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CVE-2025-45851: Denial of Service Vulnerability in Hikvision DS-2CD1321-I Camera

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Overview

This report details a significant cybersecurity vulnerability, CVE-2025-45851, found in Hikvision’s DS-2CD1321-I V5.7.21 build 230819. The vulnerability can cause a Denial of Service (DoS) attack, which could potentially lead to system compromise or data leakage. Any organization utilizing this product version should immediately address this issue to avoid potential disruption and data loss.

Vulnerability Summary

CVE ID: CVE-2025-45851
Severity: High (7.5 CVSS Score)
Attack Vector: Network
Privileges Required: None
User Interaction: None
Impact: Denial of Service, Potential system compromise or data leakage

Affected Products

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Product | Affected Versions

Hikvision DS-2CD1321-I | V5.7.21 build 230819

How the Exploit Works

The exploit works by sending a specially crafted POST request to the endpoint /ISAPI/Security/challenge on a device running the vulnerable software. This malformed request causes the system to crash, resulting in a Denial of Service (DoS) condition.

Conceptual Example Code

Below is a conceptual example of how the vulnerability might be exploited. This is a sample HTTP request:

POST /ISAPI/Security/challenge HTTP/1.1
Host: target.example.com
Content-Type: application/json
{ "malicious_payload": "..." }

In this example, the “malicious_payload” is intentionally left vague. In a real-world scenario, this would contain the crafted data that triggers the vulnerability, leading to a Denial of Service.

Mitigation

The vendor, Hikvision, has released an update (V5.7.23_SP2) that fixes this vulnerability. Users are strongly advised to apply this patch immediately. Until the patch can be applied, users can use a Web Application Firewall (WAF) or an Intrusion Detection System (IDS) as a temporary mitigation measure. However, these are not long-term solutions and do not eliminate the vulnerability.

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Disclaimer:

The information and code presented in this article are provided for educational and defensive cybersecurity purposes only. Any conceptual or pseudocode examples are simplified representations intended to raise awareness and promote secure development and system configuration practices.

Do not use this information to attempt unauthorized access or exploit vulnerabilities on systems that you do not own or have explicit permission to test.

Ameeba and its authors do not endorse or condone malicious behavior and are not responsible for misuse of the content. Always follow ethical hacking guidelines, responsible disclosure practices, and local laws.

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