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CVE Record

CVE-2021-2312: 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. Successful attacks of this vulnerability can result in unauthorized ability to cause a hang or frequently repeatable crash (complete DOS) of Oracle VM VirtualBox. Note: This vulnerability applies to Windows systems only. CVSS 3.1 Base Score 4.4 (Availability impacts). CVSS Vector: (CVSS:3.1/AV:L/AC:L/PR:H/UI:N/S:U/C:N/I:N/A:H).

MediumCVSS 4.4Not KEV-listedUpdated
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Glexia's TakeAutomated analysismoderate

Security readout for executives and security teams

Plain-English summary

This is a denial-of-service issue in Oracle VM VirtualBox on Windows. An attacker already holding high privileges on the system where VirtualBox runs could crash or hang VirtualBox repeatedly. It does not indicate data theft, privilege escalation, or remote compromise in the provided sources.

Executive priority

Treat this as a moderate operational resilience issue. It is not described as remotely exploitable and requires high privileges, but unpatched Windows VirtualBox hosts could be deliberately crashed by an insider or attacker who already has elevated access.

Technical view

CVE-2021-2312 affects Oracle VM VirtualBox Core before 6.1.20 on Windows only. CVSS is 4.4: local attack vector, low complexity, high privileges required, no user interaction, unchanged scope, and high availability impact only. The provided sources do not list a CWE.

Likely exposure

Exposure is mainly Windows hosts running Oracle VM VirtualBox versions before 6.1.20. Risk is lower for systems without high-privileged local users or where VirtualBox is not operationally critical. Non-Windows systems are not affected per the CVE description.

Exploitation context

The bundle does not show CISA KEV listing or any cited evidence of active exploitation. Abuse requires high-privileged logon to the infrastructure where VirtualBox executes, so this is most relevant after local administrative access already exists.

Researcher notes

Key constraints are important: Windows only, VirtualBox Core, prior to 6.1.20, availability impact only, and high privileges required. The provided record lacks CWE, detailed root cause, CPEs, and exploit evidence, so validation should focus on version inventory and host access posture.

Mitigation direction

  • Upgrade Oracle VM VirtualBox to 6.1.20 or later where applicable.
  • Check Oracle CPU April 2021 guidance for exact supported fixed releases.
  • For Gentoo-managed systems, review GLSA-202208-36 package guidance.
  • Restrict high-privileged logon access on VirtualBox host systems.
  • Prioritize remediation where VirtualBox availability supports business operations.

Validation and detection

  • Inventory Windows systems running Oracle VM VirtualBox.
  • Confirm installed VirtualBox versions are not prior to 6.1.20.
  • Verify privileged access is limited to approved administrators.
  • Check whether VirtualBox crashes or hangs are occurring on affected hosts.
  • Document non-Windows hosts as out of scope for this CVE.
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-2021-2312 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
4.4 (3.1)
Known Exploited
No
Published

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

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
4.4CVSS 3.1MediumCVSS:3.1/AV:L/AC:L/PR:H/UI:N/S:U/C:N/I:N/A:H0.83.6Primary CVE score

Vulnerability scoring details

Base CVSS 3.1 score

4.4Medium
CVSS 3.1 vector shape for CVE-2021-2312Attack VectorAttack ComplexityPrivileges RequiredUser InteractionScopeConfidentiality ImpactIntegrity ImpactAvailability Impact

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

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.