CVE-2025-6897 Overview
CVE-2025-6897 is an operating system (OS) command injection vulnerability affecting the D-Link DI-7300G+ router running firmware version 19.12.25A1. The flaw resides in the httpd_debug.asp component, where the Time parameter is passed to a system shell without proper sanitization. An adjacent network attacker with low privileges can manipulate the Time argument to execute arbitrary operating system commands on the device. The vulnerability is tracked under [CWE-77] (Command Injection) and [CWE-78] (OS Command Injection). Exploit details have been publicly disclosed, increasing the risk of opportunistic abuse against exposed management interfaces.
Critical Impact
Authenticated adjacent attackers can inject arbitrary OS commands through the Time parameter in httpd_debug.asp, compromising router integrity and availability.
Affected Products
- D-Link DI-7300G+ hardware appliance
- D-Link DI-7300G+ firmware version 19.12.25A1
- Deployments exposing the web management interface (httpd_debug.asp) to adjacent networks
Discovery Timeline
- 2025-06-30 - CVE-2025-6897 published to the National Vulnerability Database (NVD)
- 2026-04-29 - Last updated in the NVD database
Technical Details for CVE-2025-6897
Vulnerability Analysis
The vulnerability exists in the debug functionality exposed through httpd_debug.asp on the D-Link DI-7300G+ router. The handler accepts a Time parameter and incorporates its value into a shell command without input validation or sanitization. Because the value is concatenated directly into a system call, shell metacharacters such as ;, |, &, and backticks alter the intended command flow and execute attacker-supplied operating system commands.
Exploitation requires adjacent network access and low privileges on the router's web interface. Successful exploitation grants command execution in the context of the embedded web server process, typically running with elevated rights on consumer and small business routers. The combination of CWE-77 and CWE-78 reflects both generic command injection and OS-specific command execution semantics.
With an EPSS probability of 0.818% (74th percentile), this issue is more likely to be exploited than the average disclosed CVE. Public disclosure of the exploit technique further reduces the barrier for opportunistic attackers scanning for vulnerable D-Link devices.
Root Cause
The root cause is missing input validation on the Time parameter inside httpd_debug.asp. User-controlled HTTP input is passed directly into a shell execution function without escaping shell metacharacters or constraining values to expected formats such as numeric timestamps.
Attack Vector
An attacker on an adjacent network sends a crafted HTTP request to httpd_debug.asp with shell metacharacters appended to the Time parameter. The web server invokes a system shell, which parses the metacharacters and executes the injected commands. Refer to the published GitHub CVE Document and VulDB Reference #314389 for technical details.
Detection Methods for CVE-2025-6897
Indicators of Compromise
- HTTP requests to httpd_debug.asp containing shell metacharacters (;, |, &, `, $()) in the Time parameter
- Unexpected outbound connections originating from the router management plane to attacker-controlled hosts
- New or unknown processes spawned by the embedded httpd service on the device
- Configuration changes, DNS modifications, or firmware persistence artifacts on the DI-7300G+
Detection Strategies
- Inspect HTTP traffic destined for the router management interface for requests targeting httpd_debug.asp with non-numeric values in the Time parameter.
- Deploy network IDS signatures that flag command injection patterns against D-Link administrative endpoints.
- Correlate router syslog events with internal network telemetry to identify anomalous outbound traffic from management VLANs.
Monitoring Recommendations
- Forward router and firewall logs to a centralized analytics platform for query and alerting on management-plane anomalies.
- Alert on any HTTP POST or GET requests reaching httpd_debug.asp from non-administrative sources.
- Monitor for new SSH, Telnet, or reverse shell connections originating from network infrastructure devices.
How to Mitigate CVE-2025-6897
Immediate Actions Required
- Restrict access to the DI-7300G+ web management interface to dedicated administrative networks only.
- Disable remote administration features and block external access to httpd_debug.asp at the perimeter firewall.
- Rotate all administrative credentials on affected devices and audit existing low-privilege accounts.
- Review router logs and configuration for signs of unauthorized changes consistent with command execution.
Patch Information
No vendor advisory or firmware update addressing CVE-2025-6897 is referenced in the available data. Monitor the D-Link Official Website for security bulletins related to the DI-7300G+ and firmware version 19.12.25A1. Until a fixed firmware release is available, treat the device as vulnerable and apply compensating controls.
Workarounds
- Place the router management interface behind a VPN or jump host and deny direct LAN or WAN access.
- Apply access control lists (ACLs) that limit HTTP and HTTPS access to httpd_debug.asp to a small set of trusted administrative IPs.
- Segment the router's management VLAN away from user, guest, and IoT networks to reduce adjacent network exposure.
- Replace end-of-support or unpatched units with currently supported hardware if no vendor fix is forthcoming.
# Example perimeter ACL restricting access to the router management interface
# Permit only the administrative subnet to reach the router web UI
access-list 110 permit tcp 10.10.20.0 0.0.0.255 host 10.0.0.1 eq 80
access-list 110 permit tcp 10.10.20.0 0.0.0.255 host 10.0.0.1 eq 443
access-list 110 deny tcp any host 10.0.0.1 eq 80
access-list 110 deny tcp any host 10.0.0.1 eq 443
access-list 110 permit ip any any
Disclaimer: This content was generated using AI. While we strive for accuracy, please verify critical information with official sources.
