{"cve":"CVE-2021-21973","nvd":{"published":"2021-02-24T17:15:15.923","modified":"2026-06-17T03:36:28.910","status":"Analyzed","description":"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_v4":null,"cvss_v3":{"version":"3.1","vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N","score":5.3},"cwes":["CWE-918"],"references":["https://www.vmware.com/security/advisories/VMSA-2021-0002.html","https://www.vmware.com/security/advisories/VMSA-2021-0002.html","https://www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2021-21973"],"products":["vmware:cloud_foundation","vmware:vcenter_server"],"source":"nvd","synced_at":"2026-10-19T21:15:50.279857260+00:00"},"epss":{"cve":"CVE-2021-21973","score":0.88012,"percentile":0.99764,"date":"2026-11-01"},"kev":{"cve":"CVE-2021-21973","date_added":"2022-03-07","due_date":"2022-03-21","vendor":"VMware","product":"vCenter Server and Cloud Foundation","known_ransomware":false},"osv":[],"attribution":["This product uses the NVD API but is not endorsed or certified by the NVD.","EPSS scores: FIRST Exploit Prediction Scoring System, https://www.first.org/epss","Known exploited vulnerabilities: CISA Known Exploited Vulnerabilities Catalog, https://www.cisa.gov/known-exploited-vulnerabilities-catalog","Package advisories: OSV (https://osv.dev), from the GitHub Advisory Database, PyPA, Go, RustSec and other ecosystem databases, under CC-BY 4.0 or CC0","CVE records: the CVE Program's CVE List (https://www.cve.org), under its terms of use (https://www.cve.org/Legal/TermsOfUse). CVE is a registered trademark of The MITRE Corporation; this product is not affiliated with the CVE Program."]}