Security readout for executives and security teams
Plain-English summary
CVE-2021-30905 is an Apple out-of-bounds read issue where a maliciously crafted file could expose user information. Apple says it was fixed through improved bounds checking in several 2021 platform updates. The source bundle does not provide CVSS scoring, affected version ranges, or evidence of active exploitation.
Executive priority
Treat this as a routine but necessary Apple patching item unless vulnerable devices handle sensitive files or remain broadly unpatched. The main business risk is user information disclosure from crafted file processing, not confirmed active exploitation.
Technical view
The flaw is an out-of-bounds read triggered while processing a crafted file, resulting in possible user information disclosure. Apple fixed it in iOS/iPadOS 15.1, macOS Monterey 12.0.1, tvOS 15.1, watchOS 8.1, and Security Update 2021-007 Catalina. Affected versions are listed only as unspecified.
Likely exposure
Exposure is most likely on Apple devices that process untrusted files and are older than the listed fixed releases. The bundle lacks precise vulnerable version ranges, so inventory checks must rely on installed OS versions and Apple advisory mapping.
Exploitation context
The source bundle says exploitation requires processing a maliciously crafted file. It does not cite public exploitation, and KEV status is false. No exploit maturity, attack chain, or in-the-wild activity is supported by the provided evidence.
Researcher notes
Evidence is limited: no CVSS, CWE, affected version range, or exploit detail is included. Do not infer code execution. Research should focus on advisory correlation, file-processing exposure, and verification of fixed OS levels.
Mitigation direction
- Update Apple devices to the fixed releases or later.
- Prioritize systems that receive or process untrusted files.
- Check Apple advisories for product-specific update applicability.
- Use normal endpoint controls to reduce risky file handling.
Validation and detection
- Inventory Apple OS versions across managed devices.
- Confirm iOS and iPadOS devices are on 15.1 or later.
- Confirm macOS Monterey systems are on 12.0.1 or later.
- Confirm Catalina systems have Security Update 2021-007.
- Review unsupported or unmanaged Apple devices separately.
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.
CVE-2021-30905 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
- Unknown
- CVSS
- Not scored
- Known Exploited
- No
- Published
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 and timeline data
No CVSS vectors or timeline events were available in the normalized CVE source material.
Source materials
- CVE List V5 sourceCVE List V5
- https://support.apple.com/kb/HT212807CVE reference · x_refsource_CONFIRM
- https://support.apple.com/kb/HT212872CVE reference · x_refsource_CONFIRM
- https://support.apple.com/en-us/HT212869CVE reference · x_refsource_MISC
- https://support.apple.com/en-us/HT212871CVE reference · x_refsource_MISC
- https://support.apple.com/en-us/HT212867CVE reference · x_refsource_MISC
- https://support.apple.com/en-us/HT212874CVE reference · x_refsource_MISC
- https://support.apple.com/en-us/HT212876CVE reference · x_refsource_MISC
- https://www.zerodayinitiative.com/advisories/ZDI-21-1368/CVE reference · x_refsource_MISC
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.