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Denial of service in VMware ESXi, Workstation and Fusion

Published: 2020-05-29 | Updated: 2020-06-01
Severity Medium
Patch available YES
Number of vulnerabilities 1
CVE ID CVE-2020-3958
Exploitation vector Local network
Public exploit N/A
Vulnerable software
VMware ESXi
Operating systems & Components / Operating system

VMware Workstation
Client/Desktop applications / Virtualization software

VMware Fusion
Client/Desktop applications / Virtualization software

Vendor VMware, Inc

Security Advisory

Updated: 01.06.2020

Updated vulnerability description, raised severity rating to medium due to new details from Cisco Talos, updated CVSS score.

1) Reachable Assertion

Severity: Medium


CVE-ID: CVE-2020-3958

CWE-ID: CWE-617 - Reachable Assertion

Exploit availability: No


The vulnerability allows a remote user to perform a denial of service (DoS) attack.

The vulnerability exists due to reachable assertion in the shader functionality. A remote user of guest operating system can pass a malformed pixel shader (inside VMware guest OS) and perform a denial of service (DoS) attack due a panic condition in the vmware-vmx.exe process on host.


Install updates from vendor's website.

Vulnerable software versions

VMware ESXi: 6.5, 6.7

VMware Workstation: 15.0.0, 15.0.1, 15.0.2, 15.0.3, 15.0.4

VMware Fusion: 11.0.0, 11.0.1, 11.0.2, 11.0.3

CPE External links

Q & A

Can this vulnerability be exploited remotely?

Yes. This vulnerability can be exploited by a remote authenticated user via the local network (LAN).

Is there known malware, which exploits this vulnerability?

No. We are not aware of malware exploiting this vulnerability.