VulnerabilityAnalyzed

CVE-2021-21973

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

KEVMEDIUM 5.3EPSS 87.6%

Does this matter?

Known to be exploited in the wild (CISA KEV, CISA remediation deadline 21 March 2022). Treat as an emergency change: patch or isolate now, then hunt for prior compromise.

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 3.1: 5.3 MEDIUMCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N
EPSS: 87.64% probability · 100th percentile
CISA KEV: Listed 7 March 2022 · due 21 March 2022
Weakness: CWE-918
Affected: vmware/cloud foundation · vmware/vcenter server
Source: security@vmware.com

CISA notes

Apply updates per vendor instructions. https://nvd.nist.gov/vuln/detail/CVE-2021-21973

References

https://www.vmware.com/security/advisories/VMSA-2021-0002.htmlVendor Advisory
https://www.vmware.com/security/advisories/VMSA-2021-0002.htmlVendor Advisory
https://www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2021-21973US Government Resource

Source: NVD record, EPSS from FIRST.org, KEV from CISA. Refreshed daily.