CVE-2021-21973n/a VMware vCenter Server
NVD
Vulnerability Summary
The vSphere Client (HTML5) contains an SSRF (Server Side Request Forgery) vulnerability due to improper validation of URLs in a vCenter Server plugin. A malicious actor with network access to port 443 may exploit this issue by sending a POST request to vCenter Server plugin leading to information disclosure. 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).
Affected & Patched Versions
- n/a VMware vCenter Server 7.x before 7.0 U1c
- n/a VMware vCenter Server 6.7 before 6.7 U3l
- n/a VMware vCenter Server 6.5 before 6.5 U3n
- n/a VMware Cloud Foundation 4.x before 4.2
- n/a VMware Cloud Foundation 3.x before 3.10.1.2
No patched version published yet
Until a fix ships, reduce exposure:
- Restrict access to the affected service or interface to trusted networks.
- Disable the affected feature if you do not need it.
- Watch the vendor advisory for a firmware or software update.
What to do
Patch now. CISA lists this flaw as exploited in the wild and set a federal remediation deadline of Mar 21, 2022.
- Check whether you run n/a VMware vCenter Server and which version.
- No patched version is listed yet. Limit access to the affected service to trusted networks, and disable the feature if you can.
- Subscribe to the vendor advisory so you learn when a fix ships.
- Review logs and exposed services for signs of earlier compromise.
CISA required action: Apply updates per vendor instructions.
CISA KEV Status
Listed in Known Exploited Vulnerabilities
Added: Mar 7, 2022
Remediation due: Mar 21, 2022 (deadline passed)
Remediation due: Mar 21, 2022 (deadline passed)
Timeline
- Feb 24, 2021Published
- Mar 7, 2022Added to CISA KEV catalog
- Mar 21, 2022KEV remediation due date
- Oct 21, 2025Record last modified
Score, severity and exploitation changes are tracked from the day Watchtower started logging them.
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Data last checked: Nov 15, 2026 12:06 UTC