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CVE-2025-59538: Critical Argo CD Vulnerability Leading to Process Crash

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Overview

The cybersecurity landscape is riddled with vulnerabilities that threaten the safety and functionality of systems. One such vulnerability, identified as CVE-2025-59538, affects the Argo CD, a GitOps continuous delivery tool for Kubernetes. This vulnerability is particularly concerning as it can crash the entire argocd-server process, potentially compromising system integrity or leading to data leakage.

Vulnerability Summary

CVE ID: CVE-2025-59538
Severity: High (7.5 CVSS)
Attack Vector: Network
Privileges Required: None
User Interaction: None
Impact: System compromise or data leakage due to crash of argocd-server process

Affected Products

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Product | Affected Versions

Argo CD | 2.9.0-rc1 through 2.14.19, 3.0.0-rc1 through 3.2.0-rc1, 3.1.6 and 3.0.17

How the Exploit Works

The vulnerability arises when the webhook.azuredevops.username and webhook.azuredevops.password are not set in the default Argo CD configuration. In this situation, if the /api/webhook endpoint receives an Azure DevOps Push event with an empty JSON array resource.refUpdates, the argocd-server process crashes. This is because the slice index [0] is accessed without a length check, leading to an out-of-index panic. A single, unauthenticated HTTP POST is sufficient to exploit this vulnerability.

Conceptual Example Code

The vulnerability might be exploited using a HTTP POST request similar to the following:

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

In this example, the `refUpdates` JSON array is intentionally left empty, exploiting the lack of length check and causing the argocd-server process to crash.

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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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