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CVE-2021-21973

Server-Side Request Forgery (SSRF) — is CVE-2021-21973real, exploitable, or a false positive? Here's the community ground truth.

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Medium · CVSS 5.3EPSS 88.0%CISA KEVCWE-918 · Server-Side Request Forgery (SSRF)

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N

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).

References

NVD MITRE CVE.org CISA KEV

Published

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Community ground truth

Community verdict

2 verdicts
Not a real issue

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Community real-world severity: High (High 2) — CVSS base score 5.3

Practitioners rate this higher than its CVSS — treat with extra caution.

Field notes & remediation

Verdicts are the quick signal — notes are the evidence and fixes behind them.

  • 0
    Field note · Diego RamírezCurated

    VMware vCenter Server and Cloud Foundation Server Side Request Forgery (SSRF) Vulnerability — 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. Listed in the CISA KEV catalog (added 2022-03-07) — confirmed exploited in the wild, not theoretical. FIRST EPSS puts the chance of exploitation in the next 30 days at ~88%. Treat it as real and prioritize remediation over triage.

  • 0
    Remediation · Marco FerriCurated

    Required action for VMware vCenter Server and Cloud Foundation: Apply updates per vendor instructions. CISA set a federal remediation due date of 2022-03-21. After patching, verify the vulnerable path is no longer reachable before closing the finding.

Related CVEs

Same weakness — CWE-918 · Server-Side Request Forgery (SSRF).