Security readout for executives and security teams
Plain-English summary
This is a Dell PowerScale OneFS privilege escalation issue. An already-authenticated user with SSH or console login privileges could abuse OS command handling to gain higher privileges. It is not described as remote unauthenticated compromise, but it matters for storage systems where privileged misuse can affect operations.
Executive priority
Treat as moderate priority. It is not an unauthenticated internet-scale issue, but affected storage infrastructure deserves timely remediation because successful abuse can alter system integrity or disrupt availability.
Technical view
CVE-2021-21527 is CWE-78 command injection in Dell PowerScale OneFS 8.1.0 through 9.1.0. CVSS 3.1 is 6.0: local attack vector, low complexity, high privileges required, no user interaction, with high integrity and availability impact and no stated confidentiality impact.
Likely exposure
Exposure is limited to Dell PowerScale OneFS systems in the cited 8.1.0-9.1.0 range where users hold ISI_PRIV_LOGIN_SSH or ISI_PRIV_LOGIN_CONSOLE privileges. Internet-facing exposure is not indicated by the provided sources.
Exploitation context
The provided sources do not state active exploitation, and the CVE is not marked KEV. Abuse requires authenticated local access with specific high-privilege SSH or console login rights, so the main concern is insider misuse or compromise of privileged accounts.
Researcher notes
Available evidence is concise: affected OneFS 8.1.0-9.1.0, CWE-78, local vector, PR:H, integrity and availability impacts. The bundle does not include Dell’s detailed remediation text, exploit details, or proof of exploitation.
Mitigation direction
- Review Dell advisory 000185978 for vendor remediation and fixed OneFS versions.
- Inventory PowerScale clusters running OneFS 8.1.0 through 9.1.0.
- Restrict ISI_PRIV_LOGIN_SSH and ISI_PRIV_LOGIN_CONSOLE privileges to essential administrators.
- Harden privileged account authentication and monitor administrative access.
- Prioritize vendor-supported remediation for affected production storage clusters.
Validation and detection
- Confirm each PowerScale cluster OneFS version against the affected range.
- Review role assignments for ISI_PRIV_LOGIN_SSH and ISI_PRIV_LOGIN_CONSOLE privileges.
- Check administrative SSH and console logs for unusual privileged activity.
- Verify remediation status against Dell advisory 000185978.
- Document any compensating controls if immediate remediation is delayed.
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
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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 lookupCVE-2021-21527 mapping review
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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/000185978CVE 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.