Advisory Published


First published: Wed Feb 16 2022(Updated: )

VMware ESXi contains a TOCTOU (Time-of-check Time-of-use) vulnerability that exists in the way temporary files are handled. A malicious actor with access to settingsd, may exploit this issue to escalate their privileges by writing arbitrary files.

Credit: security@vmware.com

Affected SoftwareAffected VersionHow to fix
VMware Fusion<4.4
VMware ESXi=7.0-update_1
VMware ESXi=7.0-update_2
VMware ESXi=7.0-update_3

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Frequently Asked Questions

  • What is CVE-2021-22043?

    CVE-2021-22043 is a TOCTOU vulnerability in VMware ESXi that allows a malicious actor to escalate privileges by writing arbitrary files.

  • How does CVE-2021-22043 affect VMware Fusion?

    CVE-2021-22043 affects VMware Fusion version 4.4 and prior.

  • How does CVE-2021-22043 affect VMware ESXi?

    CVE-2021-22043 affects VMware ESXi version 7.0-update_1, 7.0-update_2, and 7.0-update_3.

  • What is the severity of CVE-2021-22043?

    CVE-2021-22043 has a severity value of 7.5 (high).

  • Is there a fix available for CVE-2021-22043?

    Yes, VMware has released a security advisory (VMSA-2022-0004) that provides the necessary patches to address the vulnerability.


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