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CVE Record

CVE-2021-2266: Vulnerability in the Oracle VM VirtualBox product of Oracle Virtualization (component: Core).

Vulnerability in the Oracle VM VirtualBox product of Oracle Virtualization (component: Core). The supported version that is affected is Prior to 6.1.20. Easily exploitable vulnerability allows high privileged attacker with logon to the infrastructure where Oracle VM VirtualBox executes to compromise Oracle VM VirtualBox. While the vulnerability is in Oracle VM VirtualBox, attacks may significantly impact additional products. Successful attacks of this vulnerability can result in unauthorized access to critical data or complete access to all Oracle VM VirtualBox accessible data. CVSS 3.1 Base Score 6.0 (Confidentiality impacts). CVSS Vector: (CVSS:3.1/AV:L/AC:L/PR:H/UI:N/S:C/C:H/I:N/A:N).

MediumCVSS 6Not KEV-listedUpdated
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Glexia's TakeAutomated analysismoderate

Security readout for executives and security teams

Plain-English summary

CVE-2021-2266 is an Oracle VM VirtualBox Core vulnerability affecting supported versions before 6.1.20. An attacker already holding high privileges on the VirtualBox host infrastructure could compromise VirtualBox confidentiality and access critical or all VirtualBox-accessible data. This is not described as remotely exploitable.

Executive priority

Treat as a scheduled but meaningful remediation item. Prioritize hosts that run sensitive virtual machines or allow multiple administrators. It is less urgent than a remote unauthenticated issue, but confidentiality impact can be serious where privileged access is broadly shared.

Technical view

Oracle rates this CVSS 3.1 6.0 with local attack vector, low complexity, high privileges required, no user interaction, changed scope, and high confidentiality impact. Integrity and availability impacts are not listed. The affected component is VirtualBox Core in versions prior to 6.1.20.

Likely exposure

Exposure is mainly on systems running Oracle VM VirtualBox before 6.1.20, especially shared administration workstations, build hosts, lab servers, or virtualization hosts with sensitive guest or host-accessible data.

Exploitation context

The source describes easy exploitation by a high-privileged attacker with logon to infrastructure where VirtualBox executes. The bundle does not cite CISA KEV listing or active exploitation evidence. Public exploit status is therefore not established from the provided sources.

Researcher notes

No CWE is provided in the bundle. Scope is changed, suggesting compromise may affect resources beyond the vulnerable component, but the source does not describe mechanics. Avoid assuming guest escape, host escape, or public exploit availability without additional evidence.

Mitigation direction

  • Upgrade Oracle VM VirtualBox to 6.1.20 or later where applicable.
  • Review Oracle April 2021 CPU guidance for product-specific remediation details.
  • Apply relevant Gentoo security updates if using Gentoo-packaged VirtualBox.
  • Restrict high-privilege logon access to VirtualBox host infrastructure.
  • Reduce sensitive data accessible from VirtualBox hosts and guests where practical.

Validation and detection

  • Inventory systems running Oracle VM VirtualBox.
  • Confirm VirtualBox versions are not prior to 6.1.20.
  • Identify hosts where high-privileged users can log on locally.
  • Review whether VirtualBox can access critical data stores.
  • Check patch status against Oracle and Gentoo advisories.
Prepared
Confidence
high
Sources
4

Public sources used

Generated from the cited source records. This long-tail analysis has not been individually reviewed by a named human.

Potential ATT&CK relevance

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-2021-2266 mapping review

Open the CVE-to-ATT&CK bridge for reviewed, inferred, or future official mappings tied to this CVE.

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Vulnerability profileCVE Program record
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

Official CVE source material

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.

1CVSS vectors
0Timeline events
0ADP providers
3Source links

CVSS vector scores

1 official score

We 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.

ScoreVersionSeverityVectorExploitImpactSource
6CVSS 3.1MediumCVSS:3.1/AV:L/AC:L/PR:H/UI:N/S:C/C:H/I:N/A:N1.54Primary CVE score

Vulnerability scoring details

Base CVSS 3.1 score

6Medium
CVSS 3.1 vector shape for CVE-2021-2266Attack VectorAttack ComplexityPrivileges RequiredUser InteractionScopeConfidentiality ImpactIntegrity ImpactAvailability Impact

Vector: CVSS:3.1/AV:L/AC:L/PR:H/UI:N/S:C/C:H/I:N/A:N

Attack Vector
NetworkAdjacentLocalPhysical
Attack Complexity
LowHigh
Privileges Required
NoneLowHigh
User Interaction
NoneRequired
Scope
ChangedUnchanged
Confidentiality Impact
HighLowNone
Integrity Impact
HighLowNone
Availability Impact
HighLowNone

Source materials

Affected products

Products and packages named in the record

VendorProductVersion / packageStatus
Oracle CorporationVM VirtualBoxunspecifiedListed
Weakness

CWE details

No CWE listed

CWE links open Glexia weakness intelligence pages with official CWE context, developer remediation guidance, and related CVE mappings.