CVE-2021-21973 KEV
5.3
MEDIUM · CVSS 3.1 · EPSS 87.6% (pctl 100)
Patch first
On CISA KEV — known exploited in the wild, due 2022-03-21.
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).
Scoring
| CVSS | 5.3 (MEDIUM, v3.1) |
|---|---|
| Vector | CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N |
| EPSS | 87.64% — more likely to be exploited than 100% of all CVEs |
| Weakness | CWE-918 |
| On CISA KEV | yes — remediate by 2022-03-21 |
| Public exploit | none known |
| Published | 2021-02-24 |
| Last modified | 2026-06-17 |
CISA KEV
| Name | VMware vCenter Server and Cloud Foundation Server Side Request Forgery (SSRF) Vulnerability |
|---|---|
| Added | 2022-03-07 |
| Due | 2022-03-21 |
| Vendor / product | VMware / vCenter Server and Cloud Foundation |
| Ransomware use | none reported |
Affected (2)
| Vendor | Product |
|---|---|
| vmware | cloud foundation |
| vmware | vcenter server |
References
→ the Explorer · watch your stack · NVD