CVE-2026-1505: D-Link DIR-615 RCE Vulnerability

CVE-2026-1505 Overview

A critical OS command injection vulnerability has been identified in D-Link DIR-615 firmware version 4.10. This security flaw affects the URL Filter component, specifically within the /set_temp_nodes.php file processing. The vulnerability allows remote attackers with administrative privileges to execute arbitrary operating system commands on the affected device.

Critical Impact

Remote attackers can leverage this command injection flaw to execute arbitrary OS commands on the D-Link DIR-615 router, potentially leading to complete device compromise, network infiltration, or use of the device in botnet attacks. This vulnerability affects end-of-life products that no longer receive security updates from D-Link.

Affected Products

• D-Link DIR-615 firmware version 4.10
• D-Link DIR-615 (end-of-life products no longer supported by vendor)

Discovery Timeline

• 2026-01-28 - CVE-2026-1505 published to NVD
• 2026-01-29 - Last updated in NVD database

Technical Details for CVE-2026-1505

Vulnerability Analysis

This vulnerability is classified as OS Command Injection (CWE-77), which occurs when an application constructs system commands using user-supplied input without proper sanitization. In the case of the D-Link DIR-615, the /set_temp_nodes.php endpoint within the URL Filter component fails to adequately validate or sanitize input parameters before incorporating them into operating system commands.

The attack can be executed remotely over the network, though it requires high-level (administrative) privileges to exploit. Once exploited, an attacker can achieve complete compromise of the confidentiality, integrity, and availability of the affected router. The exploit has been publicly disclosed, increasing the risk of widespread exploitation attempts against vulnerable devices.

Of particular concern is that this vulnerability affects products that have reached end-of-life status and are no longer supported by D-Link, meaning no official patches will be released to address this security flaw.

Root Cause

The root cause of this vulnerability lies in improper input validation within the URL Filter component's /set_temp_nodes.php file. The application fails to properly sanitize user-controlled input before passing it to system command execution functions. This allows specially crafted input containing shell metacharacters or command separators to break out of the intended command context and execute arbitrary commands on the underlying operating system.

Attack Vector

The attack vector for CVE-2026-1505 is network-based, allowing remote exploitation. An attacker with administrative credentials to the router's web interface can manipulate parameters sent to the /set_temp_nodes.php endpoint. By injecting shell metacharacters (such as ;, |, &&, or backticks) along with malicious commands into vulnerable parameters, the attacker can execute arbitrary system commands with the privileges of the web server process running on the router.

The vulnerability mechanism involves insufficient input filtering in the URL Filter component. When processing requests to /set_temp_nodes.php, user-supplied data is incorporated into system commands without proper escaping or validation. For detailed technical information about the exploitation technique, refer to the Notion Documentation on D-Link DIR-615 and the VulDB entry #343117.

Detection Methods for CVE-2026-1505

Indicators of Compromise

• Unexpected outbound network connections from the router to unknown IP addresses
• Unusual processes running on the device or abnormal CPU/memory utilization
• Modified configuration files or unexpected changes to router settings
• HTTP requests to /set_temp_nodes.php containing shell metacharacters (;, |, &&, `, $())

Detection Strategies

• Monitor web server logs on D-Link DIR-615 devices for suspicious requests to /set_temp_nodes.php containing potential command injection payloads
• Implement network-based intrusion detection rules to identify HTTP traffic patterns consistent with command injection attempts against the URL Filter component
• Deploy SentinelOne Singularity for IoT to detect anomalous behavior patterns on network devices

Monitoring Recommendations

• Enable logging on the router's web management interface and forward logs to a central SIEM for analysis
• Monitor for unusual DNS queries or network traffic originating from the router
• Implement network segmentation to isolate vulnerable devices and monitor traffic crossing segment boundaries

How to Mitigate CVE-2026-1505

Immediate Actions Required

• Replace affected D-Link DIR-615 devices with actively supported router models, as no patches are available for this end-of-life product
• Disable remote management access to the router's web interface from untrusted networks
• Restrict administrative access to the router to trusted IP addresses only
• Implement strong, unique administrative credentials for the device

Patch Information

No patch is available for this vulnerability. The D-Link DIR-615 has reached end-of-life status and is no longer supported by the vendor. D-Link will not release security updates for this product. The only effective remediation is to replace the affected device with a currently supported router model.

For more information, visit the D-Link Official Website to identify supported replacement devices. Additional vulnerability details are available through VulDB #343117.

Workarounds

• Disable the URL Filter feature if it is not required for network operations
• Implement access control lists (ACLs) to restrict which IP addresses can access the router's management interface
• Place the router behind a firewall that can filter malicious requests to the vulnerable endpoint
• Consider deploying a web application firewall (WAF) to filter command injection attempts before they reach the device

# Example: Restrict management interface access (if supported by firmware)
# Access router CLI and configure IP-based access restrictions
# Note: Replace with your trusted management IP range

# Disable remote management from WAN interface
# Access: Management > Remote Management > Disable

# Restrict LAN management access to specific IPs
# This may require replacement device with advanced ACL support