems
- D-Link DIR-513
⚠️ Manual Verification Required
This CVE does not have specific version information in our database, so automatic vulnerability detection cannot determine if your system is affected.
Why? The CVE database entry doesn't specify which versions are vulnerable (no version ranges provided by the vendor/NVD).
🔒 Custom verification scripts are available for registered users. Sign up free to download automated test scripts.
- Review the CVE details at NVD
- Check vendor security advisories for your specific version
- Test if the vulnerability is exploitable in your environment
- Consider updating to the latest version as a precaution
⚠️ Risk & Real-World Impact
Worst Case
Remote code execution leading to complete device compromise, persistent backdoor installation, and lateral movement into connected networks.
Likely Case
Remote code execution allowing attackers to modify router settings, intercept network traffic, or use the device as part of a botnet.
If Mitigated
Denial of service or temporary disruption if exploit fails or is detected by network monitoring.
🎯 Exploit Status
Public proof-of-concept code exists on GitHub, making exploitation straightforward for attackers with basic skills.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: N/A
Vendor Advisory: https://www.dlink.com/
Restart Required: No
Instructions:
No official patch available. D-Link has ended support for DIR-513 routers. The only secure solution is to replace affected devices.
🔧 Temporary Workarounds
Disable WAN Management
allDisable remote management interface to prevent external exploitation
Access router admin panel > Advanced > Remote Management > Disable
Network Segmentation
allIsolate DIR-513 routers in separate VLAN with strict firewall rules
🧯 If You Can't Patch
- Immediately replace all affected DIR-513 routers with supported models
- Implement strict network segmentation and firewall rules to limit router exposure
🔍 How to Verify
Check if Vulnerable:
Check router firmware version in admin interface. If version is 20190831 or older, device is vulnerable.Check Version:
curl -s http://router-ip/ | grep -i firmwareVerify Fix Applied:
No fix available. Only verification is confirming device replacement.📡 Detection & Monitoring
Log Indicators:
- HTTP POST requests to /goform/formSetWanDhcpplus with abnormal curTime parameter values
- Router crash/reboot logs
Network Indicators:
- Unusual traffic patterns to router management interface
- Exploit payloads in HTTP requests
SIEM Query:
source="router.logs" AND (uri="/goform/formSetWanDhcpplus" OR "curTime" AND length>100)