CVE-2025-10666
📋 TL;DR
A buffer overflow vulnerability in D-Link DIR-825 routers allows remote attackers to execute arbitrary code by manipulating the countdown_time parameter in apply.cgi. This affects all DIR-825 routers up to firmware version 2.10. The vulnerability is particularly dangerous because these devices are no longer supported by the manufacturer.
💻 Affected Systems
- D-Link DIR-825
📦 What is this software?
⚠️ Risk & Real-World Impact
Worst Case
Remote code execution leading to complete device compromise, network infiltration, and persistent backdoor installation.
Likely Case
Remote code execution allowing attackers to reconfigure the router, intercept traffic, or launch attacks against internal networks.
If Mitigated
Limited impact if device is behind firewall with restricted WAN access, though internal threats remain possible.
🎯 Exploit Status
Public proof-of-concept exploit exists on GitHub. The vulnerability requires no authentication and has straightforward exploitation.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: None available
Vendor Advisory: None available - product is end-of-life
Restart Required: No
Instructions:
No official patch exists. D-Link has discontinued support for DIR-825 routers. Immediate replacement with supported hardware is recommended.
🔧 Temporary Workarounds
Disable remote management
allPrevent external access to the router's web interface
Access router admin panel → Advanced → Remote Management → Disable
Network segmentation
allIsolate DIR-825 devices from critical network segments
🧯 If You Can't Patch
- Immediately replace DIR-825 routers with supported hardware
- Implement strict firewall rules blocking all external access to port 80/443 on affected devices
🔍 How to Verify
Check if Vulnerable:
Check firmware version in router admin interface (Status → Device Info). If version is 2.10 or lower, device is vulnerable.Check Version:
curl -s http://router-ip/status.cgi | grep -i firmwareVerify Fix Applied:
No fix available to verify. Only verification is hardware replacement.📡 Detection & Monitoring
Log Indicators:
- Unusual HTTP POST requests to apply.cgi with long countdown_time parameters
- Multiple failed exploit attempts
Network Indicators:
- Unusual outbound connections from router IP
- Traffic patterns suggesting router compromise
SIEM Query:
source="router-logs" AND (uri="/apply.cgi" OR uri="*countdown_time*")🔗 References
- https://github.com/panda666-888/vuls/blob/main/d-link/dir-825/apply.cgi.md
- https://github.com/panda666-888/vuls/blob/main/d-link/dir-825/apply.cgi.md#poc
- https://vuldb.com/?ctiid.324787
- https://vuldb.com/?id.324787
- https://vuldb.com/?submit.652047
- https://www.dlink.com/
- https://www.exploit-db.com/exploits/52469
- https://github.com/panda666-888/vuls/blob/main/d-link/dir-825/apply.cgi.md
- https://github.com/panda666-888/vuls/blob/main/d-link/dir-825/apply.cgi.md#poc
