CVE-2025-25892
📋 TL;DR
A buffer overflow vulnerability in D-Link DSL-3782 routers allows attackers to cause Denial of Service (DoS) by sending specially crafted packets containing malicious values in the sstartip, sendip, dstartip, and dendip parameters. This affects users of D-Link DSL-3782 routers running vulnerable firmware versions. The vulnerability can disrupt network connectivity for affected devices.
💻 Affected Systems
- D-Link DSL-3782
📦 What is this software?
⚠️ Risk & Real-World Impact
Worst Case
Complete device crash requiring physical reboot, extended network downtime, and potential for remote code execution if the buffer overflow can be leveraged beyond DoS.
Likely Case
Temporary DoS causing device reboot or service interruption, disrupting internet connectivity for connected users.
If Mitigated
No impact if devices are patched or network controls prevent malicious packets from reaching vulnerable devices.
🎯 Exploit Status
Exploit details are publicly available in the provided GitHub references, making exploitation straightforward for attackers with basic networking knowledge.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: Unknown
Vendor Advisory: Unknown
Restart Required: Yes
Instructions:
1. Check D-Link's official website or support portal for firmware updates. 2. If an update is available, download the firmware file. 3. Access the router's web interface. 4. Navigate to the firmware update section. 5. Upload and apply the new firmware. 6. Reboot the router after the update completes.
🔧 Temporary Workarounds
Network Segmentation
allIsolate vulnerable routers from untrusted networks to limit exposure.
Firewall Rules
allBlock external access to the router's management interface and restrict incoming packets to necessary services only.
🧯 If You Can't Patch
- Replace vulnerable devices with supported models that receive security updates.
- Monitor network traffic for anomalous packets targeting the sstartip, sendip, dstartip, and dendip parameters.
🔍 How to Verify
Check if Vulnerable:
Check the router's firmware version via the web interface or CLI; if it matches v1.01, it is vulnerable.Check Version:
Log into the router's web interface and navigate to the status or system information page to view the firmware version.Verify Fix Applied:
After updating, verify the firmware version has changed from v1.01 to a newer, patched version.📡 Detection & Monitoring
Log Indicators:
- Router crash logs, reboot events, or error messages related to buffer overflow in system logs.
Network Indicators:
- Unusual packets with crafted values in sstartip, sendip, dstartip, or dendip fields directed at the router's IP.
SIEM Query:
source_ip:external AND dest_ip:router_ip AND (packet_content:"sstartip" OR packet_content:"sendip" OR packet_content:"dstartip" OR packet_content:"dendip")