Zero-day vulnerability in VMware ESXi

Heap-based buffer overflow
CVE-2025-22224

Vulnerability details

Advisory: SB2025030423 - Multiple vulnerabilities in VMware ESXi

Vulnerable component: VMware ESXi

CVE-ID: CVE-2025-22224

CVSSv3 score: CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:C/C:H/I:H/A:H/E:H/RL:O/RC:C

CWE-ID: CWE-122 - Heap-based Buffer Overflow

Description:

The vulnerability allows a malicious guest to execute arbitrary code on the hypervisor.

The vulnerability exists due to a boundary error in VMCI. A malicious guest with administrative privileges can trigger a heap-based buffer overflow and execute arbitrary code on the hypervisor in the context of VMX process.

Note, the vulnerability is being actively exploited in the wild.

External links:

https://support.broadcom.com/web/ecx/support-content-notification/-/external/content/SecurityAdvisories/0/25390

About zero-day vulnerabilities

Zero-day vulnerability is an undisclosed vulnerability in software that hackers can exploit to compromise computer programs, gain unauthorized access to sensitive data, penetrate networks, etc. We consider vulnerability a zero-day when there is no solution provided from software vendor and the vulnerability is being actively exploited by malicious actors.

Zero-day candidate is a potential zero-day vulnerability in software which might have been used in targeted attacks, however there is no evidence to support this suggestion.