CVE-2021-21588

Name: CVE-2021-21588
Creator: NVD / NIST
Published: 2021-07-12T16:15:08.593+00:00
License: https://creativecommons.org/publicdomain/zero/1.0/

MEDIUMCVSS 4.3/10EPSS 0.34%

Last modified Jun 17, 2026

CVE-2021-21588 is a medium-severity vulnerability rated 4.3/10 on the CVSS scale. Dell EMC PowerFlex, v3.5.x contain a Cross-Site WebSocket Hijacking Vulnerability in the Presentation Server/WebUI. An unauthenticated attacker could potentially exploit this vulnerability by tricking the user into performing unwanted actions on the Presentation Server and perform which may lead to configuration changes.. EPSS estimates a 0.34% chance of exploitation in the next 30 days.

Description

Dell EMC PowerFlex, v3.5.x contain a Cross-Site WebSocket Hijacking Vulnerability in the Presentation Server/WebUI. An unauthenticated attacker could potentially exploit this vulnerability by tricking the user into performing unwanted actions on the Presentation Server and perform which may lead to configuration changes.

Metrics

CVSS 3.1

4.3/10

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

EPSS Probability

0.34%

25.3th percentile

Probability of exploitation in the next 30 days. Learn more

Weakness Enumeration

Affected Software

Vendor	Product	Versions
Dell	Powerflex Presentation Server	>= 3.5, < 3.6

References

https://www.dell.com/support/kbdoc/000189265Vendor Advisory
https://www.dell.com/support/kbdoc/000189265Vendor Advisory

Timeline

Published: Jul 12, 2021
Last Modified: Jun 17, 2026
Status: Modified

Frequently Asked Questions

What is CVE-2021-21588?

How severe is CVE-2021-21588?

CVE-2021-21588 has a CVSS score of 4.3/10 (MEDIUM severity). The EPSS model estimates a 0.34% probability of exploitation in the next 30 days.

How do I fix CVE-2021-21588?

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-2021-21588?

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

Scan your code now

Source: NVD / NIST