Security readout for executives and security teams
Plain-English summary
CVE-2021-2321 is a confidentiality issue in Oracle VM VirtualBox before 6.1.20. An attacker already holding high privileges where VirtualBox runs could access critical, or potentially all, data reachable by VirtualBox.
Executive priority
Treat this as a moderate patching and access-control issue. It is not described as internet-exploitable, but compromised privileged users could expose sensitive data reachable by VirtualBox.
Technical view
Oracle lists the affected component as VirtualBox Core. CVSS 3.1 is 6.0: local attack vector, low complexity, high privileges required, no user interaction, changed scope, high confidentiality impact, and no integrity or availability impact.
Likely exposure
Exposure is limited to Oracle VM VirtualBox installations before 6.1.20, especially shared virtualization hosts, developer workstations, CI systems, or lab infrastructure where privileged users or service accounts can log on.
Exploitation context
The CVE is not in CISA KEV, and the supplied sources do not report active exploitation. Exploitation requires high privileges and local access to the infrastructure where VirtualBox executes.
Researcher notes
The public sources do not provide CWE, root-cause detail, proof-of-concept status, or exploit mechanics. Validation should focus on version exposure, privilege boundaries, and data accessible through affected VirtualBox deployments.
Mitigation direction
- Upgrade Oracle VM VirtualBox to 6.1.20 or later.
- Review Oracle's April 2021 CPU guidance for applicable platform-specific fixes.
- Restrict privileged logon access to systems running VirtualBox.
- Limit sensitive data accessible from VirtualBox hosts and guests.
Validation and detection
- Inventory systems running Oracle VM VirtualBox.
- Confirm all installed versions are 6.1.20 or later.
- Identify shared hosts where privileged users can log on.
- Review whether VirtualBox can access critical data stores.
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-2021-2321 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 (3.1)
- Known Exploited
- No
- Published
Vector: CVSS:3.1/AV:L/AC:L/PR:H/UI:N/S:C/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:L/AC:L/PR:H/UI:N/S:C/C:H/I:N/A:N1.54Primary CVE scoreVulnerability scoring details
Base CVSS 3.1 score
6MediumVector: CVSS:3.1/AV:L/AC:L/PR:H/UI:N/S:C/C:H/I:N/A:N
Source materials
- CVE List V5 sourceCVE List V5
- https://www.oracle.com/security-alerts/cpuapr2021.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.