Security readout for executives and security teams
Plain-English summary
This issue can let an unauthenticated remote attacker crash or restart a process on affected Dell EMC OneFS systems. The described impact is availability disruption, not data theft or data modification. Business urgency is moderate, especially for storage environments where process restarts could affect service reliability.
Executive priority
Treat as a moderate availability risk for storage infrastructure. It does not indicate data compromise in the provided sources, but process restarts on storage platforms can still disrupt business operations. Validate affected versions and follow Dell guidance.
Technical view
CVE-2020-5383 is a CWE-119 buffer overflow in the Likewise component of Dell EMC Isilon OneFS 8.2.2 and Dell EMC PowerScale OneFS 9.0.0. CVSS 3.1 is 5.3: network exploitable, low complexity, no privileges, no user interaction, availability low, no confidentiality or integrity impact.
Likely exposure
Exposure is most likely where affected OneFS versions are reachable over a network by untrusted users. The bundle identifies Isilon OneFS 8.2.2 and PowerScale OneFS 9.0.0, but does not describe specific ports or deployment conditions.
Exploitation context
The source bundle does not show CISA KEV listing or cited active exploitation. It states a remote unauthenticated attacker may potentially exploit the flaw to cause a process restart. No exploit maturity, public exploit, or attack campaign evidence is provided.
Researcher notes
The evidence supports network, unauthenticated availability impact through a buffer overflow in the Likewise component. The provided bundle does not include port details, root cause specifics, proof-of-concept status, or confirmed fixed versions, so validation should remain version- and advisory-driven.
Mitigation direction
- Check Dell advisory DSA-2020-189 for vendor-approved updates or workarounds.
- Prioritize affected internet-facing or broadly reachable OneFS systems.
- Restrict network access to affected OneFS services where operationally possible.
- Monitor affected systems for unexpected process restarts or availability events.
- Plan remediation through normal storage maintenance windows if downtime risk exists.
Validation and detection
- Inventory Dell EMC Isilon and PowerScale OneFS versions.
- Identify systems running Isilon OneFS 8.2.2 or PowerScale OneFS 9.0.0.
- Confirm whether affected systems are reachable from untrusted networks.
- Review logs and monitoring for process restarts around exposed services.
- Verify remediation status against Dell DSA-2020-189 guidance.
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-119: 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-2020-5383 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
- 5.3 (3.1)
- Known Exploited
- No
- Published
Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L
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:N/I:N/A:L3.91.4Primary CVE scoreVulnerability scoring details
Base CVSS 3.1 score
5.3MediumVector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L
Source materials
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 Restriction of Operations within the Bounds of a Memory Buffer
Improper Restriction of Operations within the Bounds of a Memory Buffer represents a recurring weakness pattern that can create exploitable paths when design, validation, or implementation controls are missing.