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CVE-2025-59537: Argo CD API Server Vulnerability Leading to Denial of Service

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Overview

The CVE-2025-59537 vulnerability affects Argo CD, a GitOps continuous delivery tool for Kubernetes. This vulnerability is of great concern due to its potential to crash the API server and cause a denial of service to legitimate clients. If exploited, it could lead to system compromise or data leakage, posing a significant risk to organizations using the affected versions of Argo CD.

Vulnerability Summary

CVE ID: CVE-2025-59537
Severity: High (CVSS: 7.5)
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

Argo CD | 1.2.0 through 1.8.7, 2.0.0-rc1 through 2.14.19, 3.0.0-rc1 through 3.2.0-rc1, 3.1.7 and 3.0.18

How the Exploit Works

The vulnerability stems from a flaw in Argo CD’s handling of API requests. With the default configuration, Argo CD’s /api/webhook endpoint will crash the entire argocd-server process when it receives a Gogs push event whose JSON field commits[].repo is not set or is null. This can be exploited by an attacker to send a malicious API request that crashes the API server and causes a denial of service.

Conceptual Example Code

Below is a conceptual example of a malicious HTTP POST request exploiting the vulnerability:

POST /api/webhook HTTP/1.1
Host: target.example.com
Content-Type: application/json
{
"commits": [
{
"repo": null
}
]
}

Mitigation Measures

To mitigate this vulnerability, users are advised to apply the vendor patch in versions 2.14.20, 3.2.0-rc2, 3.1.8 and 3.0.19. In the interim, use of a Web Application Firewall (WAF) or Intrusion Detection System (IDS) can serve as a temporary mitigation measure.

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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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