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Ipad OsOperating system · Apple

CVE-2021-30907

HIGH · 7.8 CVSS v3.1 Published 2021-08-24
Fix available
A fix is available. Upgrade to 8.1 / 10.15.7 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
An integer overflow was addressed through improved input validation. This issue is fixed in iOS 15.1 and iPadOS 15.1, macOS Monterey 12.0.1, iOS 14.8.1 and iPadOS 14.8.1, tvOS 15.1, watchOS 8.1, Security Update 2021-007 Catalina, macOS Big Sur 11.6.1. A malicious application may be able to elevate privileges.

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

Integer overflow vulnerability in Apple operating systems (iOS, iPadOS, macOS, tvOS, watchOS) that allows a malicious application to elevate privileges due to insufficient input validation. The vulnerability was addressed through improved input validation bounds checking.

MitigationApply the appropriate security update for the affected Apple operating system version: iOS 15.1+, iPadOS 15.1+, macOS Monterey 12.0.1+, macOS Big Sur 11.6.1+, Security Update 2021-007 for Catalina, iOS 14.8.1+, iPadOS 14.8.1+, tvOS 15.1+, or watchOS 8.1+.

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
Ipad OsOperating system
Affected:< 14.8.1
IpadosOperating system
Affected:= 15.0
Iphone OsOperating system
Affected:< 14.8.1= 15.0
Mac Os XOperating system
Affected:< 10.15.7= 10.15.7
macOSOperating system
Affected:>= 11.0, < 11.6.1= 12.0
TvosOperating system
Affected:< 15.1
WatchosOperating system
Affected:< 8.1

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. Identify your Apple operating system
    Determine if the device runs iOS, iPadOS, macOS, tvOS, or watchOS. On iOS/iPadOS: Settings > General > About. On macOS: Apple menu > About This Mac. On tvOS: Settings > General > About. On watchOS: Open the Watch app on paired iPhone > General > About.
    Affected if The device runs any of the listed Apple operating systems.
  2. Check iOS or iPadOS version
    On iOS/iPadOS device, go to Settings > General > About and note the version number. Compare to affected versions: < 14.8.1 or = 15.0.
    Affected if iOS or iPadOS version is lower than 14.8.1 or equals 15.0.
  3. Check macOS version
    On Mac, click Apple menu > About This Mac to view the macOS version. Compare to affected versions: macOS Catalina (10.15.7 or lower), macOS Big Sur 11.0 to 11.6.0, or macOS 12.0.
    Affected if macOS is version 10.15.7 or lower, between 11.0 and 11.6.0, or equals 12.0.
  4. Check tvOS version
    On Apple TV, go to Settings > General > About and note the tvOS version. Compare to affected versions: < 15.1.
    Affected if tvOS version is lower than 15.1.
  5. Check watchOS version
    Open the Watch app on paired iPhone, go to General > About to view watchOS version. Compare to affected versions: < 8.1.
    Affected if watchOS version is lower than 8.1.

If the installed Apple operating system version falls within any of the listed affected ranges (iOS/iPadOS < 14.8.1 or = 15.0, macOS 10.15.7 or lower, macOS 11.0-11.6.0 or 12.0, tvOS < 15.1, or watchOS < 8.1), the environment is vulnerable to CVE-2021-30907.

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 8.1 / 10.15.7 / 11.6.1 or later
Fixed in 8.110.15.711.6.1
Interim mitigation

Apply the appropriate security update for the affected Apple operating system version: iOS 15.1+, iPadOS 15.1+, macOS Monterey 12.0.1+, macOS Big Sur 11.6.1+, Security Update 2021-007 for Catalina, iOS 14.8.1+, iPadOS 14.8.1+, tvOS 15.1+, or watchOS 8.1+.

Recommended fix High confidence

iOS 14.8.1 or iOS 15.1; iPadOS 14.8.1 or iPadOS 15.1; macOS Big Sur 11.6.1, macOS Monterey 12.0.1, or Security Update 2021-007 Catalina (10.15.7); tvOS 15.1; watchOS 8.1

  1. 1. Back up your device data using iCloud or Finder/iTunes before updating
  2. 2. For iPhone/iPad: Go to Settings > General > Software Update and install the available update
  3. 3. For macOS: Go to System Preferences > Software Update and install the available update
  4. 4. For Apple TV: Go to Settings > System > Software Updates > Update Software
  5. 5. For Apple Watch: Open the Watch app on iPhone, go to General > Software Update
  6. 6. After updating, verify the update was successful by checking Settings > General > About (iOS) or System Preferences > About (macOS)
Caveat Review release notes for any feature changes or app compatibility issues before updating; some older apps may not be compatible with newer OS versions

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

Fix this in Ipad Os Scoped from the published advisory
  • Consultation2.0 h
  • Implementation4.0 h
  • Testing2.0 h
  • Review / QA1.0 h
9.0 hours of engineering $1,600
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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-2021-30907 in production — separate from our analysis above.

No notes yet

Be the first to add a field note for this CVE — a mitigation you’ve verified, a version caveat, or a link to a working fix. Sign in above to contribute.

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