CVE-2024-9484
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 null-pointer-derefrence in the engine module in AVG/Avast Antivirus signature <24092400 released on 24/Sep/2024 on MacOS allows a malformed xar file to crash the application during file processing.
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 null-pointer-dereference vulnerability exists in the AVG/Avast Antivirus engine module for MacOS. When the antivirus scans a specially crafted malformed xar (eXtensible Archive Format) file, the engine attempts to dereference a null pointer, causing the application to crash. This issue affects signature versions prior to 24092400.
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< 24092400< 24092400CVSS 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
- None
- Integrity
- None
- Availability
- High
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/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 checksWork through these to decide whether this CVE applies to you.
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Verify AVG or Avast Antivirus for MacOS is installedCheck the Applications folder for 'Avast Antivirus' or 'AVG Antivirus' applications, or run: ls /Applications | grep -i 'avast\|avg'Affected if Either Avast Antivirus or AVG Antivirus for MacOS is present on the system
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Locate the signature database versionOpen the AVG or Avast Antivirus application, navigate to Menu > Settings > General, and look for 'Program version' or 'Virus definitions' information. Alternatively, right-click the application icon and select 'Show Info' or check within the app's about window.Affected if Unable to locate version information indicates manual verification needed
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Compare installed signature version to 24092400In the application interface, locate the virus definition/signature version number displayed (format appears as a date-based number like 2409xxxx). Compare this numeric value to 24092400.Affected if The displayed signature version number is less than 24092400 (e.g., 24092300, 24080000, etc.)
If AVG or Avast Antivirus for MacOS is installed with a signature version below 24092400, the environment is affected by this 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 · scoped24092400
Update AVG/Avast Antivirus for MacOS to signature version 24092400 or later (released September 24, 2024) to patch the null-pointer-dereference in the engine module that triggers when processing malformed xar files.
Antivirus with signature version >= 24092400 (released 24/Sep/2024)
- Open AVG or Avast Antivirus application on macOS
- Navigate to the application settings or 'About' section to check the current signature/definition version
- Locate the 'Update' or 'Check for Updates' option in the application menu
- Run the update to obtain the latest virus definitions (signature version 24092400 or later released on 24/Sep/2024)
- Verify the signature version has been updated to 24092400 or higher after the update completes
Generated from the published advisory — verify against the referenced sources before acting.
- Consultation1.0 h
- Implementation1.0 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-2024-9484 — 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-2024-9484 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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