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The vulnerability CVE-2025-63932 is an unauthenticated Remote Code Execution flaw in the D-Link DIR-868L A1 router, specifically in firmware version FW106KRb01.bin. The root cause is improper input sanitization within the router’s `cgibin` binary, which provides the HNAP (Home Network Administration Protocol) service. HNAP is a SOAP-based protocol used for device management. The security failure occurs because the service does not filter or validate the content of the HTTP `SOAPAction` header field. An attacker can craft a malicious HTTP request containing shell metacharacters and arbitrary commands within this header. When the vulnerable `cgibin` binary processes the tainted `SOAPAction` value, it passes the unsanitized input directly to a system shell for execution. This flaw is classified as an OS Command Injection vulnerability (CWE-78). Exploitation requires no authentication (PR:N) and no user interaction (UI:N), with a network attack vector (AV:N) and low attack complexity (AC:L). Successful exploitation allows an unauthenticated remote attacker to execute arbitrary shell commands with the privileges of the compromised `cgibin` process, leading to full device compromise.
Platform: D-Link DIR-868L
Version: FW106KRb01.bin
Vulnerability: OS Command Injection
Severity: High
date: 2025-11-19
Prediction: No patch expected
What Undercode Say:
Bash command to check service exposure: `netstat -tlnp | grep :80`
Example malicious curl request structure: `curl -X POST -H “SOAPAction: ;
Pattern for network monitoring (Snort/Suricata): alert tcp any any -> any 80 (msg:"Potential CVE-2025-63932 Exploit"; content:"SOAPAction"; pcre:"/SOAPAction\s:[^\\n][;&|]/”; sid:1000001;)<h2 style="color: blue;">How Exploit:</h2>/bin/telnetd`) via the `SOAPAction` header field without any authentication. The payload is delivered over the network to port 80 or 8080.
Attackers craft an HTTP POST request to the HNAP endpoint on the router's web interface. They inject a shell command (e.g.,
Protection from this CVE
Isolate affected routers.
Disable HNAP service.
Block WAN access.
Use intrusion detection systems.
Replace end-of-life hardware.
Impact:
Full device compromise.
Network traffic interception.
Malware deployment pivot.
Denial of service possible.
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Sources:
Reported By: nvd.nist.gov
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