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 1234In 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.
