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Findings

CVE-2021-21973

VMware vCenter Server and Cloud Foundation Server Side Request Forgery (SSRF) Vulnerability

Published Feb 24, 2021 · updated Jun 16, 2026 · vmware cloud foundation

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).

Timeline

Detection, updates, and resolution for this record.

  1. Feb 24, 2021 · Catalog

    Detected

    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

  2. Mar 7, 2022 · CISA KEV

    Known exploited

    Apply updates per vendor instructions.

  3. Mar 21, 2022 · CISA KEV

    Remediation due

    Apply updates per vendor instructions.

  4. Jun 16, 2026 · Catalog

    Updated

    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

Required action

Apply updates per vendor instructions.

CISA due date Mar 21, 2022

Affected

  • cpe vmware/cloud foundationversion unspecified
  • cpe vmware/vcenter server6.5
  • vendor VMware vCenter Server and Cloud Foundationversion unspecified

Sources

  • CISA KEVCVE-2021-21973

    VMware vCenter Server and Cloud Foundation Server contain a SSRF vulnerability due to improper validation of URLs in a vCenter Server plugin. This allows for information disclosure.

    cisa.gov
  • CVE.orgCVE-2021-21973

    Official CVE identifier

    cve.org
  • FIRST EPSSCVE-2021-21973

    30-day exploitation probability 88.0%

    first.org
  • NIST NVDCVE-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 leadi

    nvd.nist.gov

References