CVE-2025-2620
📋 TL;DR
A critical stack-based buffer overflow vulnerability in D-Link DAP-1620's authentication handler allows remote attackers to execute arbitrary code or crash the device. This affects DAP-1620 firmware version 1.03 specifically. The vulnerability is particularly dangerous because these devices are no longer supported by the vendor.
💻 Affected Systems
- D-Link DAP-1620
📦 What is this software?
⚠️ Risk & Real-World Impact
Worst Case
Remote code execution leading to complete device compromise, persistence, lateral movement, and data exfiltration.
Likely Case
Device crash (DoS) or remote code execution allowing attacker to gain control of the device.
If Mitigated
Limited impact if device is isolated behind firewalls with strict network controls.
🎯 Exploit Status
Exploit details have been publicly disclosed. Remote exploitation without authentication is possible.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: N/A
Vendor Advisory: https://www.dlink.com/
Restart Required: No
Instructions:
No official patch available. Device is end-of-life. Consider replacement.
🔧 Temporary Workarounds
Network segmentation
allIsolate DAP-1620 devices in separate VLANs with strict firewall rules
Access control restrictions
allBlock external access to the device's web interface and management ports
🧯 If You Can't Patch
- Immediately remove affected devices from internet-facing positions
- Replace with supported hardware that receives security updates
🔍 How to Verify
Check if Vulnerable:
Check device firmware version via web interface at http://[device-ip]/ or via serial consoleCheck Version:
curl -s http://[device-ip]/ | grep -i firmware || ssh admin@[device-ip] 'show version'Verify Fix Applied:
No fix available to verify. Only mitigation is device replacement.📡 Detection & Monitoring
Log Indicators:
- Multiple failed authentication attempts
- Unusual HTTP requests to /storage endpoint
- Device crash/reboot logs
Network Indicators:
- Unusual traffic patterns to device management interface
- Exploit-specific payloads in HTTP traffic
SIEM Query:
source="dap-1620-logs" AND (uri="/storage" OR message="buffer overflow" OR message="crash")🔗 References
- https://vuldb.com/?ctiid.300622
- https://vuldb.com/?id.300622
- https://vuldb.com/?submit.518969
- https://witty-maiasaura-083.notion.site/D-link-DAP-1620-mod_graph_auth_uri_handler-Vulnerability-1afb2f2a6361809ea7f2dc4df3b85f1f
- https://www.dlink.com/
- https://witty-maiasaura-083.notion.site/D-link-DAP-1620-mod_graph_auth_uri_handler-Vulnerability-1afb2f2a6361809ea7f2dc4df3b85f1f
