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CVE-2021-21985

Critical · CVSS 9.8EPSS 100.0%CISA KEVCWE-918 · Server-Side Request Forgery (SSRF)

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

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.

References

NVD MITRE CVE.org CISA KEV

Published

Community ground truth

Community verdict

3 verdicts
Not a real issue

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Community real-world severity: Critical (Critical 3) — CVSS base score 9.8

In line with its CVSS base score.

Field notes & remediation

Verdicts are the quick signal — notes are the evidence and fixes behind them.

  • 0
    Field note · Marco FerriCurated

    Confirmed exploited in the wild — listed in the CISA KEV catalog (added 2021-11-03). Linked to known ransomware campaigns. Treat as real and prioritize patching over triage.