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CVE-2025-41251: Unveiling VMware NSX’s Weak Password Recovery Mechanism Vulnerability

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Overview

In today’s digital landscape, cybersecurity has become a top priority for businesses and organizations. A single vulnerability can open the door to catastrophic data breaches and system compromises. This blog post delves into one such vulnerability, CVE-2025-41251, a critical weakness found within VMware NSX’s password recovery mechanism. This vulnerability threatens numerous versions of VMware NSX and VMware Cloud Foundation, and if unaddressed, could lead to potential system compromise or data leakage. With a CVSS Severity Score of 8.1, this vulnerability is one that cannot be overlooked.

Vulnerability Summary

CVE ID: CVE-2025-41251
Severity: Important, CVSSv3: 8.1 (High)
Attack Vector: Remote, unauthenticated
Privileges Required: None
User Interaction: None
Impact: Username enumeration leading to credential brute force risk, potential system compromise or data leakage.

Affected Products

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Product | Affected Versions

VMware NSX | 9.x.x.x, 4.2.x, 4.1.x, 4.0.x
NSX-T | 3.x
VMware Cloud Foundation (with NSX) | 5.x, 4.5.x

How the Exploit Works

The vulnerability lies within the password recovery mechanism of VMware’s NSX product. An unauthenticated attacker could exploit this vulnerability to enumerate valid usernames potentially. This enumeration process could then help facilitate a brute-force attack by trying combinations of usernames and passwords until the correct one is found. Given that the attack can be carried out remotely, it significantly increases the risk associated with this vulnerability.

Conceptual Example Code

A conceptual example of how the vulnerability might be exploited could be a crafted HTTP request to the password recovery endpoint. An example would look like this:

GET /password_recovery HTTP/1.1
Host: target.example.com
{ "username": "admin" }

This request would return a response that could inadvertently reveal whether the username “admin” is valid or not, thereby enabling username enumeration.

Impact Summary

If successfully exploited, CVE-2025-41251 could lead to a severe security breach. The malicious actor could potentially gain unauthorized access to the system, leading to system compromise or data leakage.

Mitigation Guidance

Given the severity of the vulnerability, users are advised to apply the vendor patch immediately. VMware has released fixed versions for the affected products: NSX 9.0.1.0, 4.2.2.2/4.2.3.1, 4.1.2.7; NSX-T 3.2.4.3; and a CCF async patch (KB88287). In scenarios where immediate patching is not possible, using a Web Application Firewall (WAF) or an Intrusion Detection System (IDS) could serve as temporary mitigation. However, these should not be considered long-term solutions as they do not address the root cause of the vulnerability.

Acknowledgments

This vulnerability was reported by the National Security Agency, highlighting the importance of collaborative efforts in enhancing cybersecurity across the board.

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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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