Security readout for executives and security teams
Plain-English summary
Dell PowerScale OneFS versions 8.1.0 through 9.1.0 have a command-handling flaw that can let a highly privileged authenticated user escalate privileges. This is not a remote unauthenticated issue, but it matters where SSH or console access is broadly granted.
Executive priority
Treat as a scheduled remediation item with access-control review. Prioritize systems with many privileged users, shared admin accounts, or weak monitoring over isolated appliances with tightly controlled administrator access.
Technical view
CVE-2021-21550 is CWE-78 improper neutralization of special elements in an OS command. The CVSS 3.1 score is 6.0 with local access, low complexity, high privileges required, no user interaction, and high integrity and availability impact.
Likely exposure
Organizations running Dell EMC PowerScale OneFS 8.1.0 to 9.1.0 are potentially exposed, especially where users hold ISI_PRIV_LOGIN_SSH or ISI_PRIV_LOGIN_CONSOLE privileges.
Exploitation context
The provided sources do not indicate CISA KEV listing or active exploitation. Exploitation requires an authenticated user with specific SSH or console login privileges, limiting broad internet-driven risk but increasing insider or compromised-admin-account concern.
Researcher notes
The public bundle confirms affected version range, privilege prerequisites, CWE-78 classification, and CVSS vector. It does not provide exploit details, fixed release numbers, or evidence of exploitation, so validation should stay focused on version exposure and privileged access paths.
Mitigation direction
- Review Dell advisory KB 000185978 for fixed versions and vendor remediation guidance.
- Upgrade affected PowerScale OneFS systems according to Dell guidance.
- Limit ISI_PRIV_LOGIN_SSH and ISI_PRIV_LOGIN_CONSOLE privileges to trusted administrators.
- Review privileged account membership and remove unnecessary console or SSH access.
Validation and detection
- Inventory PowerScale OneFS versions and flag 8.1.0 through 9.1.0 systems.
- Identify users or roles with ISI_PRIV_LOGIN_SSH or ISI_PRIV_LOGIN_CONSOLE privileges.
- Confirm each affected appliance is remediated against Dell advisory KB 000185978.
- Review privileged access logs for unexpected SSH or console activity.
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 lookupCVE-2021-21550 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/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.
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.