dbcve.org
IpadosOperating system · Apple

CVE-2021-30894

HIGH · 7.8 CVSS v3.1 Published 2021-08-24
Fix available
A fix is available. Upgrade to 15.1 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
A memory corruption issue was addressed with improved input validation. This issue is fixed in iOS 15.1 and iPadOS 15.1, tvOS 15.1. An application may be able to execute arbitrary code with kernel 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 · moderate confidence

A memory corruption vulnerability in iOS, iPadOS, and tvOS allows a malicious application to escalate privileges to kernel level. The issue was addressed through improved input validation, which prevents the memory corruption that could otherwise be exploited to execute arbitrary code with the highest system privileges.

MitigationApply the vendor-supplied patches by updating to iOS 15.1, iPadOS 15.1, or tvOS 15.1 or later. Organizations should inventory affected devices and deploy the OS updates through their mobile device management infrastructure.

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:< 15.1
Iphone OsOperating system
Affected:< 15.1
TvosOperating system
Affected:< 15.1

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 device type
    Determine if the device is an iPhone, iPad, or Apple TV. On iOS and iPadOS devices, go to Settings > General > About to see the model name. On tvOS, go to Settings > General > About to see the model.
    Affected if Device is an iPhone, iPad, or Apple TV running iOS, iPadOS, or tvOS respectively.
  2. Check installed iOS version on iPhone
    On iPhone, open Settings > General > About and note the version number displayed next to 'Version'.
    Affected if Running iOS version lower than 15.1 on iPhone.
  3. Check installed iPadOS version on iPad
    On iPad, open Settings > General > About and note the version number displayed next to 'Version'.
    Affected if Running iPadOS version lower than 15.1 on iPad.
  4. Check installed tvOS version on Apple TV
    On Apple TV, go to Settings > General > About and note the version number displayed next to 'Version'.
    Affected if Running tvOS version lower than 15.1 on Apple TV.
  5. Compare version against affected range
    Compare the version number you found (e.g., 15.0.2, 14.7.1) to 15.1. Any version below 15.1 (such as 15.0.x, 14.x, or earlier) is within the affected range.
    Affected if Installed version is less than 15.1.

You are affected if the device runs iOS, iPadOS, or tvOS version 15.0 or earlier; devices running 15.1 or later are not affected by this vulnerability.

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 15.1 or later
Fixed in 15.1
Interim mitigation

Apply the vendor-supplied patches by updating to iOS 15.1, iPadOS 15.1, or tvOS 15.1 or later. Organizations should inventory affected devices and deploy the OS updates through their mobile device management infrastructure.

Recommended fix High confidence

iOS 15.1, iPadOS 15.1, or tvOS 15.1 (or later)

  1. For iPhone/iPad: Open Settings > General > Software Update, then download and install iOS/iPadOS 15.1 or later
  2. For Apple TV: Go to Settings > System > Software Updates, then select Update Software to install tvOS 15.1 or later
  3. After updating, verify the update was successful by checking Settings > General > About for the iOS/iPadOS version, or Settings > System > About for tvOS

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

Fix this in Ipados Scoped from the published advisory
  • Consultation2.0 h
  • Implementation4.0 h
  • Testing2.0 h
  • Review / QA2.0 h
10.0 hours of engineering $1,780
Get the upgrade done

An estimate, not a bill — we confirm scope with you before any work starts. Need it this week? Rush from $2,848.

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-2021-30894 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