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

CVE-2026-1505 Overview

CVE-2026-1505 is an operating system command injection vulnerability affecting D-Link DIR-615 firmware version 4.10. The flaw resides in the /set_temp_nodes.php script within the URL Filter component. Attackers can manipulate input to inject arbitrary operating system commands that execute on the router. The vulnerability is remotely exploitable over the network, although it requires high privileges to reach the affected endpoint. The exploit has been disclosed publicly, increasing the likelihood of opportunistic attacks. This vulnerability affects products that are no longer supported by D-Link, meaning no official patch will be released. The weakness is categorized under [CWE-77] (Improper Neutralization of Special Elements used in a Command).

Critical Impact
Authenticated attackers can execute arbitrary operating system commands on affected D-Link DIR-615 routers, leading to full device compromise on an end-of-life product that will not receive a vendor fix.

Affected Products

D-Link DIR-615 hardware revision D
D-Link DIR-615 firmware version 4.10
All deployments of DIR-615 4.10 (end-of-life, unsupported)

Discovery Timeline

2026-01-28 - CVE-2026-1505 published to NVD
2026-01-30 - Last updated in NVD database

Technical Details for CVE-2026-1505

Vulnerability Analysis

The vulnerability exists in the URL Filter functionality of the DIR-615 web management interface. Specifically, the /set_temp_nodes.php handler processes user-supplied parameters without proper neutralization of shell metacharacters. Attackers can append shell operators such as ;, |, or backticks to inject commands that execute in the context of the web server process, which typically runs with elevated privileges on consumer routers. Successful exploitation results in full control over the router operating system. Because the DIR-615 4.10 product line is end-of-life, no security update will be issued by D-Link.

Root Cause

The root cause is improper neutralization of special elements passed to an OS command. The /set_temp_nodes.php script forwards parameter values to a system shell call without sanitization or argument escaping. This pattern matches [CWE-77] and is common in older small office and home office (SOHO) router firmware that builds shell strings via system()-style functions.

Attack Vector

The attack vector is network-based. An attacker with valid administrative credentials, or who has bypassed authentication through another flaw, sends a crafted HTTP request to /set_temp_nodes.php. The injected payload is concatenated into a shell command and executed by the router. The vulnerability does not require user interaction. Public disclosure of the exploit details on VulDB and external research notes increases the practical risk of exploitation against exposed devices.

No verified proof-of-concept code is available from authoritative sources. Refer to the VulDB entry #343117 and the D-Link DIR-615 research notes for technical details.

Detection Methods for CVE-2026-1505

Indicators of Compromise

HTTP POST or GET requests to /set_temp_nodes.php containing shell metacharacters such as ;, &&, |, or backticks
Unexpected outbound connections originating from the router management interface to attacker-controlled infrastructure
New or unknown processes spawned by the router web service following URL Filter configuration changes
DNS configuration changes, firmware modifications, or new firewall rules applied without administrative action

Detection Strategies

Inspect web server and reverse proxy logs in front of the router for suspicious parameter values targeting /set_temp_nodes.php
Monitor network traffic for HTTP requests to DIR-615 management interfaces from non-administrative subnets
Apply intrusion detection signatures that flag shell metacharacters in HTTP request bodies destined for D-Link administrative endpoints

Monitoring Recommendations

Aggregate router syslog output into a central logging platform and alert on configuration changes outside maintenance windows
Track east-west and north-south traffic from router management IP addresses to identify command-and-control activity
Conduct periodic network scans to inventory end-of-life D-Link devices still in production

How to Mitigate CVE-2026-1505

Immediate Actions Required

Replace the DIR-615 4.10 router with a currently supported model, since D-Link will not issue a patch for this end-of-life device
Restrict access to the router web management interface to a dedicated management VLAN or trusted host
Disable remote (WAN-side) administration on all DIR-615 devices until decommissioning is complete
Rotate administrative credentials and audit existing accounts for unauthorized additions

Patch Information

No patch is available. D-Link has confirmed that the DIR-615 4.10 product is no longer supported by the maintainer. Affected organizations should plan hardware replacement. Reference the D-Link official website for current supported product lines.

Workarounds

Place affected routers behind a separate firewall that filters all inbound HTTP and HTTPS traffic to the management interface
Disable the URL Filter feature where operationally feasible to reduce exposure of the vulnerable handler
Segment the affected router off production networks and treat it as untrusted until replacement

bash

# Example: restrict access to router management interface using iptables on an upstream gateway
iptables -A FORWARD -p tcp -d <router_ip> --dport 80 -s <mgmt_subnet> -j ACCEPT
iptables -A FORWARD -p tcp -d <router_ip> --dport 80 -j DROP
iptables -A FORWARD -p tcp -d <router_ip> --dport 443 -s <mgmt_subnet> -j ACCEPT
iptables -A FORWARD -p tcp -d <router_ip> --dport 443 -j DROP