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CVE-2021-21985: VMware vCenter Server Improper Input Validation Vulnerability

criticalknown exploitedpublic exploitCVE-2021-21985
Actively exploited. At least one CVE in this advisory is listed in the CISA Known Exploited Vulnerabilities catalog — exploitation has been observed in the wild. Treat remediation as urgent.
VMware vSphere Client contains an improper input validation vulnerability in the Virtual SAN Health Check plug-in, which is enabled by default in vCenter Server, which allows for remote code execution.

CSIRTS triage

vendor: VMwareproduct: vCenter ServerRemote code execution
What
There is an improper input validation vulnerability that allows for remote code execution.
Who is affected
Deployments of VMware vSphere Client with the Virtual SAN Health Check plug-in enabled.
Urgency
Remediation is critical due to active exploitation and the severity of the vulnerability.
Action
Apply the security updates for vCenter Server.

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Details

Source
CISA Known Exploited Vulnerabilities (US · database · site)
Severity
critical
Published
2021-11-03
Exploitation
Observed in the wild (CISA KEV)

Original advisory: https://nvd.nist.gov/vuln/detail/CVE-2021-21985

Exploitation outlook

EPSS (FIRST.org) estimates each CVE’s probability of exploitation in the next 30 days — here is the CSIRTS.com read on those numbers.

Referenced CVEs

CVECSIRTS overviewExternal
CVE-2021-21985coverage & exploitation statusNVD · CVE.org

Recent advisories for VMware vCenter Server

A cluster of recent advisories against the same product widens the attack surface — attackers routinely chain freshly published CVEs on one product, so review these together.

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