Overview
Recently, a critical vulnerability was discovered in D-Link DIR-825 2.03, a widely used version of the D-Link router. This vulnerability has been classified as a stack-based buffer overflow, which can lead to severe consequences including potential system compromise or data leakage. Given that the affected products are no longer supported by the manufacturer, it’s urgent for end-users, administrators, and organizations reliant on these products to take immediate action to mitigate the risks associated with this vulnerability.
Vulnerability Summary
CVE ID: CVE-2025-6292
Severity: Critical (CVSS: 8.8)
Attack Vector: Remote
Privileges Required: None
User Interaction: None
Impact: Potential system compromise or data leakage
Affected Products
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Product | Affected Versions
D-Link | DIR-825 2.03
How the Exploit Works
The vulnerability exists within the function sub_4091AC of the component HTTP POST Request Handler. An attacker can exploit this vulnerability by sending a specially crafted HTTP POST request that includes an oversized payload. The server’s buffer, unable to handle the excessive data, overflows, potentially allowing an attacker to execute arbitrary code or cause a denial of service.
Conceptual Example Code
Here is a conceptual example of how an attacker could potentially exploit this vulnerability. This code is presented for illustrative purposes only:
POST /vulnerable/endpoint HTTP/1.1
Host: target.example.com
Content-Type: application/json
{ "oversized_payload": "A"*10000 }In this example, ‘A’*10000 represents an oversized payload that exceeds the buffer’s capacity, leading to buffer overflow.
Recommended Mitigation
Given that this vulnerability affects products no longer supported by the vendor, applying a vendor patch is not possible. In such circumstances, it is recommended to use a Web Application Firewall (WAF) or Intrusion Detection System (IDS) as a temporary mitigation measure. These systems can be configured to detect and block malicious HTTP POST requests sent to exploit this vulnerability. For a permanent solution, consider upgrading to a supported version of the product or switching to a different product entirely.