CVE-2025-1539
📋 TL;DR
A critical stack-based buffer overflow vulnerability exists in D-Link DAP-1320 firmware version 1.00, specifically in the replace_special_char function. This allows remote attackers to execute arbitrary code on affected devices, potentially taking full control. Only products no longer supported by the vendor are affected.
💻 Affected Systems
- D-Link DAP-1320
📦 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 takeover for botnet enrollment, credential theft, or network reconnaissance
If Mitigated
Denial of service or limited information disclosure if exploit fails
🎯 Exploit Status
Exploit details have been publicly disclosed and may be used in attacks
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: N/A
Vendor Advisory: https://legacy.us.dlink.com/pages/product.aspx?id=4b2bbe2e3f1d440ea65bc56c7e3dcc5c
Restart Required: No
Instructions:
No official patch available as product is end-of-life. Replace with supported hardware.
🔧 Temporary Workarounds
Network Segmentation
allIsolate DAP-1320 devices in separate VLAN with strict firewall rules
Access Control
allBlock all inbound traffic to DAP-1320 management interfaces from untrusted networks
🧯 If You Can't Patch
- Immediately replace affected devices with supported hardware
- Implement strict network segmentation and firewall rules to limit attack surface
🔍 How to Verify
Check if Vulnerable:
Check device firmware version via web interface or SSH: System Information should show version 1.00Check Version:
Check web interface at http://[device-ip]/ or use telnet/SSH if enabledVerify Fix Applied:
Verify device has been replaced with supported hardware or removed from network📡 Detection & Monitoring
Log Indicators:
- Unusual memory access patterns
- Multiple failed buffer overflow attempts
- Unexpected process crashes
Network Indicators:
- Unusual traffic to /storagein.pd-XXXXXX endpoint
- Suspicious payloads containing special character manipulation
SIEM Query:
source_ip=* AND (uri_path="/storagein.pd-*" OR payload_contains="replace_special_char")🔗 References
- https://legacy.us.dlink.com/pages/product.aspx?id=4b2bbe2e3f1d440ea65bc56c7e3dcc5c
- https://tasty-foxtrot-3a8.notion.site/D-link-DAP-1320-replace_special_char-Vulnerability-1960448e6195809c94f9fd2ff1f59bcf?pvs=4
- https://vuldb.com/?ctiid.296480
- https://vuldb.com/?id.296480
- https://vuldb.com/?submit.497496
- https://www.dlink.com/
