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Servers and applications

CVE-2021-21986

The vSphere Client (HTML5) contains a vulnerability in a vSphere authentication mechanism for the Virtual SAN Health Check, Site Recovery, vSphere Lifecycle Manager, and VMware Cloud Director Availability plug-ins. A malicious actor with network access to port 443 on vCenter Server may perform actions allowed by the impacted plug-ins without authentication.

Severity
Critical 9.8
Published
26 May 2021
Last changed
17 Jun 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-update2
  • Version 7.0-update1d
  • Version 7.0-update1
  • Version 7.0-d
All 51 release lines
  • Version 6.5-a
  • Version 6.5-b
  • Version 6.5-c
  • Version 6.5-update1b
  • Version 6.5-update1c
  • 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-update1
  • 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 6.5-update3n
  • 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 6.7-update3l
  • Version 6.7-update3m
  • Version 7.0-a
  • Version 7.0-b
  • Version 7.0-c
  • Version 7.0-update1a
  • Version 7.0-update1c
  • Version 7.0-update2a
  • Version 7.0
  • Version 7.0-d
  • Version 7.0-update1
  • Version 7.0-update1d
  • Version 7.0-update2

References

  • NVD https://nvd.nist.gov/vuln/detail/CVE-2021-21986
  • CVE.org https://www.cve.org/CVERecord?id=CVE-2021-21986