CVE-2025-10814 Overview
CVE-2025-10814 is a command injection vulnerability affecting D-Link DIR-823X routers running firmware versions 240126, 240802, and 250416. The flaw resides in the /usr/sbin/goahead web server binary, where the port argument is passed to a system shell without proper sanitization. Authenticated remote attackers can manipulate the port parameter to inject operating system commands that execute in the context of the web server process. The vulnerability has been publicly disclosed and assigned [CWE-74] (Improper Neutralization of Special Elements in Output Used by a Downstream Component).
Critical Impact
Remote authenticated attackers can execute arbitrary operating system commands on affected D-Link DIR-823X routers, leading to full device compromise and potential pivoting into the connected network.
Affected Products
- D-Link DIR-823X firmware version 240126
- D-Link DIR-823X firmware version 240802
- D-Link DIR-823X firmware version 250416
Discovery Timeline
- 2025-09-22 - CVE-2025-10814 published to the National Vulnerability Database (NVD)
- 2026-04-29 - Last updated in the NVD database
Technical Details for CVE-2025-10814
Vulnerability Analysis
The vulnerability exists in the goahead embedded web server binary located at /usr/sbin/goahead on the DIR-823X router. The binary handles HTTP requests submitted through the device's web-based administration interface. According to the public disclosure, a handler that processes server settings accepts a port parameter from user-supplied input and forwards it to a downstream command execution routine without adequate input neutralization.
Because the parameter value is concatenated into a shell command string, an attacker can append shell metacharacters such as ;, |, or backticks to escape the intended command context. The injected payload executes with the privileges of the web server process, which on most D-Link consumer routers runs as root. This enables persistent device takeover, configuration tampering, and use of the router as a foothold for lateral movement.
Root Cause
The root cause is the absence of input validation and sanitization on the port argument before it is passed to a system call. The CWE-74 classification reflects improper neutralization of special characters when constructing the downstream shell command. No allow-listing of numeric port values is performed, and no parameterized API replaces the shell invocation.
Attack Vector
The attack vector is network-based. Exploitation requires the attacker to reach the router's administration interface, which is typically exposed on the LAN and, in some deployments, on the WAN. The CVSS 4.0 vector indicates that low-privileged authentication is required, and no user interaction is needed. Public technical details for the vulnerability are available in the GitHub Vulnerability Report and the VulDB entry #325172.
The vulnerability is exploited by submitting a crafted HTTP request to the goahead web server in which the port parameter contains shell metacharacters followed by attacker-controlled commands. Synthetic exploit code is not reproduced here; see the linked advisory for proof-of-concept details.
Detection Methods for CVE-2025-10814
Indicators of Compromise
- Unexpected outbound connections originating from the router's management IP address to unknown hosts.
- Modifications to router configuration files, firewall rules, or DNS settings that were not initiated by an administrator.
- New or unfamiliar processes spawned by the goahead web server in router logs.
- HTTP POST requests to administrative endpoints containing shell metacharacters such as ;, &&, |, or backticks in the port parameter.
Detection Strategies
- Inspect HTTP request logs for the DIR-823X management interface and flag requests where the port field contains non-numeric characters.
- Deploy network intrusion detection signatures that match command injection patterns targeting the goahead server endpoints.
- Correlate router-originated traffic with endpoint telemetry to detect downstream attacker activity following router compromise.
Monitoring Recommendations
- Forward router syslog data to a centralized SIEM or data lake for retention and analytics.
- Establish a baseline of normal management traffic and alert on requests sourced from non-administrative subnets.
- Monitor for unauthorized firmware downgrades or configuration writes on the affected device models.
How to Mitigate CVE-2025-10814
Immediate Actions Required
- Restrict access to the router administration interface to trusted management subnets and disable remote (WAN) administration.
- Rotate administrative credentials for the DIR-823X to reduce the value of any captured low-privilege accounts.
- Audit the device for unauthorized configuration changes, particularly DNS, NTP, and firewall rules.
- Track D-Link's official website for firmware updates addressing CVE-2025-10814.
Patch Information
At the time of publication, no vendor security advisory or patched firmware was referenced in the NVD entry. Administrators should monitor D-Link support channels for an updated build superseding firmware 240126, 240802, and 250416. Until a fix is released, treat affected devices as exposed.
Workarounds
- Place affected routers behind an upstream firewall that blocks untrusted access to the management interface.
- Disable any port-forwarding rule that exposes the router's HTTP(S) administration service to the internet.
- Replace end-of-support hardware with currently maintained models if no firmware fix becomes available.
# Example: block external access to the router management interface from upstream firewall
iptables -A FORWARD -d <router_ip> -p tcp --dport 80 -j DROP
iptables -A FORWARD -d <router_ip> -p tcp --dport 443 -j DROP
Disclaimer: This content was generated using AI. While we strive for accuracy, please verify critical information with official sources.
