CVE-2025-10401
📋 TL;DR
This vulnerability allows remote attackers to execute arbitrary commands on D-Link DIR-823x routers by injecting malicious input into the target_addr parameter of the /goform/diag_ping endpoint. Attackers can potentially take full control of affected devices. All users of D-Link DIR-823x routers with firmware up to version 250416 are affected.
💻 Affected Systems
- D-Link DIR-823x AX3000
📦 What is this software?
⚠️ Risk & Real-World Impact
Worst Case
Complete device compromise allowing attackers to install persistent malware, pivot to internal networks, intercept traffic, or use the device as part of a botnet.
Likely Case
Attackers gain shell access to execute commands, potentially stealing credentials, modifying device settings, or launching attacks against other systems.
If Mitigated
If properly segmented and monitored, impact is limited to the router itself with no lateral movement to other systems.
🎯 Exploit Status
Public exploit details are available on GitHub, making this easily exploitable by attackers with basic skills.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: Firmware version after 250416
Vendor Advisory: https://www.dlink.com/
Restart Required: Yes
Instructions:
1. Visit D-Link support website. 2. Download latest firmware for DIR-823x. 3. Log into router admin interface. 4. Navigate to System Tools > Firmware Upgrade. 5. Upload and install the new firmware. 6. Reboot the router.
🔧 Temporary Workarounds
Disable WAN access to web interface
allPrevent external access to the vulnerable endpoint by disabling remote management
Log into router admin > Advanced > Remote Management > Disable
Block access to vulnerable endpoint
linuxUse firewall rules to block access to /goform/diag_ping
iptables -A INPUT -p tcp --dport 80 -m string --string "/goform/diag_ping" --algo bm -j DROP
🧯 If You Can't Patch
- Segment the router on an isolated network segment with strict firewall rules
- Implement network monitoring for suspicious traffic to/from the router
🔍 How to Verify
Check if Vulnerable:
Check current firmware version in router admin interface under Status > Device InfoCheck Version:
curl -s http://router-ip/ | grep -i firmwareVerify Fix Applied:
Verify firmware version is greater than 250416 and test that command injection is no longer possible📡 Detection & Monitoring
Log Indicators:
- Unusual POST requests to /goform/diag_ping with shell metacharacters
- Multiple failed login attempts followed by diag_ping access
Network Indicators:
- HTTP requests containing shell commands in target_addr parameter
- Outbound connections from router to suspicious IPs
SIEM Query:
source="router.log" AND (uri="/goform/diag_ping" AND (target_addr="*;*" OR target_addr="*|*" OR target_addr="*`*"))