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CVE Record

CVE-2021-30922: Multiple out-of-bounds write issues were addressed with improved bounds checking.

Multiple out-of-bounds write issues were addressed with improved bounds checking. This issue is fixed in macOS Big Sur 11.6.1. A malicious application may be able to execute arbitrary code with kernel privileges.

UnknownCVSS not scoredNot KEV-listedUpdated
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Glexia's TakeAutomated analysishigh

Security readout for executives and security teams

Plain-English summary

CVE-2021-30922 is an Apple macOS kernel issue where a malicious app could gain kernel privileges. That could turn an app-level compromise into deep system control. Apple says multiple out-of-bounds write issues were fixed with improved bounds checking in macOS Big Sur 11.6.1.

Executive priority

Treat this as high priority for macOS fleet hygiene because the impact is kernel-level code execution. No active exploitation is evidenced in the supplied sources, but unpatched endpoints increase risk if users run malicious apps.

Technical view

Apple describes multiple out-of-bounds write flaws addressed through improved bounds checking. The documented impact is arbitrary code execution with kernel privileges by a malicious application. The bundle identifies macOS as affected but does not provide CVSS, CWE, exact component details, or complete affected version ranges.

Likely exposure

Organizations with macOS endpoints running versions older than the relevant Apple security updates may be exposed. The bundle specifically names macOS Big Sur 11.6.1 as fixing the issue but does not define all vulnerable versions.

Exploitation context

The provided bundle does not show CISA KEV listing or cited evidence of active exploitation. The attack scenario requires a malicious application, so exposure depends on endpoint compromise, software installation controls, and patch status.

Researcher notes

Evidence is limited to Apple and CVE records. The bundle lacks component name, CVSS, CWE, proof-of-concept status, exploit maturity, and full affected-version mapping. Validate scope against Apple advisory pages before making vulnerability management decisions.

Mitigation direction

  • Update macOS systems according to Apple security guidance.
  • Prioritize macOS Big Sur systems below 11.6.1 for review.
  • Restrict untrusted application installation on managed endpoints.
  • Use endpoint controls to detect suspicious privileged process behavior.
  • Check Apple advisories for any additional affected releases.

Validation and detection

  • Inventory macOS versions across managed endpoints.
  • Confirm Big Sur systems are on 11.6.1 or later.
  • Review Apple advisory coverage for Monterey and Catalina updates.
  • Check EDR telemetry for suspicious app-to-kernel escalation indicators.
  • Verify software installation controls are enforced for users.
Prepared
Confidence
medium
Sources
5

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

Use these exact CWE pages and searches to review the Glexia ATT&CK library from this CVE's weakness and description context.

description · low confidence lookup

Execution behavior lookup

The CVE wording references code or command execution, so execution technique review may help defensive triage. This is a Glexia inferred lookup path, not an official MITRE, ATT&CK, or CVE Program mapping.

Open ATT&CK lookup
cve · low confidence lookup

CVE-2021-30922 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
Unknown
CVSS
Not scored
Known Exploited
No
Published
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.

0CVSS vectors
0Timeline events
0ADP providers
4Source links

CVSS and timeline data

No CVSS vectors or timeline events were available in the normalized CVE source material.

Source materials

Affected products

Products and packages named in the record

VendorProductVersion / packageStatus
ApplemacOSunspecifiedListed
Weakness

CWE details

No CWE listed

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