CISA KEV · Known exploitedCritical

CVE-2021-21972

VMware vCenter Server

The vSphere Client (HTML5) contains a remote code execution vulnerability in a vCenter Server plugin. 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. This affects VMware vCenter Server (7.x before 7.0 U1c, 6.7 before 6.7 U3l and 6.5 before 6.5 U3n) and VMware Cloud Foundation (4.x before 4.2 and 3.x before 3.10.1.2).

CVSS: 9.8
EPSS: 99.5%
CISA KEV: Listed
Published: 2021.02.25

PRIORITY ASSESSMENT

Immediate review

CISA has listed this vulnerability in the Known Exploited Vulnerabilities catalog.

Known exploitationConfirmed by CISA KEV

Exploit probability99.5%

Technical severityCVSS 9.8

Vulnerability overview

Affected product and versions

Product: VMware vCenter Server
Affected versions: 7.x before 7.0 U1c, 6.7 before 6.7 U3l, 6.5 before 6.5 U3n, 4.x before 4.2, 3.x before 3.10.1.2, >= 3.0 < 3.10.1.2, >= 4.0 < 4.2, 6.5, 6.7, 7.0
Fixed versions: 3.10.1.2, 4.2

Recommended response sequence

Confirm exposure before applying a vendor-supported change.

Full remediation guide

CISA required action

Apply updates per vendor instructions.

Due date: 2021.11.17

1
Identify
Confirm that VMware vCenter Server and an affected version are present.
2
Prioritize
Combine exploitation signals with asset exposure and business criticality.
3
Remediate
Follow the vendor advisory or supported update path and preserve rollback options.
4
Verify
Recheck the version, service health, access paths, and relevant logs.

Technical data

CVSS vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
CWE: CWE-22, CWE-23
KEV added: 2021.11.03
Ransomware use: 확인됨