How severe is CVE-2021-36305?

CVE-2021-36305 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-2021-36305 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 1% (52nd percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2021-36305?

CVE-2021-36305 primarily affects Dell Emc Powerscale Onefs. In total, 8 product configurations (CPEs) are listed as vulnerable; see the affected-products list for the exact versions.

How do I fix CVE-2021-36305?

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

When was CVE-2021-36305 published?

CVE-2021-36305 was published on 2021-11-12 and last updated on 2026-06-17.

CVE-2021-36305

CVE-2021-36305 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-662.

Key facts

Severity: Medium (CVSS 3.x base score 6.5)
CVSS v2: 4.0
EPSS exploit prediction: 1% (52nd percentile)
Actively exploited: Not listed in CISA KEV
Weakness: CWE-662
Affected product: Dell Emc Powerscale Onefs
Published: 2021-11-12
Last modified: 2026-06-17

Description

Dell PowerScale OneFS contains an Unsynchronized Access to Shared Data in a Multithreaded Context in SMB CA handling. An authenticated user of SMB on a cluster with CA could potentially exploit this vulnerability, leading to a denial of service over SMB.

Frequently asked questions

What is CVE-2021-36305?: Dell PowerScale OneFS contains an Unsynchronized Access to Shared Data in a Multithreaded Context in SMB CA handling. An authenticated user of SMB on a cluster with CA could potentially exploit this vulnerability, leading to a denial of service over SMB.
How severe is CVE-2021-36305?: CVE-2021-36305 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-2021-36305 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 1% (52nd percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2021-36305?: CVE-2021-36305 primarily affects Dell Emc Powerscale Onefs. In total, 8 product configurations (CPEs) are listed as vulnerable; see the affected-products list for the exact versions.
How do I fix CVE-2021-36305?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround.
When was CVE-2021-36305 published?: CVE-2021-36305 was published on 2021-11-12 and last updated on 2026-06-17.

References

https://www.dell.com/support/kbdoc/000192046

Affected products (8)

cpe:2.3:o:dell:emc_powerscale_onefs:8.2.0:*:*:*:*:*:*:*
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:*:*:*:*:*:*:*
cpe:2.3:o:dell:emc_powerscale_onefs:9.1.1.0:*:*:*:*:*:*:*
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…
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…

All CVEs affecting Dell Emc Powerscale Onefs →

Other CWE-662 vulnerabilities

CVE-2018-15555 — Critical (CVSS 9.8): On Telus Actiontec WEB6000Q v1.1.02.22 devices, an attacker can login with root level access with the user "root" and…
CVE-2024-32644 — Critical (CVSS 9.1): Evmos is a scalable, high-throughput Proof-of-Stake EVM blockchain that is fully compatible and interoperable with…
CVE-2026-53277 — High (CVSS 8.8): In the Linux kernel, the following vulnerability has been resolved: KVM: arm64: Take the SRCU lock for page table…
CVE-2022-23005 — High (CVSS 8.7): Western Digital has identified a weakness in the UFS standard that could result in a security vulnerability. This…
CVE-2016-8368 — High (CVSS 8.6): An issue was discovered in Mitsubishi Electric Automation MELSEC-Q series Ethernet interface modules QJ71E71-100, all…
CVE-2022-1931 — High (CVSS 8.1): Incorrect Synchronization in GitHub repository polonel/trudesk prior to 1.2.3.

Browse all CWE-662 vulnerabilities →