How severe is CVE-2021-21528?

CVE-2021-21528 has a CVSS 3.x base score of 7.5, rated high severity. It is exploitable over network with low attack complexity, requires no privileges and no user interaction. Impact on confidentiality is high, integrity none, and availability none.

Is CVE-2021-21528 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 1% (57th percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2021-21528?

CVE-2021-21528 primarily affects Dell Emc Powerscale Onefs. In total, 3 product configurations (CPEs) are listed as vulnerable; see the affected-products list for the exact versions.

How do I fix CVE-2021-21528?

Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Given its high severity, prioritise patching exposed systems.

When was CVE-2021-21528 published?

CVE-2021-21528 was published on 2021-11-12 and last updated on 2026-06-17.

CVE-2021-21528

CVE-2021-21528 is a high-severity vulnerability in Dell Emc Powerscale Onefs with a CVSS 3.x base score of 7.5. 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-548.

Key facts

Severity: High (CVSS 3.x base score 7.5)
CVSS v2: 5.0
EPSS exploit prediction: 1% (57th percentile)
Actively exploited: Not listed in CISA KEV
Weakness: CWE-548
Affected product: Dell Emc Powerscale Onefs
Published: 2021-11-12
Last modified: 2026-06-17

Description

Dell EMC PowerScale OneFS versions 9.1.0, 9.2.0.x, 9.2.1.x contain an Exposure of Information through Directory Listing vulnerability. This vulnerability is triggered when upgrading from a previous versions.

Frequently asked questions

What is CVE-2021-21528?: Dell EMC PowerScale OneFS versions 9.1.0, 9.2.0.x, 9.2.1.x contain an Exposure of Information through Directory Listing vulnerability. This vulnerability is triggered when upgrading from a previous versions.
How severe is CVE-2021-21528?: CVE-2021-21528 has a CVSS 3.x base score of 7.5, rated high severity. It is exploitable over network with low attack complexity, requires no privileges and no user interaction. Impact on confidentiality is high, integrity none, and availability none.
Is CVE-2021-21528 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 1% (57th percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2021-21528?: CVE-2021-21528 primarily affects Dell Emc Powerscale Onefs. In total, 3 product configurations (CPEs) are listed as vulnerable; see the affected-products list for the exact versions.
How do I fix CVE-2021-21528?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Given its high severity, prioritise patching exposed systems.
When was CVE-2021-21528 published?: CVE-2021-21528 was published on 2021-11-12 and last updated on 2026-06-17.

References

https://www.dell.com/support/kbdoc/en-us/000193005/

Affected products (3)

cpe:2.3:o:dell:emc_powerscale_onefs:9.1.0.0:*:*:*:*:*:*:*
cpe:2.3:o:dell:emc_powerscale_onefs:9.2.0.0:*:*:*:*:*:*:*
cpe:2.3:o:dell:emc_powerscale_onefs:9.2.1.0:*:*:*:*:*:*:*

More vulnerabilities in Dell Emc Powerscale Onefs

CVE-2021-21502 — Critical (CVSS 9.8): Dell PowerScale OneFS versions 8.1.0 – 9.1.0 contain a "use of SSH key past account expiration" vulnerability. A user…
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CVE-2021-21506 — High (CVSS 8.8): PowerScale OneFS 8.1.2,8.2.2 and 9.1.0 contains an improper input sanitization issue in its API handler. An…
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CVE-2023-22575 — High (CVSS 8.7): Dell PowerScale OneFS 9.0.0.x - 9.4.0.x contain an insertion of sensitive information into log file vulnerability in…

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