Security readout for executives and security teams
Plain-English summary
Dell EMC PowerScale OneFS 8.1.2 through 9.1.0.x has an auditing-component flaw that can let a low-privileged authenticated user cause a denial-of-service event. The issue affects availability, not data confidentiality or integrity according to the CVSS vector.
Executive priority
Treat as a practical availability risk for affected storage platforms. It is not marked as actively exploited in the provided sources, but storage disruption can be business-impacting, so remediation should follow normal infrastructure patch prioritization.
Technical view
The CVE describes CWE-754: improper handling of unusual or exceptional conditions in the OneFS auditing component. CVSS 3.1 is 6.5 with network access, low complexity, low privileges, no user interaction, and high availability impact.
Likely exposure
Exposure is limited to Dell EMC PowerScale OneFS deployments running versions 8.1.2 through 9.1.0.x. Risk is higher where many low-privileged users can authenticate to the affected environment.
Exploitation context
The provided sources do not show CISA KEV listing or active exploitation. They support that an authenticated low-privileged user could trigger denial of service, but provide no exploit maturity or public weaponization evidence.
Researcher notes
Do not infer confidentiality or integrity impact from this record. The useful validation path is version and exposure review against Dell guidance. The source bundle does not include exploit details, root-cause depth, or named fixed releases.
Mitigation direction
- Review Dell advisory 000188148 for fixed versions or vendor workarounds.
- Inventory PowerScale clusters and identify OneFS 8.1.2 through 9.1.0.x.
- Prioritize upgrade or mitigation for internet-reachable or broadly shared environments.
- Restrict low-privileged authenticated access to trusted users where feasible.
- Monitor storage availability and audit-component errors until remediated.
Validation and detection
- Confirm exact OneFS version on every PowerScale cluster.
- Check whether low-privileged users can authenticate to affected systems.
- Review Dell advisory status against deployed OneFS versions.
- Verify remediation by confirming versions no longer match the affected range.
- Review availability incidents and audit logs for unexplained denial-of-service symptoms.
Public sources used
Generated from the cited source records. This long-tail analysis has not been individually reviewed by a named human.
Conservative CVE-to-ATT&CK context
These mappings and lookup hints may be relevant to the vulnerability behavior, CWE, affected product, or exposure path. Glexia-inferred context is not an official MITRE, ATT&CK, CWE, or CVE Program mapping.
ATT&CK lookup starting points
Use these exact CWE pages and searches to review the Glexia ATT&CK library from this CVE's weakness and description context.
CWE-754: Exact CWE lookup
Use the exact CWE identifier as the starting point before reviewing related ATT&CK behavior. Open the exact CWE lookup page first, then review the ATT&CK searches from that MITRE weakness context. This is a Glexia lookup hint, not an official ATT&CK mapping.
Open ATT&CK lookupCVE-2021-21563 mapping review
Open the CVE-to-ATT&CK bridge for reviewed, inferred, or future official mappings tied to this CVE.
Open ATT&CK lookup- Severity
- Medium
- CVSS
- 6.5 (3.1)
- Known Exploited
- No
- Published
Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
CNA and ADP enrichment extracted from CVE v5
These fields come from the CVE record and ADP containers, not from Glexia's Take. They preserve time-varying source decisions such as CISA SSVC, KEV status, CVSS metrics, and provider references.
CVSS vector scores
1 official scoreWe collect every scored CVSS vector available in the official CNA and ADP containers. When more than one version is present, the table keeps the source vectors side by side instead of collapsing them into the highest score.
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H2.83.6Primary CVE scoreVulnerability scoring details
Base CVSS 3.1 score
6.5MediumVector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
Source materials
- CVE List V5 sourceCVE List V5
- https://www.dell.com/support/kbdoc/000188148CVE reference · x_refsource_MISC
Products and packages named in the record
CWE details
CWE links open Glexia weakness intelligence pages with official CWE context, developer remediation guidance, and related CVE mappings.
Improper Check for Unusual or Exceptional Conditions
Improper Check for Unusual or Exceptional Conditions represents a recurring weakness pattern that can create exploitable paths when design, validation, or implementation controls are missing.