# CVE-2021-21985

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.

- Page: https://www.vulneraibility.com/cve/CVE-2021-21985
- CVSS: 9.8
- Known exploited: yes, in CISA KEV since 2021-11-03; CISA due date 2021-11-17; known ransomware use
- EPSS: 100.00% (percentile 100.0)
- Public exploit code: 1 Metasploit module · 10 GitHub proofs of concept · 1 Nuclei template (first 2021-05-27)
- CISA SSVC: exploitation active, automatable yes, technical impact total (assessed 2021-05-26)
- Weakness: CWE-20, CWE-470, CWE-918
- Published: 2021-05-26

## Affected versions

- VMware vCenter Server and VMware Cloud Foundation: affected VMware vCenter Server (7.x before 7.0 U2b, 6.7 before 6.7 U3n, 6.5 before 6.5 U3p) and VMware Cloud Foundation (4.x before 4.2.1, 3.x before 3.10.2.1)

A version outside these ranges is not a statement that it is unaffected.

## References

- [other] https://www.vmware.com/security/advisories/VMSA-2021-0010.html
- [other] http://packetstormsecurity.com/files/162812/VMware-Security-Advisory-2021-0010.html
- [other] http://packetstormsecurity.com/files/163487/VMware-vCenter-Server-Virtual-SAN-Health-Check-Remote-Code-Execution.html
- [other] https://www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2021-21985

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Summary, impact and action are written by the vulneraibility.com AI analysis pipeline from the CVE record, NVD, CISA and FIRST data; verify against the references.