CVE-2026-2061
📋 TL;DR
This CVE describes an OS command injection vulnerability in D-Link DIR-823X routers. Attackers can remotely execute arbitrary commands on affected devices by manipulating the set_ipv6 function. This affects users of vulnerable D-Link router firmware versions.
💻 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, or use device in botnets.
Likely Case
Router configuration manipulation, network traffic interception, or denial of service attacks.
If Mitigated
Limited impact if device is behind firewalls with strict inbound rules and command execution is sandboxed.
🎯 Exploit Status
Public disclosure available via GitHub repository, making exploitation straightforward 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. 3. Upload via web interface. 4. Reboot router.
🔧 Temporary Workarounds
Disable IPv6 Configuration
allPrevent exploitation by disabling IPv6 configuration via web interface
Restrict Web Interface Access
allLimit web management interface to trusted internal IPs only
🧯 If You Can't Patch
- Isolate router on separate VLAN with strict firewall rules
- Disable remote administration and WAN-side web interface access
🔍 How to Verify
Check if Vulnerable:
Check firmware version in router web interface under System > FirmwareCheck Version:
Check via web interface or SSH if enabled: cat /etc/versionVerify Fix Applied:
Verify firmware version is newer than 250416📡 Detection & Monitoring
Log Indicators:
- Unusual POST requests to /goform/set_ipv6
- Suspicious command execution in system logs
Network Indicators:
- Unexpected outbound connections from router
- Traffic patterns suggesting compromised device
SIEM Query:
source="router_logs" AND uri="/goform/set_ipv6" AND (method="POST" OR contains(command, ";"))