Overview
CVE-2025-4842 is a critical vulnerability that has been found in D-Link DCS-932L 2.18.01 products. It affects the function isUCPCameraNameChanged of the file /sbin/ucp. This vulnerability is significant because of its severity and its potential for exploitation through remote access. Furthermore, it is especially concerning because it affects products that are no longer supported by the maintainer, meaning they may not receive necessary security updates to address the vulnerability.
The nature of this vulnerability, a stack-based buffer overflow, has far-reaching implications, potentially leading to system compromise or data leakage. As such, users of affected D-Link products should take immediate steps to mitigate the vulnerability, which has already been disclosed publicly.
Vulnerability Summary
CVE ID: CVE-2025-4842
Severity: Critical (CVSS Score: 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 DCS-932L | 2.18.01
How the Exploit Works
The vulnerability exists due to insufficient input validation in the isUCPCameraNameChanged function of the /sbin/ucp file. An attacker can exploit this by manipulating the CameraName argument, leading to a stack-based buffer overflow. This overflow may allow the attacker to execute arbitrary code within the context of the affected application, ultimately leading to potential system compromise or data leakage.
Conceptual Example Code
Below is a conceptual example of how an attacker might exploit the vulnerability. This code is for illustrative purposes only and does not represent a real exploit.
POST /isUCPCameraNameChanged HTTP/1.1
Host: target.example.com
Content-Type: application/json
{ "CameraName": "AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA...[more A's to overflow the buffer]...AAA" }In this example, the attacker sends an HTTP POST request with a manipulated CameraName argument. By sending a large number of ‘A’ characters, the attacker can overflow the buffer and potentially gain control over the system.
Recommended Mitigation
Users of the affected D-Link products are recommended to apply any available vendor patches immediately. In the absence of a vendor patch, users may use a Web Application Firewall (WAF) or Intrusion Detection System (IDS) as a temporary mitigation measure. However, these solutions do not fully resolve the vulnerability and only reduce the risk of exploitation.