CVE-2021-21973

5.3

CVSS
Medium

PUBLISHED

The vSphere Client (HTML5) contains an SSRF (Server Side Request Forgery) vulnerability due to improper validation of URLs in a vCenter Server...

Exploited in the wild Remote Low complexity No user interaction

Vendor: VMware
Product: VMware vCenter Server, VMware Cloud Foundation
Published: Feb 24, 2021
EPSS: —

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 nuclei_scanner

CVSS scores

CVSS v3.1 5.3 Medium

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

CVSS v2.0 5.0

AV:N/AC:L/Au:N/C:P/I:N/A:N

Exploitation status

Exploited in the wild

Recorded 2022-03-07 00:00:00 UTC · Source

SSVC decision points

Exploitation: active
Automatable: Yes
Technical impact: partial

References

https://www.vmware.com/security/advisories/VMSA-2021-0002.html

Known exploited vulnerability sources

Catalogues that list this CVE as a known exploited vulnerability.

Source	Added
CISA	Mar 07, 2022

Scanner integrations

Scanner	Reference	Detected
Nuclei	https://github.com/projectdiscovery/nuclei-templates/blob/main/http/cves/2021/CVE-2021-21973.yaml	Apr 25, 2025

Vulnerability detail