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CVE-2025-21120: Trusting HTTP Permission Methods on the Server-Side Vulnerability in Dell Avamar

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Overview

In the ever-expanding landscape of cybersecurity, new vulnerabilities continue to emerge, posing significant threats to organizations and their infrastructures. One such vulnerability, CVE-2025-21120, affects Dell Avamar, a popular data protection software solution. With potential risks including system compromise and data leakage, it’s crucial for IT security teams to understand and mitigate this vulnerability.
This specific vulnerability affects Dell Avamar versions prior to 19.12 with patch 338905, excluding version 19.10SP1 with patch 338904. It involves a trusting HTTP permission method on the server-side, which could be exploited by a low privileged attacker with remote access. The potential risks are significant, making it a significant concern for IT security teams.

Vulnerability Summary

CVE ID: CVE-2025-21120
Severity: High (8.3 CVSS Score)
Attack Vector: Network
Privileges Required: Low
User Interaction: None
Impact: Potential system compromise and data leakage

Affected Products

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Product | Affected Versions

Dell Avamar | Versions prior to 19.12 with patch 338905, excluding version 19.10SP1 with patch 338904

How the Exploit Works

The vulnerability lies in the server-side HTTP permission method that Avamar trusts. An attacker with low-level privileges and remote access can exploit this vulnerability by sending crafted HTTP requests to the server. Since the server trusts these permission methods, it does not adequately verify the requests, leading to potential information exposure.

Conceptual Example Code

The vulnerability might be exploited using a simple HTTP request like the following:

POST /avamar-endpoint HTTP/1.1
Host: target.example.com
Content-Type: application/json
{ "malicious_payload": "Exploit_Code_Here" }

In this example, the malicious payload would be carefully crafted to exploit the vulnerability, making the server execute actions that would lead to information exposure or potentially even full system compromise.

Recommendations for Mitigation

To mitigate this vulnerability, users are advised to apply the vendor patch (338905 for versions prior to 19.12, and 338904 for version 19.10SP1). In the absence of the patch, using a Web Application Firewall (WAF) or an Intrusion Detection System (IDS) could provide temporary mitigation by monitoring and blocking suspicious activities. However, it’s essential to apply the vendor patch as soon as possible to effectively 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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