CVE-2026-2157
📋 TL;DR
This CVE describes a remote command injection vulnerability in D-Link DIR-823X routers. Attackers can execute arbitrary operating system commands by manipulating parameters in the static route configuration function. All users of affected D-Link router models are vulnerable to remote compromise.
💻 Affected Systems
- D-Link DIR-823X
📦 What is this software?
⚠️ Risk & Real-World Impact
Worst Case
Full device compromise allowing attackers to install persistent backdoors, intercept network traffic, pivot to internal networks, or join botnets.
Likely Case
Remote code execution leading to device takeover, credential theft, and network surveillance.
If Mitigated
Limited impact if device is behind firewall with restricted WAN access and proper network segmentation.
🎯 Exploit Status
Public exploit code exists in GitHub repository, making exploitation trivial for attackers.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: Unknown
Vendor Advisory: https://www.dlink.com/
Restart Required: Yes
Instructions:
1. Check D-Link website for firmware updates
2. Download latest firmware for DIR-823X
3. Access router admin interface
4. Navigate to firmware update section
5. Upload and apply new firmware
6. Reboot router after update
🔧 Temporary Workarounds
Disable WAN Management
allPrevent remote access to router administration interface
Network Segmentation
allPlace router in isolated network segment to limit lateral movement
🧯 If You Can't Patch
- Replace vulnerable hardware with supported, patched alternative
- Implement strict firewall rules blocking all WAN access to router management interface
🔍 How to Verify
Check if Vulnerable:
Check router firmware version in admin interface under System > FirmwareCheck Version:
curl -s http://router-ip/goform/getSysInfo | grep firmwareVerify Fix Applied:
Verify firmware version is newer than 250416 and test static route functionality📡 Detection & Monitoring
Log Indicators:
- Unusual POST requests to /goform/set_static_route_table with shell metacharacters
- Unexpected process execution from web service
Network Indicators:
- Suspicious outbound connections from router to unknown IPs
- Unusual traffic patterns from router management interface
SIEM Query:
source="router.log" AND uri="/goform/set_static_route_table" AND (payload="|" OR payload=";" OR payload="`" OR payload="$")