Security readout for executives and security teams
Plain-English summary
CVE-2021-21528 can expose sensitive information from Dell EMC PowerScale OneFS through unintended directory listing. The affected releases are OneFS 9.1.0, 9.2.0.x, and 9.2.1.x, and the condition is triggered during upgrade from earlier versions. The issue is high severity because exploitation is network-reachable and requires no authentication, but the provided sources do not show active exploitation.
Executive priority
Treat this as a high-priority confidentiality issue for affected Dell storage environments. It should be handled promptly where PowerScale services are reachable from untrusted networks, but current provided evidence does not justify emergency active-exploitation language.
Technical view
The CVE describes CWE-548 Exposure of Information through Directory Listing in Dell EMC PowerScale OneFS. CVSS 3.1 is 7.5 with AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N, indicating unauthenticated network exposure with high confidentiality impact and no integrity or availability impact. Source details do not describe payloads, exact paths, or a named fix.
Likely exposure
Exposure is likely limited to organizations running Dell EMC PowerScale OneFS 9.1.0, 9.2.0.x, or 9.2.1.x after upgrading from earlier versions. Risk is higher where affected services are reachable from untrusted networks.
Exploitation context
The source bundle does not report active exploitation, and KEV is false. The CVSS vector indicates a remote, low-complexity, unauthenticated condition with no user interaction, but public sources provided here do not include exploit details or observed attacks.
Researcher notes
The provided data is sparse. It identifies affected OneFS versions, trigger context, CWE-548, and CVSS vector, but not exact exposed directories, proof-of-concept details, or a specific patch version. Use Dell’s advisory as the authoritative remediation source.
Mitigation direction
- Identify all PowerScale OneFS clusters and their exact versions.
- Check whether affected clusters were upgraded from earlier OneFS releases.
- Review Dell advisory 000193005 for vendor-approved remediation.
- Prioritize remediation for internet-facing or broadly reachable clusters.
- Restrict untrusted network access while awaiting vendor remediation.
- Document compensating controls and remediation status.
Validation and detection
- Confirm whether OneFS versions match 9.1.0, 9.2.0.x, or 9.2.1.x.
- Validate upgrade history for each affected cluster.
- Review logs and configuration for unintended directory listing exposure.
- Verify vendor guidance has been applied successfully.
- Record network reachability from untrusted zones.
- Track that KEV status is not cited as active exploitation here.
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-548: 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-2021-21528 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
- 7.5 (3.1)
- Known Exploited
- No
- Published
Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N
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:N/UI:N/S:U/C:H/I:N/A:N3.93.6Primary CVE scoreVulnerability scoring details
Base CVSS 3.1 score
7.5HighVector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N
Source materials
- CVE List V5 sourceCVE List V5
- https://www.dell.com/support/kbdoc/en-us/000193005/CVE 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.
Exposure of Information Through Directory Listing
Exposure of Information Through Directory Listing represents a recurring weakness pattern that can create exploitable paths when design, validation, or implementation controls are missing.