CVE-2025-62627: Memory Leak in VMware ESXi

The core impact of CVE-2025-62627 lies in the potential for unauthorized access to kernel and guest VM memory. An attacker, already possessing a foothold within a virtual machine, can exploit this vulnerability to read sensitive data stored in kernel memory or even within the memory space of other virtual machines sharing the same host. This could expose credentials, encryption keys, or other confidential information. Furthermore, the memory corruption caused by the untrusted pointer dereference could lead to a denial-of-service condition, rendering the ESXi host and its virtual machines unavailable. The potential for lateral movement within the virtualized environment is significant, as an attacker could leverage compromised guest VMs to target other VMs on the same host.

1. Published2026-05-13

The primary mitigation for CVE-2025-62627 is to apply the security update released by VMware in Security Advisory VMSA-2026-0009. This advisory details the patched versions for ESXi 8.0 and 9.0. If immediate patching is not feasible, consider implementing network segmentation to limit the potential blast radius of a successful attack. While not a direct fix, restricting network access to the ESXi host and its management interfaces can reduce the attack surface. Monitor ESXi host logs for any unusual activity or memory-related errors that might indicate exploitation attempts. After applying the update, verify the fix by attempting to reproduce the vulnerability in a test environment (if possible) or by reviewing VMware's verification steps outlined in VMSA-2026-0009.