Zero-Days in VMware: What You Should Know

On March 4, Broadcom — which acquired VMware in 2023 — published a critical security advisory detailing three zero-day vulnerabilities affecting multiple core VMware products, including ESX, VMware Workstation, and VMware Fusion. Having three zero-days disclosed together in a single advisory is unusual; most disclosures involve a single flaw.

An important mitigating detail: none of these vulnerabilities are remotely exploitable. An attacker must already have privileged (admin/root) access inside a virtual machine running on an affected hypervisor before any of these flaws can be leveraged. This means the risk is concentrated in post-exploitation activity rather than initial access — but it remains a serious concern for anyone managing virtualized environments, especially multi-tenant ones such as cloud providers or shared enterprise datacenters.

One of the core security benefits of virtualization is isolation — the guarantee that a workload running inside one virtual machine cannot affect the host system or other virtual machines sharing the same physical infrastructure. This isolation is especially critical in cloud environments and enterprise datacenters where multiple customers...