CVE-2021-21973
CVSS v3
5.3
MEDIUM
EPSS Score
90.3 %
exploit probability
CISA KEV
Yes
known exploited
Exploitation
—
SSVC status
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).
CISA Known Exploited Vulnerability
- Date Added
- 2022-03-07
- Patch Due Date
- 2022-03-21
- Ransomware Use
- Unknown
Technical details
- Published
- 2021-02-24
Frequently asked questions
What is CVE-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 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).
Is CVE-2021-21973 actively exploited?
Yes. CVE-2021-21973 is on the CISA Known Exploited Vulnerabilities (KEV) catalog, meaning it has been confirmed as actively exploited in the wild. CISA requires federal agencies to patch by 2022-03-21.
What is the CVSS score for CVE-2021-21973?
CVE-2021-21973 has a CVSS v3 base score of 5.3 (MEDIUM severity).
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