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Servers and applications

CVE-2021-21973

The vSphere Client (HTML5) contains an SSRF (Server Side Request Forgery) vulnerability due to improper validation of URLs in a vCenter Server plugin. A malicious actor with network access to port 443 may exploit this issue by sending a POST request to vCenter Server plugin leading to information disclosure. This affects: VMware vCenter Server (7.x before 7.0 U1c, 6.7 before 6.7 U3l and 6.5…

Actively exploited: CISA added it to its Known Exploited Vulnerabilities catalog on 7 Mar 2022.

Severity
Medium 5.3
Published
24 Feb 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-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 and Cloud Foundation Server Side Request Forgery (SSRF) Vulnerability
Required action
Apply updates per vendor instructions.
Due for US agencies
21 Mar 2022
Used in ransomware
Not known

References

  • NVD https://nvd.nist.gov/vuln/detail/CVE-2021-21973
  • CVE.org https://www.cve.org/CVERecord?id=CVE-2021-21973