Security readout for executives and security teams
Plain-English summary
CVE-2021-21526 affects Dell PowerScale OneFS in SmartLock compliance mode. A highly privileged compadmin user may be able to run commands as root, creating serious integrity and availability risk on affected storage systems.
Executive priority
Prioritize remediation for regulated or retention-critical storage environments. This is not described as remotely exploitable, but root-level impact can undermine storage integrity, availability, and compliance controls if an admin account is abused.
Technical view
Dell describes a privilege escalation in PowerScale OneFS 8.1.0 through 9.1.0. The CVSS vector is local, low complexity, high privileges required, no user interaction, with high integrity and availability impact. The mapped weakness is CWE-78.
Likely exposure
Exposure is most likely in environments running Dell PowerScale OneFS 8.1.0 through 9.1.0 with SmartLock compliance mode enabled and compadmin accounts present.
Exploitation context
The provided sources do not show CISA KEV listing or active exploitation. The issue requires local access with high privileges, so risk centers on malicious administrators, compromised admin accounts, or insider misuse.
Researcher notes
Evidence is limited to the CVE record and Dell advisory reference in the bundle. Do not assume additional affected products, exploit availability, or specific fixed versions unless confirmed directly in Dell guidance.
Mitigation direction
- Review Dell advisory 000185202 for supported fixes or workarounds.
- Upgrade or remediate only according to Dell’s published guidance.
- Restrict compadmin access to personnel with a current operational need.
- Monitor privileged activity on affected PowerScale clusters.
- Treat compromised compadmin credentials as a root-level storage incident.
Validation and detection
- Inventory PowerScale OneFS versions across all clusters.
- Confirm whether SmartLock compliance mode is enabled.
- Identify active compadmin accounts and recent use.
- Review logs for unexpected privileged command execution or configuration changes.
- Document remediation status against Dell advisory 000185202.
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-78: Command execution behavior lookup
Command injection weaknesses can lead defenders to review execution techniques and command interpreter telemetry. 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 lookupPrivilege behavior lookup
The CVE wording references privilege impact, so privilege escalation and authorization behavior review may help. This is a Glexia inferred lookup path, not an official MITRE, ATT&CK, or CVE Program mapping.
Open ATT&CK lookupCVE-2021-21526 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 (3.1)
- Known Exploited
- No
- Published
Vector: CVSS:3.1/AV:L/AC:L/PR:H/UI:N/S:U/C:N/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:H/UI:N/S:U/C:N/I:H/A:H0.85.2Primary CVE scoreVulnerability scoring details
Base CVSS 3.1 score
6MediumVector: CVSS:3.1/AV:L/AC:L/PR:H/UI:N/S:U/C:N/I:H/A:H
Source materials
- CVE List V5 sourceCVE List V5
- https://www.dell.com/support/kbdoc/000185202CVE 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 Neutralization of Special Elements used in an OS Command ('OS Command Injection')
Improper Neutralization of Special Elements used in an OS Command ('OS Command Injection') represents a recurring weakness pattern that can create exploitable paths when design, validation, or implementation controls are missing.