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CVE-2025-56571: Denial of Service Vulnerability in Finance.js v4.1.0

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Overview

This report aims to cover a significant cybersecurity vulnerability, CVE-2025-56571, that affects Finance.js v4.1.0. This vulnerability is of critical concern due to its potential to cause a Denial of Service (DoS) attack through the IRR function’s depth parameter. Such an attack can result in application stalls, crashes, and, worst of all, the potential for system compromise or data leakage.

Vulnerability Summary

CVE ID: CVE-2025-56571
Severity: High (7.5 CVSS Score)
Attack Vector: Network
Privileges Required: None
User Interaction: None
Impact: Successful exploitation can lead to system compromise, data leakage, and denial of service via excessive CPU usage.

Affected Products

Product | Affected Versions

Finance.js | v4.1.0

How the Exploit Works

This exploit works by abusing the IRR function’s depth parameter in Finance.js v4.1.0. The improper handling of the recursion/iteration limit can be manipulated to cause excessive CPU usage. This overuse of resources can then lead to application stalls or crashes, effectively rendering the service unavailable, hence causing a Denial of Service (DoS). More worryingly, it could potentially lead to system compromise or data leakage.

Conceptual Example Code

A potential exploit might involve sending a manipulated payload with an excessively deep iteration request to the IRR function. This could look something like this conceptually:

POST /IRR/endpoint HTTP/1.1
Host: target.example.com
Content-Type: application/json
{ "depth": 1000000000 }

In this example, an attacker could send an HTTP POST request with a payload containing an abnormally high value for the depth parameter, causing the server to consume excessive CPU resources trying to process it.

Mitigation Guidance

The primary mitigation strategy for this vulnerability is applying the vendor-provided patch. It is recommended to update Finance.js to the latest version where this vulnerability has been addressed. In the interim, using a Web Application Firewall (WAF) or Intrusion Detection System (IDS) can help provide temporary mitigation against potential attacks exploiting this 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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