CVE-2023-40399
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 · uneditedThe issue was addressed with improved memory handling. This issue is fixed in tvOS 17, iOS 17 and iPadOS 17, watchOS 10, macOS Sonoma 14. An app may be able to disclose kernel memory.
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 confidenceA kernel memory disclosure vulnerability in Apple's operating systems (iOS 17, iPadOS 17, tvOS 17, watchOS 10, macOS Sonoma 14) allows a malicious application to potentially read kernel memory due to improper memory handling. The issue was addressed with improved memory management controls.
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< 17.0< 17.0< 14.0< 17.0< 10.0CVSS 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
- None
- Availability
- None
CVSS:3.1/AV:L/AC:L/PR:N/UI:R/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 iOS or iPadOS version on iPhone or iPadGo to Settings > General > About on the device and look at the 'Version' field, or use the command 'sw_vers' via SSH or terminal if availableAffected if The version displayed is below 17.0 (for example, 16.x or earlier)
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Check macOS version on Mac computersClick the Apple menu > About This Mac, or run 'sw_vers' in TerminalAffected if The macOS version shown is below 14.0 (such as 13.x Ventura or earlier)
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Check tvOS version on Apple TVGo to Settings > General > About > Version on the Apple TV interface, or check via Xcode or MobileDevice framework if managing remotelyAffected if The tvOS version is below 17.0
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Check watchOS version on Apple WatchOpen the Watch app on paired iPhone, go to General > About, or check directly on the watch via Settings > General > AboutAffected if The watchOS version is below 10.0
If any Apple device runs an OS version lower than the fixed releases (iOS 17+, iPadOS 17+, tvOS 17+, watchOS 10+, macOS 14+), the device is affected by this kernel memory disclosure vulnerability.
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 · scoped10.014.017.0
Apply the vendor-supplied OS updates (iOS 17+, iPadOS 17+, tvOS 17+, watchOS 10+, macOS Sonoma 14+) to all affected devices to remediate the kernel memory disclosure vulnerability.
iOS 17, iPadOS 17, tvOS 17, watchOS 10, macOS Sonoma 14
- Upgrade iPhone or iPod to iOS 17 or later
- Upgrade iPad to iPadOS 17 or later
- Upgrade Apple TV to tvOS 17 or later
- Upgrade Apple Watch to watchOS 10 or later
- Upgrade Mac to macOS Sonoma (14) or later
Generated from the published advisory — verify against the referenced sources before acting.
- Consultation2.0 h
- Implementation8.0 h
- Testing4.0 h
- Review / QA2.0 h
An estimate, not a bill — we confirm scope with you before any work starts. Need it this week? Rush from $4,480.
Scan for this in your stack
Free · runs locallyCheck whether your project pulls in CVE-2023-40399 — 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-2023-40399 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