CVE-2020-3950

What the flaw is

VMware Fusion, Remote Console (VMRC) for Mac, and Horizon Client for Mac contain a privilege escalation vulnerability due to improper use of setuid binaries that allows attackers to escalate privileges to root.

Description as published by CISA. We have not independently reproduced it.

What CISA requires

Apply updates per vendor instructions.

This deadline is binding on US federal civilian agencies under BOD 22-01. It is not a legal deadline for anyone else, but it is a useful urgency signal — CISA sets it by how actively the flaw is being used, not by CVSS.

Public exploit code

8 public repositories referencing this CVE have been catalogued on GitHub. Treat this as a strong signal to prioritise patching, not as a verified working exploit — many such repositories are scanners, write-ups or forks rather than functional code.

• ARPSyndicate/cvemon
• Ostorlab/KEV
• Ostorlab/known_exploited_vulnerbilities_detectors
• hackerhouse-opensource/exploits
• lnick2023/nicenice
• mirchr/security-research
• qazbnm456/awesome-cve-poc
• xbl3/awesome-cve-poc_qazbnm456

Vendor advisories

• nvd.nist.gov/vuln/detail/CVE-2020-3950

Primary sources

• NVD entry — CVSS score, CPE list and references
• CISA KEV catalog — the source for this page
• CVE Record at cve.org