CVE-2023-43683
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 issue was discovered in Malwarebytes 4.6.14.326 and before 5.1.5.116 (and Nebula 2020-10-21 and later). A Stack buffer out-of-bounds access exists because of an integer underflow when handling newline characters.
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 stack-based buffer out-of-bounds access vulnerability exists in Malwarebytes versions 4.6.14.326 and before 5.1.5.116 (and Nebula 2020-10-21 and later). The issue stems from an integer underflow when the software processes newline characters, allowing an attacker to potentially write beyond buffer boundaries on the stack. This could lead to code execution or denial of service.
Verify against the referenced sources before acting — the references below are authoritative for this CVE, this summary is not.
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
- Low
- Integrity
- None
- Availability
- Low
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:L
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 Malwarebytes installationCheck if Malwarebytes is installed on the system by looking for its executable or service through system inventory tools or the installed programs listAffected if Malwarebytes is present on the system
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Identify the installed Malwarebytes versionLocate the installed version of Malwarebytes using the product's built-in version information (typically found in the UI under About/Help, or via command-line tools if available)Affected if The exact version cannot be determined or the product is found to be installed
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Compare desktop version to affected rangeCompare your installed version against the affected range: versions 4.6.14.326 and any version before 5.1.5.116 are vulnerableAffected if The installed version is 4.6.14.326 or any version below 5.1.5.116 (for the standalone/desktop product)
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Check Nebula version if applicableIf using Malwarebytes Nebula (cloud-managed endpoint protection), identify the Nebula agent or console versionAffected if The Nebula version is from 2020-10-21 or later (and has not been updated to the patched release)
You are affected if Malwarebytes (standalone or Nebula) is installed and the detected version falls within 4.6.14.326 and before 5.1.5.116, or is a Nebula version from 2020-10-21 onward that has not been patched.
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 · scopedUpdate Malwarebytes to version 5.1.5.116 or later (or Nebula post-2020-10-21) to patch the integer underflow vulnerability in newline character handling.
Malwarebytes version 5.1.5.117 or later (or latest stable release)
- 1. Open the Malwarebytes application on the affected system
- 2. Navigate to the Settings or About section
- 3. Check the current version number to confirm it is 5.1.5.116 or earlier, or 4.6.14.326 or earlier
- 4. Download the latest version of Malwarebytes from the official website (www.malwarebytes.com)
- 5. Run the installer and follow the prompts to upgrade to the latest version
- 6. Restart the system if prompted
- 7. Verify the installed version is newer than 5.1.5.116
Generated from the published advisory — verify against the referenced sources before acting.
- Consultation2.0 h
- Implementation4.0 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-2023-43683 — 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-2023-43683 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
- No spam, self-promotion, credentials, or personal data