How severe is CVE-2021-21588?

CVE-2021-21588 has a CVSS 3.x base score of 6.5, rated medium severity. It is exploitable over network with low attack complexity, requires no privileges and user interaction. Impact on confidentiality is none, integrity none, and availability high.

Is CVE-2021-21588 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (26th percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2021-21588?

CVE-2021-21588 affects Dell Powerflex Presentation Server. See the affected-products list for the exact vulnerable versions.

How do I fix CVE-2021-21588?

Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround.

When was CVE-2021-21588 published?

CVE-2021-21588 was published on 2021-07-12 and last updated on 2026-06-17.

CVE-2021-21588

CVE-2021-21588 is a medium-severity vulnerability in Dell Powerflex Presentation Server with a CVSS 3.x base score of 6.5. It is not currently listed as actively exploited by CISA, and its EPSS exploit-prediction score is low. The underlying weakness is classified as CWE-345.

Key facts

Severity: Medium (CVSS 3.x base score 6.5)
CVSS v2: 4.3
EPSS exploit prediction: 0% (26th percentile)
Actively exploited: Not listed in CISA KEV
Weakness: CWE-345
Affected product: Dell Powerflex Presentation Server
Published: 2021-07-12
Last modified: 2026-06-17

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.

Frequently asked questions

What is CVE-2021-21588?: 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.
How severe is CVE-2021-21588?: CVE-2021-21588 has a CVSS 3.x base score of 6.5, rated medium severity. It is exploitable over network with low attack complexity, requires no privileges and user interaction. Impact on confidentiality is none, integrity none, and availability high.
Is CVE-2021-21588 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (26th percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2021-21588?: CVE-2021-21588 affects Dell Powerflex Presentation Server. See the affected-products list for the exact vulnerable versions.
How do I fix CVE-2021-21588?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround.
When was CVE-2021-21588 published?: CVE-2021-21588 was published on 2021-07-12 and last updated on 2026-06-17.

References

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

Affected products (1)

cpe:2.3:a:dell:powerflex_presentation_server:*:*:*:*:*:*:*:*

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