CVE-2025-11096
📋 TL;DR
This CVE describes a command injection vulnerability in D-Link DIR-823X routers that allows remote attackers to execute arbitrary commands on affected devices. The vulnerability exists in the /goform/diag_traceroute endpoint where the target_addr parameter is not properly sanitized. All users of affected D-Link DIR-823X routers with vulnerable firmware are at risk.
💻 Affected Systems
- D-Link DIR-823X
📦 What is this software?
⚠️ Risk & Real-World Impact
Worst Case
Complete device compromise allowing attacker to install persistent backdoors, pivot to internal networks, steal credentials, or use the device as part of a botnet.
Likely Case
Device takeover leading to network disruption, credential theft, and potential lateral movement within the network.
If Mitigated
Limited impact if device is behind firewall with restricted access to management interface and proper network segmentation.
🎯 Exploit Status
Exploit code is publicly available on GitHub, making this easily weaponizable by attackers with minimal technical skill.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: Check D-Link website for latest firmware
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 web interface. 4. Navigate to System Tools > Firmware Upgrade. 5. Upload and install new firmware. 6. Reboot router after installation.
🔧 Temporary Workarounds
Disable Remote Management
allPrevent external access to the vulnerable web interface
Log into router > Advanced > Remote Management > Disable
Block Access to Vulnerable Endpoint
linuxUse firewall rules to block access to /goform/diag_traceroute
iptables -A INPUT -p tcp --dport 80 -m string --string "/goform/diag_traceroute" --algo bm -j DROP
🧯 If You Can't Patch
- Isolate affected routers in separate VLAN with strict firewall rules
- Implement network monitoring for suspicious traffic to/from router management interface
🔍 How to Verify
Check if Vulnerable:
Check firmware version in router web interface under System Tools > Firmware VersionCheck Version:
curl -s http://router-ip/ | grep -i firmwareVerify Fix Applied:
Verify firmware version is newer than 250416 and test if /goform/diag_traceroute endpoint still accepts malicious input📡 Detection & Monitoring
Log Indicators:
- Unusual POST requests to /goform/diag_traceroute
- Commands with shell metacharacters in target_addr parameter
- Multiple failed traceroute attempts
Network Indicators:
- Outbound connections from router to unexpected destinations
- Unusual traffic patterns from router management interface
SIEM Query:
source="router-logs" AND (uri="/goform/diag_traceroute" AND (target_addr CONTAINS "|" OR target_addr CONTAINS ";" OR target_addr CONTAINS "`"))