# CVE-2021-21973

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).

- Page: https://www.vulneraibility.com/cve/CVE-2021-21973
- CVSS: 5.3
- Known exploited: yes, in CISA KEV since 2022-03-07; CISA due date 2022-03-21
- EPSS: 88.01% (percentile 99.8)
- Unvetted proof-of-concept code on GitHub: 1 GitHub proof of concept · 1 Nuclei template (first 2021-03-16)
- CISA SSVC: exploitation active, automatable yes, technical impact partial (assessed 2024-02-16)
- Weakness: CWE-918
- Published: 2021-02-24

## Affected versions

- VMware Cloud Foundation: affected 4.x before 4.2; 3.x before 3.10.1.2
- VMware vCenter Server: affected 7.x before 7.0 U1c; 6.7 before 6.7 U3l; 6.5 before 6.5 U3n

A version outside these ranges is not a statement that it is unaffected.

## References

- [other] https://www.vmware.com/security/advisories/VMSA-2021-0002.html
- [other] https://www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2021-21973

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Summary, impact and action are written by the vulneraibility.com AI analysis pipeline from the CVE record, NVD, CISA and FIRST data; verify against the references.