No exploitation reportedFix available

CVE-2021-22009

Q: Is CVE-2021-22009 actively exploited?

Active exploitation of CVE-2021-22009 has not been confirmed. Its EPSS score was 1.4% on 2026-10-23, the estimated probability of exploitation in the next 30 days.

Q: What is the CVSS score for CVE-2021-22009?

CVE-2021-22009 has a CVSS v3 base score of 7.5 (HIGH severity), with vector string CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H.

No exploitation reported by the sources we read.

Published2021-09-23
WeaknessCWE-668

Am I affected?

With a domain, we read the version its public headers and pages expose. A distribution build can carry the fix under an older number.

Description

The vCenter Server contains multiple denial-of-service vulnerabilities in VAPI (vCenter API) service. A malicious actor with network access to port 443 on vCenter Server may exploit these issues to create a denial of service condition due to excessive memory consumption by VAPI service.

Timeline

dates in UTC

2021-09-2312:15CVE publishedNVD

Observed activity

isMalicious corpus · updated 2026-10-23 21:37 UTC

Indicators tagged with this CVE, per day0 indicators over 7 days

Block these indicators

Firewall list (EDL, text): https://api.ismalicious.com/edl/cve/CVE-2021-22009?format=txt
CSV export: https://api.ismalicious.com/edl/cve/CVE-2021-22009?format=csv
TAXII collection of exploited CVEs
The EDL and CSV take an API key on the Pro plan.

Versions per branch

NVD

Vmware vcenter server

Branch	Affected	Fixed in	Source
6.7	= 6.7	no fix published	NVD
7.0	= 7.0	no fix published	NVD

Vmware cloud foundation

Branch	Affected	Fixed in	Source
5.0	≥ 3.0, < 5.0	5.0	NVD

as publishedRanges as NVD and OSV publish them; a distribution’s build can be fixed under an older number.

Fix

Advisories and patches

www.vmware.comPatch · Vendor Advisory

Detection

Nuclei template: none so far
Exploit-DB: no entry
Proof-of-concept repositories: none listed

Sources

NVDCVSS 3.17.5read 2026-10-23
NVDCVSS 2.05read 2026-10-23
NVDweakness (CWE)CWE-668read 2026-10-23
FIRST EPSSEPSS score1.4 %2026-10-23

Technical details

CVSS v3 Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
Published: 2021-09-23
Last Modified: 2026-06-17
NVD status: Modified

Frequently asked questions

What is CVE-2021-22009?

Is CVE-2021-22009 actively exploited?

Active exploitation of CVE-2021-22009 has not been confirmed. Its EPSS score was 1.4% on 2026-10-23, the estimated probability of exploitation in the next 30 days.

What is the CVSS score for CVE-2021-22009?

CVE-2021-22009 has a CVSS v3 base score of 7.5 (HIGH severity), with vector string CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H.

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