Analyst readout for executives and security teams
Plain-English summary
CVE-2016-5551 affects Oracle Solaris Cluster 4.3. An unauthenticated attacker who can log on to the infrastructure where Solaris Cluster runs could, with required human interaction, gain unauthorized read access to some cluster-accessible data. Business urgency is usually limited unless Solaris Cluster protects sensitive operational data.
Executive priority
Treat as a low-priority remediation item unless Solaris Cluster 4.3 remains in use around sensitive operational data. The main risk is limited unauthorized data read, not system takeover or availability loss, based on the provided sources.
Technical view
The flaw is in Solaris Cluster's NAS device addition subcomponent. The CVSS vector is AV:L/AC:L/PR:N/UI:R/S:U/C:L/I:N/A:N: local access, low attack complexity, no privileges, user interaction required, and low confidentiality impact only. Sources identify Oracle Solaris Cluster 4.3 as affected.
Likely exposure
Exposure appears limited to environments running Oracle Solaris Cluster 4.3 where an attacker can log on to the same infrastructure. Internet-facing exposure is not indicated by the sources. Organizations without Solaris Cluster 4.3 are not shown affected in the provided evidence.
Exploitation context
The bundle does not show active exploitation, public exploit use, or CISA KEV listing. The source description says exploitation requires local infrastructure logon and human interaction by someone other than the attacker.
Researcher notes
Key constraints are local attack vector, no privileges required, user interaction required, unchanged scope, and confidentiality-only impact. The bundle names only Solaris Cluster 4.3 and does not provide detailed root cause, exploit mechanics, or definitive remediation text beyond Oracle CPU reference.
Mitigation direction
- Identify any Solaris Cluster 4.3 deployments in production or support environments.
- Review Oracle's April 2017 CPU guidance for the vendor-supported fix path.
- Restrict logon access to infrastructure where Solaris Cluster executes.
- Limit and monitor administrative workflows involving NAS device addition.
- Prioritize remediation where cluster-accessible data is sensitive.
Validation and detection
- Confirm installed Solaris Cluster versions across all hosts.
- Verify whether Oracle April 2017 CPU updates were applied.
- Review access controls for users able to log on to cluster infrastructure.
- Check logs for unusual NAS device addition activity or prompts.
- Document compensating controls if vendor patch status is unknown.
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
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CVE-2016-5551 mapping review
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Open ATT&CK lookup- Severity
- Unknown
- CVSS
- Not scored
- Known Exploited
- No
- Published
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 and timeline data
No CVSS vectors or timeline events were available in the normalized CVE source material.
Source materials
- CVE List V5 sourceCVE List V5
- http://www.oracle.com/technetwork/security-advisory/cpuapr2017-3236618.htmlCVE reference · x_refsource_CONFIRM
- 97803CVE reference · vdb-entry, x_refsource_BID
- 1038292CVE reference · vdb-entry, x_refsource_SECTRACK
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.