CVE-2021-21973The vSphere Client (HTML5) contains an SSRF (Server Side Request Forgery) vulnerability due to improper validation of URLs in a vCenter Server plugin.
Updated under an hour ago ()
Does this affect you?
It affects vmware cloud_foundation and 1 other product. Add what you run to find out whether that includes you.
CISA lists it as known exploited since Mar 7, 2022; federal agencies had to remediate by Mar 21, 2022. Treat that date as your deadline.
Do this next
Free account, 1 product
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).
- CVSS
- 5.3 MEDIUM (v3.1, CISA ADP)CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N
- Weakness (CWE)
- CWE-918
- Known exploited
- Added to CISA KEV Mar 7, 2022; federal remediation due Mar 21, 2022Apply updates per vendor instructions.
- EPSS (exploitation in the next 30 days)
- 88.01% (percentile 100)
- Assigned by
- vmware
- NVD analysis
- Analyzed
- Record last updated
- Oct 21, 2025
- First seen by InfoSec Signals
- Oct 9, 2026
Affected products
vmware cloud_foundation vmware:cloud_foundation | from 3.0 before 3.10.1.2; from 4.0 before 4.2 | NVD |
vmware vcenter_server vmware:vcenter_server | 6.5; 6.5; 6.5; 6.5; 6.5; 6.5; 6.5; 6.5; and 33 more ranges | NVD |
References
- https://www.vmware.com/security/advisories/VMSA-2021-0002.htmlx-refsource-confirm, vendor-advisory
- https://www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2021-21973us-government-resource
The CVE record on cve.org NVD's entry
The CVE record is authoritative. Products marked “from the name” were identified from the CNA's free-text names, not a CPE, and are matched less certainly. This product uses the NVD API but is not endorsed or certified by the NVD.