How severe is CVE-2021-21563?

CVE-2021-21563 has a CVSS 3.x base score of 6.5, rated medium severity. It is exploitable over network with low attack complexity, requires low privileges and no user interaction. Impact on confidentiality is none, integrity none, and availability high.

Is CVE-2021-21563 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 1% (53rd percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2021-21563?

CVE-2021-21563 primarily affects Dell Emc Powerscale Onefs. In total, 5 product configurations (CPEs) are listed as vulnerable; see the affected-products list for the exact versions.

How do I fix CVE-2021-21563?

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

When was CVE-2021-21563 published?

CVE-2021-21563 was published on 2021-08-03 and last updated on 2026-06-17.

CVE-2021-21563

CVE-2021-21563 is a medium-severity vulnerability in Dell Emc Powerscale Onefs 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-754.

Key facts

Severity: Medium (CVSS 3.x base score 6.5)
CVSS v2: 4.0
EPSS exploit prediction: 1% (53rd percentile)
Actively exploited: Not listed in CISA KEV
Weakness: CWE-754
Affected product: Dell Emc Powerscale Onefs
Published: 2021-08-03
Last modified: 2026-06-17

Description

Dell EMC PowerScale OneFS versions 8.1.2-9.1.0.x contain an Improper Check for Unusual or Exceptional Conditions in its auditing component.This can lead to an authenticated user with low-privileges to trigger a denial of service event.

Frequently asked questions

What is CVE-2021-21563?: Dell EMC PowerScale OneFS versions 8.1.2-9.1.0.x contain an Improper Check for Unusual or Exceptional Conditions in its auditing component.This can lead to an authenticated user with low-privileges to trigger a denial of service event.
How severe is CVE-2021-21563?: CVE-2021-21563 has a CVSS 3.x base score of 6.5, rated medium severity. It is exploitable over network with low attack complexity, requires low privileges and no user interaction. Impact on confidentiality is none, integrity none, and availability high.
Is CVE-2021-21563 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 1% (53rd percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2021-21563?: CVE-2021-21563 primarily affects Dell Emc Powerscale Onefs. In total, 5 product configurations (CPEs) are listed as vulnerable; see the affected-products list for the exact versions.
How do I fix CVE-2021-21563?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround.
When was CVE-2021-21563 published?: CVE-2021-21563 was published on 2021-08-03 and last updated on 2026-06-17.

References

https://www.dell.com/support/kbdoc/000188148

Affected products (5)

cpe:2.3:o:dell:emc_powerscale_onefs:8.1.3:*:*:*:*:*:*:*
cpe:2.3:o:dell:emc_powerscale_onefs:8.2.1:*:*:*:*:*:*:*
cpe:2.3:o:dell:emc_powerscale_onefs:8.2.2:*:*:*:*:*:*:*
cpe:2.3:o:dell:emc_powerscale_onefs:9.0.0.0:*:*:*:*:*:*:*
cpe:2.3:o:dell:emc_powerscale_onefs:9.1.0.0:*:*:*:*:*:*:*

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…
CVE-2022-26851 — Critical (CVSS 9.1): Dell PowerScale OneFS, 8.2.2-9.3.x, contains a predictable file name from observable state vulnerability. An…
CVE-2020-5353 — High (CVSS 8.8): The Dell Isilon OneFS versions 8.2.2 and earlier and Dell EMC PowerScale OneFS version 9.0.0 default configuration for…
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…
CVE-2020-5369 — High (CVSS 8.8): Dell EMC Isilon OneFS versions 8.2.2 and earlier and Dell EMC PowerScale OneFS version 9.0.0 contain a privilege…
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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