Security readout for executives and security teams
Plain-English summary
CVE-2021-2381 affects the Oracle Solaris 11 kernel. A logged-in, low-privileged attacker could, with another user's interaction, alter some Solaris-accessible data or cause partial service disruption. The published severity is low, with no confidentiality impact stated.
Executive priority
Treat as routine patch management unless Solaris 11 systems are shared, internet-adjacent through login services, or operationally critical. The business impact is limited but real: data integrity changes and partial disruption are possible.
Technical view
Oracle describes a locally exploitable Solaris Kernel vulnerability affecting supported Solaris version 11. The CVSS 3.1 vector is AV:L/AC:L/PR:L/UI:R/S:U/C:N/I:L/A:L, indicating local access, low complexity, low privileges, required user interaction, and limited integrity and availability impact.
Likely exposure
Exposure is most relevant to Solaris 11 systems that allow local logon by non-administrative users, especially shared infrastructure or systems with interactive shell access.
Exploitation context
The source bundle does not show CISA KEV listing or cited evidence of active exploitation. Exploitation requires local logon and human interaction from someone other than the attacker.
Researcher notes
No CWE, root-cause detail, exploit description, or exact fixed build information is included in the provided bundle. Analysis should stay tied to Oracle's advisory and the CVSS vector until vendor details are confirmed.
Mitigation direction
- Review Oracle's July 2021 Critical Patch Update guidance for Solaris 11.
- Apply applicable Oracle Solaris security updates through approved maintenance processes.
- Restrict local logon access to users with a business need.
- Monitor Solaris systems for unexpected data changes or partial service disruption.
Validation and detection
- Inventory Solaris 11 hosts and confirm their patch status against Oracle CPU guidance.
- Identify systems where low-privileged users can log on interactively.
- Review access controls for shared Solaris infrastructure.
- Check security monitoring for integrity changes or availability issues around affected hosts.
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.
CVE-2021-2381 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
- Low
- CVSS
- 3.9 (3.1)
- Known Exploited
- No
- Published
Vector: CVSS:3.1/AV:L/AC:L/PR:L/UI:R/S:U/C:N/I:L/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:L/AC:L/PR:L/UI:R/S:U/C:N/I:L/A:L1.32.5Primary CVE scoreVulnerability scoring details
Base CVSS 3.1 score
3.9LowVector: CVSS:3.1/AV:L/AC:L/PR:L/UI:R/S:U/C:N/I:L/A:L
Source materials
- CVE List V5 sourceCVE List V5
- https://www.oracle.com/security-alerts/cpujul2021.htmlCVE 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.