CVE-2021-21985 KEV
9.8
CRITICAL · CVSS 3.1 · EPSS 100% (pctl 100)
Patch first
On CISA KEV — known exploited in the wild, due 2021-11-17.
Description
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.
Scoring
| CVSS | 9.8 (CRITICAL, v3.1) |
|---|---|
| Vector | CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H |
| EPSS | 100% — more likely to be exploited than 100% of all CVEs |
| Weakness | CWE-918 |
| On CISA KEV | yes — remediate by 2021-11-17 |
| Public exploit | none known |
| Published | 2021-05-26 |
| Last modified | 2026-08-12 |
CISA KEV
| Name | VMware vCenter Server Improper Input Validation Vulnerability |
|---|---|
| Added | 2021-11-03 |
| Due | 2021-11-17 |
| Vendor / product | VMware / vCenter Server |
| Ransomware use | known |
Affected (2)
| Vendor | Product |
|---|---|
| vmware | cloud foundation |
| vmware | vcenter server |
References
- http://packetstormsecurity.com/files/162812/VMware-Security-Advisory-2021-0010.html
- http://packetstormsecurity.com/files/163487/VMware-vCenter-Server-Virtual-SAN-Health-Check-Remote-Code-Execution.html
- https://www.vmware.com/security/advisories/VMSA-2021-0010.html
- http://packetstormsecurity.com/files/162812/VMware-Security-Advisory-2021-0010.html
- http://packetstormsecurity.com/files/163487/VMware-vCenter-Server-Virtual-SAN-Health-Check-Remote-Code-Execution.html
- https://www.vmware.com/security/advisories/VMSA-2021-0010.html
- https://www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2021-21985
→ the Explorer · watch your stack · NVD