CVE-2026-2055
📋 TL;DR
A vulnerability in D-Link DIR-605L and DIR-619L routers allows remote attackers to disclose sensitive information via the DHCP Client Information Handler component. This affects devices running firmware versions 2.06B01 and 2.13B01. These products are no longer supported by the vendor.
💻 Affected Systems
- D-Link DIR-605L
- D-Link DIR-619L
📦 What is this software?
⚠️ Risk & Real-World Impact
Worst Case
Remote attackers could extract sensitive network configuration information, credentials, or device details that could facilitate further attacks.
Likely Case
Information disclosure revealing network topology, device identifiers, or configuration details that could aid reconnaissance for subsequent attacks.
If Mitigated
Limited impact with proper network segmentation and firewall rules preventing external DHCP traffic to affected devices.
🎯 Exploit Status
Proof-of-concept exploit code is publicly available on GitHub.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: None
Vendor Advisory: None available
Restart Required: No
Instructions:
No official patch available as products are end-of-life. Replace affected hardware with supported models.
🔧 Temporary Workarounds
Network Segmentation
allIsolate affected routers from untrusted networks using VLANs or physical separation.
Firewall Rules
allBlock external DHCP requests to affected devices at network perimeter.
🧯 If You Can't Patch
- Replace affected routers with supported models
- Implement strict network segmentation to isolate vulnerable devices
🔍 How to Verify
Check if Vulnerable:
Check router firmware version via web interface at http://[router-ip]/ or via serial console.Check Version:
Check router web interface or use nmap -sV [router-ip] to identify device model and firmware.Verify Fix Applied:
Verify replacement with supported hardware or successful network segmentation.📡 Detection & Monitoring
Log Indicators:
- Unusual DHCP traffic patterns
- Multiple failed or malformed DHCP requests
Network Indicators:
- Suspicious external DHCP traffic to router IPs
- Unusual information disclosure in DHCP responses
SIEM Query:
source_ip=external AND dest_port=67 AND protocol=udp AND dest_ip=[router-ip]