CVE-2026-2082
📋 TL;DR
This CVE describes an OS command injection vulnerability in D-Link DIR-823X routers. Attackers can remotely execute arbitrary commands by manipulating the 'mac' parameter in the /goform/set_mac_clone endpoint. This affects users of vulnerable D-Link router firmware versions.
💻 Affected Systems
- D-Link DIR-823X
⚠️ Manual Verification Required
This CVE does not have specific version information in our database, so automatic vulnerability detection cannot determine if your system is affected.
Why? The CVE database entry doesn't specify which versions are vulnerable (no version ranges provided by the vendor/NVD).
🔒 Custom verification scripts are available for registered users. Sign up free to download automated test scripts.
- Review the CVE details at NVD
- Check vendor security advisories for your specific version
- Test if the vulnerability is exploitable in your environment
- Consider updating to the latest version as a precaution
⚠️ Risk & Real-World Impact
Worst Case
Full router compromise allowing attacker to intercept traffic, modify configurations, install persistent backdoors, or pivot to internal networks.
Likely Case
Router takeover enabling traffic monitoring, DNS hijacking, credential theft, and denial of service.
If Mitigated
Limited impact if router is behind firewall with restricted WAN access and proper network segmentation.
🎯 Exploit Status
Exploit details are publicly available on GitHub. Attack requires network access to router's web interface.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: Unknown
Vendor Advisory: Not available
Restart Required: Yes
Instructions:
1. Check D-Link support site for firmware updates
2. Download latest firmware for DIR-823X
3. Access router web interface
4. Navigate to firmware update section
5. Upload and apply new firmware
6. Reboot router
🔧 Temporary Workarounds
Disable Remote Management
allPrevent external access to router web interface
Block Web Interface Ports
linuxFirewall rules to restrict access to router management
iptables -A INPUT -p tcp --dport 80 -j DROP
iptables -A INPUT -p tcp --dport 443 -j DROP
🧯 If You Can't Patch
- Isolate router on separate VLAN with strict access controls
- Implement network monitoring for unusual traffic to/from router
🔍 How to Verify
Check if Vulnerable:
Check router firmware version in web interface under System > Firmware. If version is 250416, device is vulnerable.Check Version:
curl -s http://router-ip/goform/getSysInfo | grep firmwareVerify Fix Applied:
Verify firmware version has changed from 250416 to a newer version after update.📡 Detection & Monitoring
Log Indicators:
- Unusual POST requests to /goform/set_mac_clone
- Commands containing shell metacharacters in mac parameter
- Multiple failed login attempts followed by successful access
Network Indicators:
- Unusual outbound connections from router
- Traffic to known malicious IPs from router
- DNS queries to suspicious domains
SIEM Query:
source="router.log" AND (uri="/goform/set_mac_clone" OR (mac="*;*" OR mac="*|*" OR mac="*`*"))