Security readout for executives and security teams
Plain-English summary
This affects Dell PowerScale OneFS storage systems running versions 8.1.0 through 9.1.0. Under specific conditions, a CompAdmin user can gain higher privileges and break out of Compliance mode, which may undermine protected data governance controls. Dell describes this as critical and recommends upgrading at the earliest opportunity.
Executive priority
Prioritize remediation for PowerScale systems that protect regulated or retention-controlled data. The main business risk is loss of confidence in Compliance mode controls, not broad internet-scale exploitation based on the provided evidence.
Technical view
CVE-2021-21553 is an Incorrect User Management issue, mapped to CWE-286, in Dell PowerScale OneFS. The CVSS 3.1 vector is AV:L/AC:L/PR:L/UI:R/S:U/C:H/I:H/A:H, indicating local access, low privileges, and user interaction, with high confidentiality, integrity, and availability impact.
Likely exposure
Exposure is limited to Dell PowerScale OneFS versions 8.1.0 through 9.1.0, especially environments using Compliance mode and CompAdmin workflows. The source bundle does not identify other affected Dell products or cloud services.
Exploitation context
The source bundle does not show CISA KEV listing or public active exploitation evidence. Exploitation requires local access, low privileges, and user interaction per CVSS, but the specific triggering conditions are not described in the provided sources.
Researcher notes
Public details are limited. The key research focus is authorization state around CompAdmin and Compliance mode enforcement. Do not infer remote exploitability, affected versions beyond 8.1.0-9.1.0, or confirmed exploitation from the provided sources.
Mitigation direction
- Inventory Dell PowerScale OneFS versions across all clusters.
- Upgrade affected OneFS systems according to Dell advisory guidance.
- Restrict CompAdmin access to trusted operational staff only.
- Monitor CompAdmin activity until remediation is complete.
- Confirm Compliance mode controls remain enforced after upgrade.
- Check Dell guidance for any environment-specific mitigations.
Validation and detection
- Identify any OneFS clusters running versions 8.1.0 through 9.1.0.
- Confirm upgrade status against Dell KB 000188148.
- Review CompAdmin account assignments and recent usage.
- Audit Compliance mode status on affected clusters.
- Review logs for unusual privilege or compliance-mode changes.
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-286: 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-2021-21553 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
- High
- CVSS
- 7.3 (3.1)
- Known Exploited
- No
- Published
Vector: CVSS:3.1/AV:L/AC:L/PR:L/UI:R/S:U/C:H/I:H/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:L/AC:L/PR:L/UI:R/S:U/C:H/I:H/A:H1.35.9Primary CVE scoreVulnerability scoring details
Base CVSS 3.1 score
7.3HighVector: CVSS:3.1/AV:L/AC:L/PR:L/UI:R/S:U/C:H/I:H/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.
Incorrect User Management
Incorrect User Management represents a recurring weakness pattern that can create exploitable paths when design, validation, or implementation controls are missing.