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Servers and applications

CVE-2021-21991

The vCenter Server contains a local privilege escalation vulnerability due to the way it handles session tokens. A malicious actor with non-administrative user access on vCenter Server host may exploit this issue to escalate privileges to Administrator on the vSphere Client (HTML5) or vCenter Server vSphere Web Client (FLEX/Flash).

Severity
High 7.8
Published
22 Sept 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 54 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 6.5-update3p
  • 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 6.7-update3n
  • 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-update2b
  • 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-2021-21991
  • CVE.org https://www.cve.org/CVERecord?id=CVE-2021-21991