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Servers and applications

CVE-2021-21972

The vSphere Client (HTML5) contains a remote code execution vulnerability in a vCenter Server plugin. A malicious actor with network access to port 443 may exploit this issue to execute commands with unrestricted privileges on the underlying operating system that hosts vCenter Server. This affects VMware vCenter Server (7.x before 7.0 U1c, 6.7 before 6.7 U3l and 6.5 before 6.5 U3n) and VMware…

Actively exploited: CISA added it to its Known Exploited Vulnerabilities catalog on 3 Nov 2021.

Severity
Critical 9.8
Published
24 Feb 2021
Last changed
12 Aug 2026
Added to UpHeron
1 Nov 2026
Sources
NVD

Affected software

SoftwareAffected versions
VMware vCenter ServerServers and applications · cpe:a:vmware:vcenter_server
  • Version 7.0-update1
  • Version 7.0-d
  • Version 7.0
  • Version 7.0-update1a
All 41 release lines
  • Version 6.5-a
  • Version 6.5-b
  • Version 6.5-c
  • Version 6.5-update2b
  • Version 6.5-update2c
  • Version 6.5
  • Version 6.5-d
  • Version 6.5-e
  • Version 6.5-f
  • Version 6.5-update1d
  • Version 6.5-update1e
  • Version 6.5-update1g
  • Version 6.5-update2
  • Version 6.5-update2d
  • Version 6.5-update2g
  • Version 6.5-update3
  • Version 6.5-update3d
  • Version 6.5-update3f
  • Version 6.5-update3k
  • Version 6.7-a
  • Version 6.7-b
  • Version 6.7-update1b
  • Version 6.7-update2a
  • Version 6.7-update2c
  • Version 6.7-update3a
  • Version 6.7-update3b
  • Version 6.7
  • Version 6.7-d
  • Version 6.7-update1
  • Version 6.7-update2
  • Version 6.7-update3
  • Version 6.7-update3f
  • Version 6.7-update3g
  • Version 6.7-update3j
  • Version 7.0-a
  • Version 7.0-b
  • Version 7.0-c
  • Version 7.0-update1a
  • Version 7.0
  • Version 7.0-d
  • Version 7.0-update1

Known exploited

CISA name
VMware vCenter Server Remote Code Execution Vulnerability
Required action
Apply updates per vendor instructions.
Due for US agencies
17 Nov 2021
Used in ransomware
Yes, known

References

  • NVD https://nvd.nist.gov/vuln/detail/CVE-2021-21972
  • CVE.org https://www.cve.org/CVERecord?id=CVE-2021-21972