{"id":"CVE-2021-21985","aliases":[],"url":"https://o3.security/vulnerability/CVE-2021-21985","summary":"The vSphere Client (HTML5) contains a remote code execution vulnerability due to lack of input validation in the Virtual SAN Health Check plug-in which is enabled by default in vCenter…","details":"The vSphere Client (HTML5) contains a remote code execution vulnerability due to lack of input validation in the Virtual SAN Health Check plug-in which is enabled by default in vCenter Server. 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.","published":"2021-05-26T15:15:07.937","modified":"2026-08-12T05:17:36.797","cvss":{"score":9.8,"severity":"CRITICAL","vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H"},"epss":{"score":0.99999,"percentile":0.99992,"asOf":"2026-09-16"},"cisaKev":null,"exploitsKnown":15,"affectedPackages":[],"fix":null,"references":[{"type":"ADVISORY","url":"http://packetstormsecurity.com/files/162812/VMware-Security-Advisory-2021-0010.html"},{"type":"EXPLOIT","url":"http://packetstormsecurity.com/files/163487/VMware-vCenter-Server-Virtual-SAN-Health-Check-Remote-Code-Execution.html"},{"type":"ADVISORY","url":"https://www.vmware.com/security/advisories/VMSA-2021-0010.html"},{"type":"ADVISORY","url":"http://packetstormsecurity.com/files/162812/VMware-Security-Advisory-2021-0010.html"},{"type":"EXPLOIT","url":"http://packetstormsecurity.com/files/163487/VMware-vCenter-Server-Virtual-SAN-Health-Check-Remote-Code-Execution.html"},{"type":"ADVISORY","url":"https://www.vmware.com/security/advisories/VMSA-2021-0010.html"},{"type":"WEB","url":"https://www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2021-21985"}],"provenance":{"sources":["OSV.dev","NVD","FIRST.org (EPSS)"],"lastVerified":"2026-08-12T05:17:36.797"}}