CVE-2021-21980

Name: CVE-2021-21980
Creator: NVD / NIST
Published: 2021-11-24T17:15:07.623+00:00
License: https://creativecommons.org/publicdomain/zero/1.0/

HIGHCVSS 7.5/10EPSS 4.60%

Last modified Jun 17, 2026

CVE-2021-21980 is a high-severity vulnerability rated 7.5/10 on the CVSS scale. The vSphere Web Client (FLEX/Flash) contains an unauthorized arbitrary file read vulnerability. A malicious actor with network access to port 443 on vCenter Server may exploit this issue to gain access to sensitive information.. EPSS estimates a 4.60% chance of exploitation in the next 30 days.

Description

The vSphere Web Client (FLEX/Flash) contains an unauthorized arbitrary file read vulnerability. A malicious actor with network access to port 443 on vCenter Server may exploit this issue to gain access to sensitive information.

Metrics

CVSS 3.1

7.5/10

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

EPSS Probability

4.60%

90.5th percentile

Probability of exploitation in the next 30 days. Learn more

Affected Software

Vendor	Product	Versions
Vmware	Cloud Foundation	3.0
Vmware	Vcenter Server	6.5
Vmware	Vcenter Server	6.7

References

https://www.vmware.com/security/advisories/VMSA-2021-0027.htmlPatch, Vendor Advisory
https://www.vmware.com/security/advisories/VMSA-2021-0027.htmlPatch, Vendor Advisory

Timeline

Published: Nov 24, 2021
Last Modified: Jun 17, 2026
Status: Modified

Frequently Asked Questions

What is CVE-2021-21980?

How severe is CVE-2021-21980?

CVE-2021-21980 has a CVSS score of 7.5/10 (HIGH severity). The EPSS model estimates a 4.60% probability of exploitation in the next 30 days.

How do I fix CVE-2021-21980?

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-2021-21980?

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

Scan your code now

Source: NVD / NIST