CVE-2026-2055 Overview
A vulnerability has been identified in D-Link DIR-605L and DIR-619L wireless routers affecting firmware versions 2.06B01 and 2.13B01. The vulnerability exists within the DHCP Client Information Handler component, where improper handling of data can lead to information disclosure. This weakness allows remote attackers to extract sensitive information from the affected devices without requiring authentication.
Critical Impact
This vulnerability affects end-of-life products that no longer receive security updates from D-Link, leaving organizations with these devices permanently exposed to information disclosure attacks that can be launched remotely over the network.
Affected Products
- D-Link DIR-605L firmware version 2.06B01
- D-Link DIR-619L firmware version 2.06B01
- D-Link DIR-619L firmware version 2.13B01
Discovery Timeline
- February 6, 2026 - CVE-2026-2055 published to NVD
- February 6, 2026 - Last updated in NVD database
Technical Details for CVE-2026-2055
Vulnerability Analysis
This information disclosure vulnerability (CWE-200: Exposure of Sensitive Information to an Unauthorized Actor) resides in the DHCP Client Information Handler component of affected D-Link routers. The vulnerability allows unauthorized parties to remotely access sensitive information that should be restricted. The flaw can be exploited over the network without requiring user interaction or authentication credentials, making it accessible to attackers who can reach the device's network interface.
The affected products have reached end-of-life status, meaning D-Link no longer provides security patches or support for these devices. This significantly increases the risk for organizations still using these routers in production environments.
Root Cause
The root cause stems from improper information handling within the DHCP Client Information Handler component. The vulnerable function fails to adequately restrict access to sensitive data, allowing remote attackers to extract information that should not be accessible to unauthorized users. This represents a classic information exposure weakness where the system does not properly enforce access controls on sensitive data.
Attack Vector
The attack can be launched remotely over the network. An attacker with network access to the vulnerable device can exploit the DHCP Client Information Handler to extract sensitive information. The attack requires no authentication and no user interaction, making it straightforward to execute. A proof-of-concept exploit has been made publicly available, increasing the likelihood of exploitation in the wild.
The vulnerability is documented in the GitHub Vulnerability Report, which includes details on the exploitation mechanism. Additional technical analysis is available through the VulDB entry #344615.
Detection Methods for CVE-2026-2055
Indicators of Compromise
- Unusual network traffic patterns targeting the DHCP service on affected D-Link routers
- Unexpected queries to the DHCP Client Information Handler from external or unauthorized IP addresses
- Log entries indicating access attempts to DHCP-related management functions
Detection Strategies
- Monitor network traffic for reconnaissance activities targeting D-Link router management interfaces
- Implement network intrusion detection rules to identify exploitation attempts against DHCP components
- Review access logs for suspicious queries to the DHCP Client Information Handler functionality
Monitoring Recommendations
- Deploy network monitoring on segments containing affected D-Link devices
- Configure alerts for any external access attempts to router management interfaces
- Establish baseline network behavior to identify anomalous traffic patterns targeting DHCP services
How to Mitigate CVE-2026-2055
Immediate Actions Required
- Isolate affected D-Link DIR-605L and DIR-619L routers from untrusted networks immediately
- Replace end-of-life devices with currently supported router models that receive security updates
- Implement network segmentation to limit exposure of vulnerable devices
- Restrict management interface access to trusted IP addresses only
Patch Information
No security patch is available for this vulnerability. D-Link has confirmed that the DIR-605L and DIR-619L routers have reached end-of-life status and are no longer supported. The vendor does not provide security updates for discontinued products. Organizations using these devices should plan for immediate replacement with supported alternatives. For more information, visit the D-Link Official Site.
Workarounds
- Place affected routers behind a firewall that restricts external access to management interfaces
- Disable remote management features if not required for operations
- Implement network access controls to limit which hosts can communicate with the vulnerable devices
- Consider deploying a VPN to provide an additional layer of protection for network management traffic
# Example: Firewall rules to restrict access to D-Link router (iptables)
# Replace 192.168.1.1 with router IP and 192.168.1.100 with trusted admin IP
# Block external access to router management ports
iptables -A INPUT -d 192.168.1.1 -p tcp --dport 80 -j DROP
iptables -A INPUT -d 192.168.1.1 -p tcp --dport 443 -j DROP
# Allow management only from trusted internal host
iptables -I INPUT -s 192.168.1.100 -d 192.168.1.1 -p tcp --dport 80 -j ACCEPT
Disclaimer: This content was generated using AI. While we strive for accuracy, please verify critical information with official sources.
