CVE-2024-40821
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 · uneditedAn access issue was addressed with additional sandbox restrictions. This issue is fixed in macOS Monterey 12.7.6, macOS Sonoma 14.6, macOS Ventura 13.6.8. Third party app extensions may not receive the correct sandbox restrictions.
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 sandboxing vulnerability in macOS allowed third-party app extensions to potentially receive incorrect or insufficient sandbox restrictions, which could enable them to access resources beyond their intended permissions. Apple addressed this with additional sandbox restrictions in the specified macOS versions.
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>= 12.0, < 12.7.6>= 13.0, < 13.6.8>= 14.0, < 14.6CVSS 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
- None
CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:H/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 checksWork through these to decide whether this CVE applies to you.
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Identify the installed macOS versionRun 'sw_vers -productVersion' in Terminal or check System Settings > General > AboutAffected if The version is 12.0-12.7.5, 13.0-13.6.7, or 14.0-14.5 (any build before 12.7.6, 13.6.8, or 14.6)
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Confirm third-party app extensions are presentInspect /Library/Application Support/ and ~/Library/Application Support/ for third-party extension bundles (files ending in .appex), or check Applications folder for apps that contain extension componentsAffected if Any third-party apps with extensions are installed on an affected macOS version
A system is affected if it runs macOS Monterey 12.0-12.7.5, Ventura 13.0-13.6.7, or Sonoma 14.0-14.5 and has third-party app extensions installed.
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 · scoped12.7.613.6.814.6
Apply the macOS security updates (Monterey 12.7.6, Ventura 13.6.8, or Sonoma 14.6 and later) to all affected systems to ensure third-party extensions receive proper sandbox restrictions.
macOS 12.7.6 (Monterey), macOS 13.6.8 (Ventura), or macOS 14.6 (Sonoma) - depending on your current major version
- Back up your Mac using Time Machine or another backup method before proceeding with the upgrade
- Open System Settings (or System Preferences on older macOS versions)
- Navigate to General > Software Update
- Allow macOS to check for updates - it will detect the available security update
- For macOS Monterey (12.x) users: Upgrade to macOS 12.7.6
- For macOS Ventura (13.x) users: Upgrade to macOS 13.6.8
- For macOS Sonoma (14.x) users: Upgrade to macOS 14.6
- Restart your Mac when prompted to complete the installation
Generated from the published advisory — verify against the referenced sources before acting.
- Consultation2.0 h
- Implementation2.0 h
- Testing2.0 h
- Review / QA1.0 h
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Scan for this in your stack
Free · runs locallyCheck whether your project pulls in CVE-2024-40821 — 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-2024-40821 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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- 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
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