CVE-2026-2152: D-Link DIR-615 Firmware RCE Vulnerability

CVE-2026-2152 Overview

A critical OS command injection vulnerability has been discovered in the D-Link DIR-615 wireless router firmware version 4.10. This vulnerability exists within the Web Configuration Interface, specifically in the adv_routing.php file. An attacker with administrative privileges can exploit this flaw by manipulating the dest_ip, submask, or gw parameters to inject arbitrary operating system commands. The attack can be initiated remotely over the network, and public exploit information is available.

Critical Impact

Remote attackers with administrative access can execute arbitrary OS commands on affected D-Link DIR-615 routers, potentially leading to complete device compromise, network infiltration, or use of the device in botnet operations. This product has reached end-of-life and is no longer supported by D-Link.

Affected Products

• D-Link DIR-615 Firmware version 4.10
• D-Link DIR-615 Hardware

Discovery Timeline

• 2026-02-08 - CVE-2026-2152 published to NVD
• 2026-02-11 - Last updated in NVD database

Technical Details for CVE-2026-2152

Vulnerability Analysis

This vulnerability is classified as an OS Command Injection (CWE-78) and Command Injection (CWE-77) weakness. The flaw exists in the routing configuration functionality of the D-Link DIR-615 web management interface. When administrators configure static routing through the adv_routing.php page, the application fails to properly sanitize user-supplied input in the routing parameters before passing them to system shell commands.

The vulnerability requires high privileges (administrative access) to exploit but does not require any user interaction beyond the attacker's own actions. Once exploited, an attacker gains the ability to execute arbitrary commands with the privileges of the web server process, typically running as root on embedded Linux systems like those found in consumer routers.

Root Cause

The root cause of this vulnerability is improper input validation and sanitization in the adv_routing.php component. The dest_ip, submask, and gw (gateway) parameters are directly concatenated into shell commands without proper escaping or validation. This allows shell metacharacters and command separators to be injected, enabling arbitrary command execution on the underlying operating system.

Attack Vector

The attack vector is network-based, requiring the attacker to have authenticated administrative access to the router's web configuration interface. The attacker can craft malicious HTTP requests containing OS commands embedded within the routing parameters. These parameters are processed server-side and executed in the context of the router's operating system.

An attacker would typically:

1. Authenticate to the router's administrative interface (using default or compromised credentials)
2. Navigate to or submit a request to the advanced routing configuration page
3. Inject malicious shell commands through the dest_ip, submask, or gw parameters using command separators such as semicolons, pipe characters, or backticks
4. The injected commands execute with the web server's privileges on the router

Detailed technical analysis of this command injection vulnerability is available in the Notion Command Injection Report.

Detection Methods for CVE-2026-2152

Indicators of Compromise

• Unusual outbound network connections from the router to external command and control servers
• Unexpected processes running on the router device (if shell access is available for inspection)
• Modified routing tables or DNS settings that were not configured by administrators
• Authentication logs showing administrative access from unfamiliar IP addresses

Detection Strategies

• Monitor web server logs on network devices for suspicious requests to adv_routing.php containing shell metacharacters (;, |, &, `, $())
• Implement network intrusion detection rules to identify HTTP requests with command injection patterns targeting D-Link devices
• Deploy SentinelOne Singularity™ for network visibility to detect anomalous router behavior and command execution patterns
• Audit administrative access logs for unauthorized or suspicious login attempts to router management interfaces

Monitoring Recommendations

• Enable logging on all D-Link router administrative interfaces and forward logs to a centralized SIEM solution
• Implement network segmentation to isolate management interfaces from general network traffic
• Monitor for firmware modification attempts or configuration changes outside maintenance windows
• Track DNS and routing table changes on network infrastructure devices

How to Mitigate CVE-2026-2152

Immediate Actions Required

• Replace affected D-Link DIR-615 routers with supported devices, as this product has reached end-of-life and will not receive security patches
• Restrict administrative interface access to trusted IP addresses only using firewall rules
• Change default administrative credentials immediately and use strong, unique passwords
• Disable remote management features if they are not strictly required
• Isolate affected routers on a separate network segment with restricted access

Patch Information

No patch is available for this vulnerability. D-Link has discontinued support for the DIR-615 product line. The vendor has confirmed this vulnerability only affects products that are no longer maintained. Organizations should plan to replace affected devices with currently supported alternatives.

For general security information, refer to the D-Link Security Information page. Additional vulnerability details are available at VulDB ID #344854.

Workarounds

• Implement access control lists (ACLs) to restrict management interface access to specific trusted IP addresses
• Place the router behind a firewall that filters malicious input patterns in HTTP requests
• Disable the web management interface entirely and configure the device through serial console if possible
• Consider deploying a network application firewall to inspect and filter requests to vulnerable endpoints
• Monitor and log all access attempts to the router's administrative interface for forensic purposes

# Example: Restrict administrative access via iptables on upstream firewall
# Block external access to router management port
iptables -A FORWARD -d 192.168.0.1 -p tcp --dport 80 -j DROP
iptables -A FORWARD -d 192.168.0.1 -p tcp --dport 443 -j DROP

# Allow management access only from specific admin workstation
iptables -I FORWARD -s 192.168.0.100 -d 192.168.0.1 -p tcp --dport 80 -j ACCEPT