dbcve.org
IpadosOperating system · Apple

CVE-2021-30826

HIGH · 7.5 CVSS v3.1 Published 2021-10-19
Fix available
A fix is available. Upgrade to 15.0 or later.
See remediation →
84/100
Remediation priority · High
Remotely reachable No privileges Zero-click

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 logic issue was addressed with improved state management. This issue is fixed in iOS 15 and iPadOS 15. In certain situations, the baseband would fail to enable integrity and ciphering protection.

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 logic flaw in iOS/iPadOS baseband state management causes integrity verification and ciphering (encryption) protections to fail to activate in certain situations, potentially exposing cellular communications to interception or tampering.

MitigationUpdate to iOS 15 or later. No configuration workaround exists for this baseband state management logic issue; the fix requires the Apple-supplied patch.

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:< 15.0
Iphone OsOperating system
Affected:< 15.0

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
Network
Complexity
Low
Privileges
None
User interaction
None
Scope
Unchanged
Confidentiality
None
Integrity
High
Availability
None

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/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. Check iOS or iPadOS version on the device
    Go to Settings > General > About and locate the 'Version' field, or use iTunes/Finder to view the device summary
    Affected if Version number displayed is below 15.0 (for example, 14.x or earlier)
  2. Confirm device model and iOS variant
    Verify the device is an iPhone or iPad (not a Mac running macOS) by checking the device model in Settings > General > About under 'Model Name'
    Affected if Device is an iPhone or iPad running iOS/iPadOS versions below 15.0

The environment is affected if the iPhone or iPad is running any version of iOS or iPadOS prior to 15.0, since the baseband state management logic flaw exists in those versions.

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 15.0 or later
Fixed in 15.0
Interim mitigation

Update to iOS 15 or later. No configuration workaround exists for this baseband state management logic issue; the fix requires the Apple-supplied patch.

Recommended fix High confidence

iOS 15 / iPadOS 15 or later

  1. Check current iOS/iPadOS version by going to Settings > General > About
  2. Back up device data using iCloud or Finder/iTunes
  3. Connect device to power and Wi-Fi
  4. Go to Settings > General > Software Update
  5. Download and install iOS 15 or later / iPadOS 15 or later

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

Fix this in Ipados Scoped from the published advisory
  • Consultation4.0 h
  • Implementation2.0 h
  • Testing6.0 h
  • Review / QA2.0 h
14.0 hours of engineering $2,420
Get the upgrade done

An estimate, not a bill — we confirm scope with you before any work starts. Need it this week? Rush from $3,872.

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-2021-30826 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