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CVE Record

CVE-2021-30910: An out-of-bounds read was addressed with improved bounds checking.

An out-of-bounds read was addressed with improved bounds checking. This issue is fixed in iOS 15.1 and iPadOS 15.1, macOS Monterey 12.0.1, tvOS 15.1, Security Update 2021-007 Catalina, macOS Big Sur 11.6.1. Processing a maliciously crafted file may disclose user information.

UnknownCVSS not scoredNot KEV-listedUpdated
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Glexia's TakeAutomated analysismoderate

Security readout for executives and security teams

Plain-English summary

CVE-2021-30910 is an Apple information disclosure flaw. A maliciously crafted file could trigger an out-of-bounds read and expose user information. Apple fixed it with improved bounds checking across iOS, iPadOS, macOS, and tvOS update lines listed in the advisories.

Executive priority

Prioritize routine patch closure, especially for users handling external files. This is not shown as actively exploited in the supplied sources, but the exposure spans common Apple platforms and could disclose user information.

Technical view

The issue is described as an out-of-bounds read reachable when processing a crafted file. The public bundle does not name the exact component, CVSS score, CWE, or affected version ranges. Fixes are listed for iOS/iPadOS 15.1, macOS Monterey 12.0.1, Big Sur 11.6.1, Catalina Security Update 2021-007, and tvOS 15.1.

Likely exposure

Exposure is most likely on Apple devices below the fixed OS or security update levels that process untrusted files. The provided affected-version data is unspecified, so asset validation must rely on installed OS versions and Apple advisory coverage.

Exploitation context

Sources state that processing a maliciously crafted file may disclose user information. The bundle marks KEV as false, and the provided sources do not establish active exploitation. No exploit mechanics should be inferred from the available evidence.

Researcher notes

Public evidence is sparse: no CVSS, CWE, component name, or precise vulnerable version ranges are provided. Treat the Apple advisory fixed versions as the authoritative remediation boundary and avoid extrapolating beyond the crafted-file information disclosure description.

Mitigation direction

  • Update iOS and iPadOS devices to 15.1 or later supported releases.
  • Update macOS Monterey to 12.0.1 or later supported releases.
  • Update macOS Big Sur to 11.6.1 or later supported releases.
  • Apply Security Update 2021-007 on macOS Catalina where still applicable.
  • Update tvOS devices to 15.1 or later supported releases.
  • Check current Apple guidance for any newer replacement updates.

Validation and detection

  • Inventory Apple endpoints and record OS version and build.
  • Identify devices below the fixed versions named by Apple.
  • Confirm Catalina systems have Security Update 2021-007 applied.
  • Review file-handling exposure for users receiving untrusted attachments or downloads.
  • Verify vulnerability scanners map this CVE to Apple advisory-fixed versions.
Prepared
Confidence
medium
Sources
8

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-2021-30910 mapping review

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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
7Source 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
AppleiOS and iPadOSunspecifiedListed
ApplemacOSunspecifiedListed
ApplemacOSunspecifiedListed
ApplemacOSunspecifiedListed
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.