Analyst readout for executives and security teams
Plain-English summary
Affected IBM Spectrum Scale hosts can be locally disrupted by a non-root user overwhelming the mmfsd daemon. The issue is denial of service: sources do not indicate data theft or data modification, but file-service availability could be impacted.
Executive priority
Prioritize remediation where Spectrum Scale supports critical workloads or shared storage. This is not described as remote code execution, but local denial of service against storage infrastructure can create business disruption.
Technical view
CVE-2020-4925 affects IBM Spectrum Scale 5.0 and 5.1. A non-root user can overflow mmfsd with requests, preventing the daemon from servicing other requests. CVSS 3.0 score is 6.2, with local attack vector and high availability impact.
Likely exposure
Exposure is most likely in environments running IBM Spectrum Scale 5.0 or 5.1 where non-root local users can access cluster nodes. The source bundle indicates local exploitation, not remote network exploitation.
Exploitation context
The bundle does not show CISA KEV listing or cited evidence of active exploitation. IBM X-Force tracks the issue as ID 191599. Treat as a local availability risk until vendor guidance is confirmed.
Researcher notes
Evidence is limited to the CVE description, CVSS vector, IBM advisory reference, and IBM X-Force reference. No CWE, specific fixed version, or exploit narrative is provided in the bundle.
Mitigation direction
- Identify all IBM Spectrum Scale 5.0 and 5.1 deployments.
- Review IBM advisory 6560094 for official fixes or upgrade paths.
- Apply IBM-supported updates for affected Spectrum Scale branches.
- Limit unnecessary local user access to Spectrum Scale nodes.
- Monitor mmfsd health and availability during remediation.
Validation and detection
- Confirm Spectrum Scale versions on all cluster nodes.
- Check whether affected nodes run version 5.0 or 5.1.
- Verify IBM-recommended fixes are installed after patching.
- Review logs and monitoring for mmfsd availability disruptions.
- Document local user access paths to cluster nodes.
Public sources used
Based on public source material and reviewed before publication.
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.
CVE-2020-4925 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
- 6.2 (3.0)
- Known Exploited
- No
- Published
Vector: CVSS:3.0/I:N/C:N/PR:N/AC:L/S:U/A:H/AV:L/UI:N/RC:C/RL:O/E: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:3.0/I:N/C:N/PR:N/AC:L/S:U/A:H/AV:L/UI:N/RC:C/RL:O/E:H2.53.6Primary CVE scoreVulnerability scoring details
Base CVSS 3.0 score
6.2MediumVector: CVSS:3.0/I:N/C:N/PR:N/AC:L/S:U/A:H/AV:L/UI:N/RC:C/RL:O/E:H
Source materials
- CVE List V5 sourceCVE List V5
- https://www.ibm.com/support/pages/node/6560094CVE reference · x_refsource_CONFIRM
- ibm-spectrum-cve20204925-dos (191599)CVE reference · vdb-entry, x_refsource_XF
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.