dbcve.org
ItunesApplication · Apple

CVE-2021-30847

HIGH · 7.8 CVSS v3.1 Published 2021-10-19
Fix available
A fix is available. Upgrade to 8.0 / 11.6 or later.
See remediation →
81/100
Remediation priority · High
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 watchOS 8, macOS Big Sur 11.6, Security Update 2021-005 Catalina, tvOS 15, iOS 15 and iPadOS 15, iTunes 12.12 for Windows. Processing a maliciously crafted image may lead to arbitrary code execution.

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 · moderate confidence

A memory corruption vulnerability in image processing components across multiple Apple platforms allows arbitrary code execution when processing a maliciously crafted image file. The vulnerability affects iOS, iPadOS, macOS, watchOS, tvOS, and iTunes for Windows.

MitigationApply the vendor-supplied security updates: iOS 15 and iPadOS 15, macOS Big Sur 11.6 or Security Update 2021-005 Catalina, watchOS 8, tvOS 15, or iTunes 12.12 for Windows.

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
ItunesApplication
Affected:< 12.12
IpadosOperating system
Affected:< 15.0
Iphone OsOperating system
Affected:< 15.0
Mac Os XOperating system
Affected:>= 10.15, <= 10.15.6= 10.15.7
macOSOperating system
Affected:>= 11.0, < 11.6
TvosOperating system
Affected:< 15.0
WatchosOperating system
Affected:< 8.0

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
High
Availability
High

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

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. Check iTunes for Windows version
    Open iTunes, go to Help > About iTunes. The version number is displayed in the About window.
    Affected if The version shown is earlier than 12.12
  2. Check iOS version on iPhone or iPad
    Go to Settings > General > About. Look for the 'Version' field showing the iOS version number.
    Affected if The version shown is earlier than 15.0 (for example, 14.x)
  3. Check macOS version
    Click the Apple menu > About This Mac. The version number is displayed (for example, 10.15.7 or 11.5).
    Affected if The version is 10.15, 10.15.6, or 10.15.7, OR the version is 11.0 through 11.5.x (anything less than 11.6)
  4. Check watchOS version
    Open the Watch app on paired iPhone, go to My Watch > General > About. Look for the watchOS version.
    Affected if The version shown is earlier than 8.0
  5. Check tvOS version
    Go to Settings > General > About > Version on Apple TV.
    Affected if The version shown is earlier than 15.0

You are affected if any Apple device (iPhone, iPad, Mac, Apple Watch, Apple TV) or iTunes for Windows on your network runs a version lower than the fixed releases: iOS/iPadOS 15.0, macOS 10.15.7 or 11.6, watchOS 8.0, tvOS 15.0, or iTunes 12.12.

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 8.0 / 11.6 / 12.12 or later
Fixed in 8.011.612.12
Interim mitigation

Apply the vendor-supplied security updates: iOS 15 and iPadOS 15, macOS Big Sur 11.6 or Security Update 2021-005 Catalina, watchOS 8, tvOS 15, or iTunes 12.12 for Windows.

Recommended fix High confidence

iOS 15, iPadOS 15, macOS Big Sur 11.6, Security Update 2021-005 Catalina, tvOS 15, watchOS 8, iTunes 12.12 for Windows

  1. Identify all affected Apple products installed (iTunes, iPadOS, iPhone OS, macOS, tvOS, watchOS)
  2. Check current version of each product via Settings > General > About (iOS/iPadOS) or System Preferences > Software Update (macOS)
  3. For iOS/iPadOS devices: Navigate to Settings > General > Software Update and install iOS 15 or iPadOS 15
  4. For macOS 11.x (Big Sur): Go to System Preferences > Software Update and install macOS Big Sur 11.6
  5. For macOS 10.15.x (Catalina): Install Security Update 2021-005 Catalina via System Preferences > Software Update
  6. For tvOS devices: Go to Settings > System > Software Update and install tvOS 15
  7. For watchOS devices: Open Watch app on iPhone, go to My Watch > General > Software Update and install watchOS 8
  8. For Windows iTunes: Download and install iTunes 12.12 from apple.com/itunes
Caveat Ensure device meets minimum requirements for new OS versions; backup data before upgrading; some older applications may not be compatible with new OS versions

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

Fix this in Itunes Scoped from the published advisory
  • Consultation4.0 h
  • Implementation8.0 h
  • Testing4.0 h
  • Review / QA2.0 h
18.0 hours of engineering $3,200
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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-2021-30847 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