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CVE-2021-21973

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

VMware · CWE-918 — Server-side request forgery · in CISA KEV since 2022-03-07

KEV since 2022 · listed over a yearCISA KEVActively Exploited
78

EVRS 78 of 100 Urgent

Patch This Cycle

Rank 631 of 2,960 tracked

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Why it scores 78

Evidence available: 6 of 7 signals

Listed in the CISA KEV catalog, and an EPSS probability of 0.880.

  • CISA KEVApplied
  • RansomwareDid not apply
  • Vendor exploitationDid not apply
  • EPSSApplied
  • Microsoft Exploitability IndexNot applicable
  • Pre-patch disclosureNo data
  • KEV recencyDid not apply
  • CVSSApplied

The band answers “how soon”, not “how bad”. No data for: Pre-patch disclosure. Why some signals show no data

Fix

Patch or fixed version identified

CISA required action

Fixed in

cloud foundation: update to 3.10.1.2 or later | cloud foundation: update to 4.2 or later

Affected versions

  • cloud foundation>= 3.0 < 3.10.1.2>= 4.0 < 4.2
  • vcenter server6.56.77.0

Remediation

Apply updates per vendor instructions.

Fixed versions from NVD.

Evidence

Each value with its source
MeasureValueSource
CVSS base scoreHow severe the flaw is in itself. It does not say how likely an attack is. 5.3 NVD
FIRST EPSSFIRST's estimate of the chance this is exploited in the next 30 days, and how that ranks against all CVEs. 0.880 (99.77th pctl) FIRST EPSS
Actively exploitedWhether a source of record has confirmed attacks using it in the wild. Confirmed CISA KEV
Ransomware campaign useWhether CISA has seen ransomware operators use it. Unknown or none CISA KEV
CISA remediation deadlineThe date US federal agencies must have fixed or mitigated it. 2022-03-21 · KEV since 2022 · listed over a year CISA KEV
Public exploit moduleA module existing is not the same as active exploitation. None known Metasploit
EUVD cross-referenceENISA's record: CVSS 5.3 (v3.1), assigned by vmware. Listed ENISA EUVD

Description

NVD

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).

What CISA says to do