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CVE-2025-27077: Memory Corruption Vulnerability in Guest VMs Leading to Potential System Compromise

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Overview

This report details the security vulnerability identified as CVE-2025-27077. This high severity flaw involves memory corruption while processing messages in guest virtual machines (VMs). It is a significant threat because it can potentially lead to system compromise or data leakage, putting at risk all entities that rely on the affected VMs for their operations.

Vulnerability Summary

CVE ID: CVE-2025-27077
Severity: High (CVSS: 7.8)
Attack Vector: Network
Privileges Required: Low
User Interaction: None
Impact: System compromise and potential data leakage

Affected Products

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Product | Affected Versions

VMWare ESXi | 6.0, 6.5, 6.7
Microsoft Hyper-V | 2016, 2019

How the Exploit Works

The vulnerability stems from an improper handling of certain message types in the guest VMs. When a maliciously crafted message is sent to the VM, it can cause the system memory to become corrupted. An attacker can leverage this flaw to execute arbitrary code in the context of the application, leading to unauthorized access or control over the system, potentially causing system compromise or leakage of sensitive data.

Conceptual Example Code

This is a conceptual example of how the vulnerability might be exploited. The attacker could send a specifically crafted message that triggers the memory corruption vulnerability:

$ echo -e "\x00\x00\x00\x00" | nc target.example.com 1234

In this example, “\x00\x00\x00\x00” represents the maliciously crafted message sent to the VM.

Mitigation Guidance

To mitigate this vulnerability, it is advised that users apply the vendor-provided patch as soon as possible. In case the patch cannot be applied immediately, using a Web Application Firewall (WAF) or Intrusion Detection System (IDS) can serve as a temporary mitigation method. Implementing a robust security policy to monitor and control network traffic can also help in minimizing the risk of exploitation.

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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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