Table of Contents:
Technical Details and Impact
Affected Products
Exploitation and Real-World Impact
Relationship to Other VMware Vulnerabilities
Mitigation and Recommendations
Broader Context and Significance
Summary
FAQ

CVE-2025-22226: Unveiling the VMware Information Disclosure Vulnerability

Is your VMware infrastructure secure? A critical flaw, CVE-2025-22226, puts sensitive information at risk in VMware ESXi, Workstation, also Fusion.

This dangerous vulnerability allows unauthorized access to memory contents.

Technical Details and Impact

The root cause of CVE-2025-22226 is an out-of-bounds read vulnerability located inside HGFS. HGFS is the part that is responsible for file sharing between host systems and guest virtual machines. Because of this defect, an attacker who already possesses virtual machine management permissions has a chance to read memory regions outside their allowed limits.

This unauthorized memory access is a major threat. After all, it results in the revealing of secret information. Such information consists of cryptographic keys, passwords, as well as other confidential data held in memory.

• CVSS v3.0 Base Score– 7.1 (High Severity)
• Some score it as medium: 6.0.
• Existing management permissions needed for attacks.

Affected Products

CVE-2025-22226 has an impact on a number of VMware products, also versions. They include:

• VMware ESXi 7.0 and 8.0
• VMware Cloud Foundation 4.5.x or 5.x
• VMware Telco Cloud Platform versions 2.x up to 5.x
• VMware Telco Cloud Infrastructure 2.x or 3.x
• VMware Workstation 17.x
• VMware Fusion 13.x

These products form the base in enterprise data centers, cloud infrastructures, so telecommunications environments. That is why the vulnerability is very dangerous for organizations that depend on VMware virtualization.

Exploitation and Real-World Impact

This vulnerability is currently being exploited. This exploitation was reported by NSFOCUS CERT and the Cybersecurity, also Infrastructure Security Agency (CISA). Since attackers take advantage of this flaw to get unauthorized access to memory contents, there is an increased risk.

CISA has added CVE-2025-22226 to its Known Exploited Vulnerabilities Catalog. By doing so, they show the urgency for federal agencies, also other organizations, to prioritize fixing this problem.

Relationship to Other VMware Vulnerabilities

CVE-2025-22226 is just one of three important vulnerabilities that VMware or Broadcom revealed at the same time in early 2025. The other two are:

• CVE-2025-22224– A TOCTOU race condition vulnerability lets someone execute code with VM management permissions (CVSS 9.3).
• CVE-2025-22225– An arbitrary write vulnerability allows an escape from a sandbox, but also the execution of code at the kernel level (CVSS 8.2).

While CVE-2025-22226 deals with information disclosure, the other two vulnerabilities bring higher risks of code execution or privilege escalation. If taken together, these vulnerabilities form a serious threat for VMware environments, especially if they are exploited in combination.

Mitigation and Recommendations

VMware has released patches that fix CVE-2025-22226 and the other related vulnerabilities. If you use VMware products that are affected, you should follow some advice:

• Apply security updates immediately to all affected VMware ESXi, Workstation, also Fusion installations.
• Restrict virtual machine management permissions to only trusted administrators. This reduces the chance of exploitation by unauthorized users.
• Keep an eye on systems for strange activity, specifically related to VMX processes as well as memory access patterns.
• Follow the official advice that VMware and security agencies such as CISA give.

Since the exploitation is active and the affected products are so important, you must patch as soon as possible to stop potential breaches or data leaks.

Broader Context and Significance

VMware ESXi and similar virtualization platforms are foundational technologies in modern IT. Because they allow efficient resource usage, cloud computing, or multi-tenant environments, security is key.

The out-of-bounds read vulnerability in HGFS is troubling because it bypasses access controls. It does so by exploiting errors in how memory is handled. These vulnerabilities are hard to find and used to steal secret information. This stealing occurs without leaving clear signs, which makes it harder to deal with incidents.

Also, the fact that exploitation requires virtual machine management permissions means that attackers who get in through other methods (like phishing or stolen credentials) get access to secret memory contents. With this access, they can do more damage.

Summary

CVE-2025-22226 is a very dangerous information disclosure vulnerability in VMware ESXi, Workstation, but also Fusion. It is caused by an out-of-bounds read in HGFS.

It allows attackers who possess virtual machine management privileges to access unauthorized memory information. That poses large risks to the confidentiality of virtualized environments. Since the vulnerability is being actively exploited, you should patch immediately as well as mitigate the risks.

FAQ

What exactly is an “out-of-bounds read”?

An out-of-bounds read happens when software reads memory outside of the area it’s supposed to access. This reveals secret information.

How do I know if I’m affected?

Check if you are using one of the affected products. Then follow the mitigation steps

What should I do right now?

The very first step is to patch the vulnerable components

Resources & References:

1. https://nsfocusglobal.com/vmware-esxi-workstation-fusion-multiple-high-risk-vulnerabilitiescve-2025-22224-cve-2025-22225-cve-2025-22226/
2. https://www.cisa.gov/news-events/alerts/2025/03/04/cisa-adds-four-known-exploited-vulnerabilities-catalog
3. https://www.tenable.com/cve/CVE-2025-22226
4. https://www.rapid7.com/blog/post/2025/03/04/etr-multiple-zero-day-vulnerabilities-in-broadcom-vmware-esxi-and-other-products/
5. https://its.ny.gov/2025-019