CVE-2021-21993

Name: CVE-2021-21993
Creator: NVD / NIST
Published: 2021-09-23T12:15:07.6+00:00
License: https://creativecommons.org/publicdomain/zero/1.0/

MEDIUMCVSS 6.5/10EPSS 0.91%

Last modified Jun 17, 2026

CVE-2021-21993 is a medium-severity vulnerability rated 6.5/10 on the CVSS scale. The vCenter Server contains an SSRF (Server Side Request Forgery) vulnerability due to improper validation of URLs in vCenter Server Content Library. An authorised user with access to content library may exploit this issue by sending a POST request to vCenter Server leading to information disclosure.. EPSS estimates a 0.91% chance of exploitation in the next 30 days.

Description

The vCenter Server contains an SSRF (Server Side Request Forgery) vulnerability due to improper validation of URLs in vCenter Server Content Library. An authorised user with access to content library may exploit this issue by sending a POST request to vCenter Server leading to information disclosure.

Metrics

CVSS 3.1

6.5/10

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

EPSS Probability

0.91%

55.3th percentile

Probability of exploitation in the next 30 days. Learn more

Weakness Enumeration

CWE-918

Affected Software

Vendor	Product	Versions
Vmware	Cloud Foundation	>= 3.0, < 5.0
Vmware	Vcenter Server	6.5
Vmware	Vcenter Server	6.7
Vmware	Vcenter Server	7.0

References

https://www.vmware.com/security/advisories/VMSA-2021-0020.htmlPatch, Vendor Advisory
https://www.vmware.com/security/advisories/VMSA-2021-0020.htmlPatch, Vendor Advisory

Timeline

Published: Sep 23, 2021
Last Modified: Jun 17, 2026
Status: Modified

Frequently Asked Questions

What is CVE-2021-21993?

How severe is CVE-2021-21993?

CVE-2021-21993 has a CVSS score of 6.5/10 (MEDIUM severity). The EPSS model estimates a 0.91% probability of exploitation in the next 30 days.

How do I fix CVE-2021-21993?

Check the vendor references and advisories linked above for patched versions and mitigation guidance. You can also run a Strix scan to test if your systems are affected.

Are you affected by CVE-2021-21993?

Run a free Strix scan to check your systems for this vulnerability.

Scan your code now

Source: NVD / NIST