Security readout for executives and security teams
Plain-English summary
CVE-2026-21982 is a high-severity Oracle VM VirtualBox Core vulnerability. Oracle says an unauthenticated attacker on the same physical communication segment as the host hardware could take over VirtualBox. Exploitation is described as difficult, but successful compromise could affect confidentiality, integrity, and availability.
Executive priority
Treat as a high-priority virtualization risk for environments using the affected versions, especially shared networks, labs, or sensitive developer systems. Urgency is reduced compared with internet-exploitable flaws because adjacent access and high attack complexity are required.
Technical view
Oracle VM VirtualBox versions 7.1.14 and 7.2.4 are listed as affected. The flaw is categorized as CWE-284 and has CVSS 3.1 score 7.5: AV:A/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H. The attack requires adjacent access to the physical communication segment and no user interaction or privileges.
Likely exposure
Exposure is most relevant where affected VirtualBox versions run on systems connected to networks or hardware segments accessible by untrusted or semi-trusted users. Internet-only remote exposure is not indicated by the provided CVSS vector.
Exploitation context
The source bundle does not indicate active exploitation, and CISA KEV status is false. Oracle describes exploitation as difficult, but unauthenticated adjacent attackers could potentially achieve full VirtualBox takeover if conditions are met.
Researcher notes
Public technical detail is limited in the provided sources. The key signals are Oracle’s affected versions, Core component, CWE-284 classification, adjacent attack vector, high complexity, and full CIA impact. No exploit details or confirmed exploitation are provided.
Mitigation direction
- Identify Oracle VM VirtualBox 7.1.14 and 7.2.4 installations.
- Review Oracle's January 2026 Critical Patch Update guidance for VirtualBox.
- Apply vendor-recommended updates or mitigations when available.
- Restrict untrusted access to the same physical communication segment.
- Prioritize hosts running sensitive workloads or shared lab environments.
Validation and detection
- Inventory VirtualBox versions across endpoints, labs, and virtualization hosts.
- Confirm whether hosts run affected versions 7.1.14 or 7.2.4.
- Assess who can access adjacent physical communication segments.
- Check Oracle advisory for applicable update status.
- Document compensating controls where immediate update is not possible.
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-284: Authorization and privilege behavior lookup
Authorization weaknesses can support privilege escalation and valid-account review, depending on exploit path. 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-2026-21982 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
- High
- CVSS
- 7.5 (3.1)
- Known Exploited
- No
- Published
Vector: CVSS:3.1/AV:A/AC:H/PR:N/UI:N/S:U/C:H/I:H/A: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:3.1/AV:A/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H1.65.9Primary CVE scoreVulnerability scoring details
Base CVSS 3.1 score
7.5HighVector: CVSS:3.1/AV:A/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H
Source materials
- CVE List V5 sourceCVE List V5
- Oracle AdvisoryCVE reference · vendor-advisory
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 Access Control
Improper Access Control represents a recurring weakness pattern that can create exploitable paths when design, validation, or implementation controls are missing.