CVE-2021-21973 in VMware vCenter Server and Cloud Foundation: exploited now
Attackers are exploiting CVE-2021-21973 in VMware vCenter Server and Cloud Foundation. CISA has listed it as known exploited since 7 March 2022.
| Product | VMware vCenter Server and Cloud Foundation |
|---|---|
| Known exploited since | 7 March 2022 |
| Ransomware use | Not recorded |
| EU vulnerability database | EUVD-2021-9144 |
| Sources | NVD · CISA KEV |
What it means
Attackers have used this vulnerability in real attacks. An unpatched VMware vCenter Server and Cloud Foundation that can be reached from the internet is exposed to them.
What to do
- Find every system running VMware vCenter Server and Cloud Foundation, starting with those reachable from the internet.
- Apply the vendor's fix, or take the system off the internet until you can.
- Check the system for signs that it was reached before the fix.
How Vardion finds it
Wherever a scan or your imported scanner results find CVE-2021-21973, Vardion names the systems affected and puts the fix at the top of the list.
Know before an attacker does
Vardion checks your servers, websites, domains and leaked staff accounts on the schedule you set and tells you what to fix first, in plain words.
From CISA's known exploited vulnerabilities catalogue as it stood on 4 October 2026.