CVE-2021-30756
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 · uneditedA local attacker may be able to view Now Playing information from the lock screen. This issue is fixed in macOS Big Sur 11.4, iOS 14.6 and iPadOS 14.6. A privacy issue in Now Playing was addressed with improved permissions.
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 confidenceA local attacker with physical or lock screen access to an affected device could view Now Playing information (such as media being played) that should have been hidden. This was a permission/authorization flaw in how the lock screen displayed Now Playing data, allowing unauthorized access to media information.
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< 14.6< 14.6>= 11.0, < 11.4CVSS 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
- Low
- User interaction
- None
- Scope
- Unchanged
- Confidentiality
- High
- Integrity
- None
- Availability
- None
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/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 checksWork through these to decide whether this CVE applies to you.
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Check macOS version on Mac computersOpen Apple menu > About This Mac, or run 'sw_vers -productVersion' in TerminalAffected if Version is 11.0, 11.1, 11.2, 11.3, or 11.3.x (any version in the 11.0 to 11.3 range)
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Check iOS version on iPhonesGo to Settings > General > About, or connect to computer and view in Finder/iTunesAffected if Version is less than 14.6 (any 14.x version below 14.6, or any earlier version)
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Check iPadOS version on iPadsGo to Settings > General > About, or connect to computer and view in Finder/iTunesAffected if Version is less than 14.6 (any 14.x version below 14.6, or any earlier version)
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Verify lock screen Now Playing behavior (if still on vulnerable version)Lock the device by pressing the power button, then observe the lock screen for any media/Now Playing information displayAffected if Media information appears on the lock screen when it should be hidden (user can compare to expected behavior after updating)
A user is affected if their device runs macOS 11.0 through 11.3, or iOS/iPadOS versions earlier than 14.6, and the lock screen displays Now Playing information that should be concealed.
Generated from the published advisory. Verify against your own configuration.
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 · scoped11.414.6
Apply the vendor-supplied patches: update to macOS Big Sur 11.4 or later, iOS 14.6 or later, or iPadOS 14.6 or later.
iOS 14.6, iPadOS 14.6, macOS Big Sur 11.4
- For iOS devices: Go to Settings > General > Software Update and install iOS 14.6
- For iPadOS devices: Go to Settings > General > Software Update and install iPadOS 14.6
- For macOS devices: Open System Preferences > Software Update and install macOS Big Sur 11.4
Generated from the published advisory — verify against the referenced sources before acting.
- Consultation1.0 h
- Implementation1.0 h
- Testing1.0 h
- Review / QA1.0 h
An estimate, not a bill — we confirm scope with you before any work starts. Need it this week? Rush from $1,200.
Scan for this in your stack
Free · runs locallyCheck whether your project pulls in CVE-2021-30756 — or any other known-vulnerable package — straight from your lock files. Free and open source; it runs locally and uploads nothing.
References Go to the primary sourcePrimary sources — vendor advisories, patches and trackers. Where our summary and a reference disagree, the reference wins.
Primary sourcesPractitioner notes
ContributedPeer-ranked notes from engineers who’ve handled CVE-2021-30756 in production — separate from our analysis above.
The advisory tells you what broke. It rarely tells you what actually worked. If you’ve dealt with this one, that detail is what the next engineer is searching for.
- The version that genuinely resolved it — not the one the vendor claimed
- A config change or rule that shut the vector down
- A gotcha in the upgrade path that cost you an afternoon
No notes yet
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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.
- 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