CVE-2021-21973
VMware vCenter Server, VMware Cloud Foundation
Published 24 Feb 2021 · updated 17 Jun 2026 · Analyzed
Exploited in the wild
CISA added this to its Known Exploited Vulnerabilities catalog on 7 Mar 2022, with a remediation deadline of 21 Mar 2022 for US federal agencies.
Required action: Apply updates per vendor instructions.
Description
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 before 6.5 U3n) and VMware Cloud Foundation (4.x before 4.2 and 3.x before 3.10.1.2).
References
- www.vmware.com/security/advisories/VMSA-2021-0002.html · Vendor Advisory
- www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2021-21973 · US Government Resource