CVE-2025-1800: D-Link DAR-7000 Firmware RCE Vulnerability

CVE-2025-1800 Overview

CVE-2025-1800 is a command injection vulnerability in D-Link DAR-7000 firmware version 3.2. The flaw resides in the get_ip_addr_details function within /view/vpn/sxh_vpn/sxh_vpnlic.php, part of the HTTP POST request handler. Attackers can manipulate the ethname argument to inject arbitrary operating system commands. The vulnerability is remotely exploitable and requires low privileges. D-Link has confirmed the affected product line is end-of-life and no longer receives security support. Public exploit details have been disclosed, increasing the exposure risk for organizations still operating this hardware.

Critical Impact
Authenticated remote attackers can execute arbitrary commands on affected D-Link DAR-7000 appliances through the ethname parameter, and no vendor patch will be released because the device is out of support.

Affected Products

D-Link DAR-7000 firmware version 3.2
D-Link DAR-7000 hardware appliance (end-of-life)
All deployments exposing /view/vpn/sxh_vpn/sxh_vpnlic.php to reachable networks

Discovery Timeline

2025-03-01 - CVE-2025-1800 published to the National Vulnerability Database
2026-06-17 - Last updated in NVD database

Technical Details for CVE-2025-1800

Vulnerability Analysis

The vulnerability is a command injection flaw [CWE-77] compounded by improper neutralization of special elements in input [CWE-74]. The get_ip_addr_details function in sxh_vpnlic.php accepts an ethname parameter from an HTTP POST request. The function passes the parameter to a shell context without sanitizing metacharacters. An attacker who can send authenticated POST requests to the web interface can append shell operators to ethname and execute arbitrary commands under the privileges of the web server process. Because DAR-7000 devices operate as VPN and firewall gateways, successful exploitation grants attackers a foothold on a network security boundary. The EPSS score of 5.389% (91st percentile) reflects meaningful real-world exploitation probability relative to the broader CVE population.

Root Cause

The root cause is the direct concatenation of user-controlled input into a shell command within get_ip_addr_details. The affected code path does not validate that ethname matches an expected interface name pattern and does not escape shell metacharacters such as ;, |, &, or backticks before invoking system utilities.

Attack Vector

Exploitation requires network access to the DAR-7000 management interface and a valid low-privileged session. The attacker submits a crafted HTTP POST request to /view/vpn/sxh_vpn/sxh_vpnlic.php with a malicious ethname value. The injected command executes on the appliance operating system. Public disclosure of the technique lowers the barrier to weaponization. Refer to the D-Link Security Announcement SAP10354 and the GitHub CVE Documentation for technical specifics.

Detection Methods for CVE-2025-1800

Indicators of Compromise

HTTP POST requests to /view/vpn/sxh_vpn/sxh_vpnlic.php containing shell metacharacters such as ;, |, &&, or backticks in the ethname parameter
Unexpected child processes spawned by the DAR-7000 web server, particularly sh, bash, wget, curl, or nc
Outbound connections from the appliance to unfamiliar IP addresses or command-and-control infrastructure
Modifications to appliance configuration files or the appearance of new cron jobs and startup scripts

Detection Strategies

Inspect web server and reverse proxy logs for POST requests targeting sxh_vpnlic.php with non-alphanumeric characters in the ethname field
Deploy network intrusion detection signatures that flag command injection patterns against the DAR-7000 management URI
Correlate authentication events with subsequent anomalous outbound traffic from the appliance

Monitoring Recommendations

Forward appliance syslog and web access logs to a centralized SIEM for retention and analysis
Baseline normal administrative traffic to the DAR-7000 and alert on deviations in source IP, user agent, or request timing
Monitor DNS queries originating from the appliance for indicators of tool download or beaconing behavior

How to Mitigate CVE-2025-1800

Immediate Actions Required

Remove the DAR-7000 management interface from any internet-reachable network segment
Restrict access to the web administration console using strict source-IP allowlists on upstream firewalls
Rotate all administrative credentials associated with the appliance and disable unused accounts
Plan migration to a supported VPN gateway platform because no security patch will be issued

Patch Information

No patch is available. D-Link has confirmed via the SAP10354 Security Announcement that the DAR-7000 is beyond its end-of-support lifecycle. The vendor recommends replacing the device with a currently supported product.

Workarounds

Place the DAR-7000 behind a reverse proxy or web application firewall that filters shell metacharacters in POST bodies to sxh_vpnlic.php
Disable the VPN license page or block the /view/vpn/sxh_vpn/ path at the network perimeter if the functionality is not required
Segment the appliance onto an isolated management VLAN accessible only through a jump host with multi-factor authentication
Increase logging verbosity on the appliance and forward events to an external collector for tamper-resistant retention

bash

# Example upstream firewall rule to restrict DAR-7000 management access
# Replace ADMIN_SUBNET with the authorized management CIDR
iptables -A FORWARD -s ADMIN_SUBNET -d DAR7000_IP -p tcp --dport 443 -j ACCEPT
iptables -A FORWARD -d DAR7000_IP -p tcp --dport 443 -j DROP