dbcve.org
IpadosOperating system · Apple

CVE-2021-30705

MEDIUM · 5.5 CVSS v3.1 Published 2021-09-08
Fix available
A fix is available. Upgrade to 7.5 / 11.4 or later.
See remediation →
58/100
Remediation priority · Elevated
No privileges

Official description Straight from the sourceThe vendor's or NVD's own wording, published unedited. Authoritative, but often terse — it says what broke, rarely what to do.

NVD · unedited
This issue was addressed with improved checks. This issue is fixed in tvOS 14.6, Security Update 2021-004 Mojave, iOS 14.6 and iPadOS 14.6, Security Update 2021-003 Catalina, macOS Big Sur 11.4, watchOS 7.5. Processing a maliciously crafted ASTC file may disclose memory contents.

Technical summary Written by usOur analysis, written from the advisory, the CVSS vector and the affected-version data. It adds context the advisory leaves out, and never invents facts that are not in the source.

dbcve analysis · high confidence

A memory disclosure vulnerability in Apple's ASTC texture file parser allows processing of maliciously crafted ASTC files to leak adjacent memory contents. The issue stems from insufficient bounds checking during ASTC texture parsing, enabling an information disclosure attack.

MitigationApply the vendor-supplied security updates for the affected Apple operating systems (iOS 14.6+, iPadOS 14.6+, macOS Big Sur 11.4+, tvOS 14.6+, watchOS 7.5+, or the specific Security Updates 2021-003/004 for older macOS) to address the improper input validation in the ASTC parser.

Verify against the referenced sources before acting — the references below are authoritative for this CVE, this summary is not.

Affected products & versions What the vendor confirmedThe version ranges the vendor confirmed as vulnerable. If your version sits inside a range here, treat yourself as exposed until you have upgraded.

NVD · CPE data
IpadosOperating system
Affected:< 14.6
Iphone OsOperating system
Affected:< 14.6
Mac Os XOperating system
Affected:>= 10.14, <= 10.14.5>= 10.15, <= 10.15.6= 10.14.6= 10.15.7
macOSOperating system
Affected:>= 11.0, < 11.4
TvosOperating system
Affected:< 14.6
WatchosOperating system
Affected:< 7.5

CVSS breakdown How the score is builtThe industry scoring standard. It rates how the flaw is reached, what it takes to exploit, and what an attacker gains — the score is derived from those, not the other way round.

From the vector
Attack vector
Local
Complexity
Low
Privileges
None
User interaction
Required
Scope
Unchanged
Confidentiality
High
Integrity
None
Availability
None

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

Am I affected? How to checkSteps we derive from the advisory and the affected-version data, so you can decide whether this CVE reaches your setup. They are a guide, not a scan — your own configuration is the authority.

dbcve checks

Work through these to decide whether this CVE applies to you.

  1. Identify the operating system and version
    On macOS, run 'sw_vers' or check System Preferences > About. On iOS/iPadOS, go to Settings > General > About. On tvOS/watchOS, check in Settings > General > About.
    Affected if The OS version cannot be determined or is not an Apple platform
  2. Determine if macOS is affected
    If running macOS, compare the installed version (from sw_vers) against these ranges: 10.14.x where x <= 5, 10.14.6, 10.15.x where x <= 6, 10.15.7, or 11.0 to 11.3
    Affected if The macOS version falls within 10.14.0-10.14.5, 10.14.6, 10.15.0-10.15.6, 10.15.7, or 11.0-11.3
  3. Determine if iOS or iPadOS is affected
    If running iOS or iPadOS, compare the installed version (from Settings > General > About) against the affected range of versions earlier than 14.6
    Affected if The iOS or iPadOS version is earlier than 14.6 (e.g., 14.5.x, 13.x, etc.)
  4. Determine if tvOS or watchOS is affected
    If running tvOS or watchOS, compare the installed version against the affected range of versions earlier than 14.6 (tvOS) or earlier than 7.5 (watchOS)
    Affected if The tvOS version is earlier than 14.6 or the watchOS version is earlier than 7.5

The environment is affected if any Apple device runs an OS version that falls within the specified vulnerable ranges for iOS, iPadOS, macOS, tvOS, or watchOS.

Generated from the published advisory. Verify against your own configuration.

Check your environment

Paste your version and any relevant configuration and it will be compared against the affected criteria above. Do not include secrets or credentials.

AI-assisted, checked against the advisory. Informational, not a guarantee.

Remediation Closing itWhat it takes to close this. Where a vendor fix exists we point at it; where none exists we say so plainly, and can build one. Effort estimates are scoped from the advisory, not from your codebase.

dbcve · scoped
Upgrade available Upgrade to 7.5 / 11.4 / 14.6 or later
Fixed in 7.511.414.6
Interim mitigation

Apply the vendor-supplied security updates for the affected Apple operating systems (iOS 14.6+, iPadOS 14.6+, macOS Big Sur 11.4+, tvOS 14.6+, watchOS 7.5+, or the specific Security Updates 2021-003/004 for older macOS) to address the improper input validation in the ASTC parser.

Recommended fix High confidence

iOS 14.6 / iPadOS 14.6 / macOS Big Sur 11.4 / tvOS 14.6 / watchOS 7.5 / Security Update 2021-004 Mojave / Security Update 2021-003 Catalina

  1. For iOS devices: Go to Settings > General > Software Update and install iOS 14.6
  2. For iPadOS devices: Go to Settings > General > Software Update and install iPadOS 14.6
  3. For macOS Big Sur (11.x): Go to System Preferences > Software Update and install macOS Big Sur 11.4
  4. For macOS Mojave (10.14.x): Go to System Preferences > Software Update and install Security Update 2021-004 Mojave
  5. For macOS Catalina (10.15.x): Go to System Preferences > Software Update and install Security Update 2021-003 Catalina
  6. For Apple TV: Go to Settings > System > Software Updates and install tvOS 14.6
  7. For Apple Watch: Go to Settings > General > Software Update and install watchOS 7.5

Generated from the published advisory — verify against the referenced sources before acting.

Fix this in Ipados Scoped from the published advisory
  • Consultation1.0 h
  • Implementation2.0 h
  • Testing2.0 h
  • Review / QA1.0 h
6.0 hours of engineering $1,040
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Scan for this in your stack

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References Go to the primary sourcePrimary sources — vendor advisories, patches and trackers. Where our summary and a reference disagree, the reference wins.

Primary sources

Practitioner notes

Contributed

Peer-ranked notes from engineers who’ve handled CVE-2021-30705 in production — separate from our analysis above.

No notes yet

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What this is

A place for practitioners to share what actually worked: a mitigation you’ve tested, a configuration change, a version- or environment-specific caveat, or a link to a verified patch. The most useful notes rise to the top as peers upvote them, so the signal stays high.

What belongs here
  • Verified mitigations, workarounds, and config changes
  • Version or environment caveats, and links to real fixes
  • No weaponised exploit code, or anything meant to cause harm
  • No spam, self-promotion, credentials, or personal data