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The vulnerability exists in D-Link DIR-513 router firmware version 1.10. It originates in the login mechanism. When a user submits a POST request to the endpoint `/goform/formLogin` for authentication, the system invokes the subroutine at `/goform/getAuthCode` to handle verification codes. The parameter `FILECODE` is passed to this subroutine. The code fails to perform proper sanitization or filtering on the value supplied within the `FILECODE` parameter. Because there is no validation to block directory traversal sequences like ../, an attacker can manipulate this parameter. By injecting these sequences, they can break out of the intended restricted directory. This allows them to navigate the device’s filesystem arbitrarily. The lack of filtering leads directly to a path traversal condition. Consequently, a remote, unauthenticated attacker can exploit this to read arbitrary files from the device. This could include sensitive configuration files, password hashes, or other system information.
Platform: D-Link DIR-513
Version: 1.10
Vulnerability: Path Traversal
Severity: Critical
date: 05 March 2026
Prediction: 60-90 days
What Undercode Say:
Analytics:
The vulnerability is trivial to exploit and requires no authentication, making it highly accessible to attackers. Given that the DIR-513 is an older model, D-Link may classify it as End-of-Life (EOL) and decline to issue a security patch, leaving users permanently vulnerable. The disclosure date suggests this is a newly discovered flaw in legacy hardware, increasing the risk of mass exploitation by botnets (like Mirai) seeking to expand their ranks. Shodan and FOFA scans would likely reveal thousands of exposed devices globally.
How Exploit:
The exploit is sent as an HTTP POST request to the router. The following curl command demonstrates reading the shadow file:
curl -X POST http://<router_ip>/goform/formLogin \ -d "FILECODE=../../../../etc/shadow"
Protection from this CVE:
As a temporary workaround, users should restrict remote access to the router’s management interface. Disable WAN-side administration if enabled. Implement strict firewall rules to allow access only from trusted internal IP addresses. If the device is confirmed EOL and no patch arrives, the only secure solution is to replace the router with a supported model that receives security updates.
Impact:
Successful exploitation leads to unauthorized read access to the entire filesystem. An attacker can exfiltrate sensitive data such as the device’s configuration, credentials, and network topology information. This information leakage can serve as a stepping stone for further attacks on the internal network.
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Sources:
Reported By: nvd.nist.gov
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D-Link DIR-513, Stack Buffer Overflow, CVE-2025-70220 (Critical)