Overview
In the cybersecurity landscape, vulnerabilities are regularly discovered in both current and legacy systems. One such recent discovery is CVE-2025-7909, a critical vulnerability found in the D-Link DIR-513 1.0 router. This vulnerability has been rated as critical due to its potential to compromise systems and lead to significant data leakage. It specifically impacts the Boa Webserver component of these routers, which are no longer supported by D-Link. This lack of support increases the risk, as users cannot rely on vendor patches or updates for mitigation.
Vulnerability Summary
CVE ID: CVE-2025-7909
Severity: Critical (CVSS Score: 8.8)
Attack Vector: Network
Privileges Required: None
User Interaction: None
Impact: Potential system compromise and data leakage
Affected Products
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Product | Affected Versions
D-Link DIR-513 | 1.0
How the Exploit Works
The vulnerability resides in the sprintf function of the file /goform/formLanSetupRouterSettings of the Boa Webserver component. The issue is triggered by improper handling of the argument ‘curTime’. An attacker can manipulate the ‘curTime’ argument, leading to a stack-based buffer overflow. This overflow can allow unauthorized remote execution of arbitrary code. This vulnerability is particularly dangerous because it can be exploited remotely, and the exploit has been publicly disclosed.
Conceptual Example Code
Here is a conceptual example of how the vulnerability might be exploited. It entails issuing a HTTP request with a manipulated ‘curTime’ argument in the payload:
POST /goform/formLanSetupRouterSettings HTTP/1.1
Host: target_router_ip
Content-Type: application/x-www-form-urlencoded
curTime=AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA...In this example, ‘A’s represent an excessively long string which would cause a buffer overflow in the target router’s memory stack.
Mitigation Guidance
In the absence of an official patch from the vendor, users can mitigate the risk by employing a Web Application Firewall (WAF) or Intrusion Detection System (IDS) to detect and block attempts to exploit the vulnerability. It is also advisable to replace unsupported devices like the D-Link DIR-513 1.0 with newer, supported models to ensure ongoing security updates and protection.