ChromeWeb browser · Google
CVE-2021-4078
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 · uneditedType confusion in V8 in Google Chrome prior to 96.0.4664.93 allowed a remote attacker to potentially exploit heap corruption via a crafted HTML page.
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 type confusion vulnerability in Chrome's V8 JavaScript engine allows a remote attacker to corrupt heap memory and potentially achieve arbitrary code execution when a user visits a specially crafted HTML page. The vulnerability affects versions prior to 96.0.4664.93.
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
ChromeWeb browser
< 96.0.4664.93
Debian LinuxOperating system
= 10.0= 11.0CVSS 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
- Network
- Complexity
- Low
- Privileges
- None
- User interaction
- Required
- Scope
- Unchanged
- Confidentiality
- High
- Integrity
- High
- Availability
- High
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/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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Check Google Chrome version on Windows/macOS/LinuxOpen Chrome and navigate to chrome://version, or run 'google-chrome --version' or 'chrome --version' from command lineAffected if The displayed version number is less than 96.0.4664.93 (e.g., 96.0.4664.45, 95.x.x.x, etc.)
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Check Chromium version on Debian systemsRun 'dpkg -l | grep chromium' or 'apt show chromium' from terminal to list installed Chromium package and versionAffected if The installed Chromium version is lower than 96.0.4664.93
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Verify if browser is used in the environmentDetermine if Google Chrome or Chromium is installed by checking common installation paths or using system inventory toolsAffected if Chrome or Chromium is installed and its version falls below 96.0.4664.93
A user is affected if Google Chrome or Chromium browser installed in their environment has a version number lower than 96.0.4664.93, as this is the specific version range where the V8 type confusion vulnerability exists.
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 · scoped96.0.4664.93
Update Google Chrome to version 96.0.4664.93 or later. Deploy the update organization-wide via patch management or group policy, and verify compliance.
Chrome version 96.0.4664.93 or later (or the latest stable Chrome release)
- For Google Chrome users: Navigate to Chrome menu > Help > About Google Chrome and verify version is 96.0.4664.93 or later. If an earlier version is shown, Chrome will automatically check for updates and prompt to restart.
- Alternatively, download and install the latest stable Chrome from the official Google Chrome download page (google.com/chrome) to ensure version 96.0.4664.93 or newer is installed.
- For Debian Linux users: Run 'sudo apt-get update && sudo apt-get upgrade' to apply security updates, or specifically search for chromium package updates in Debian repositories to address this vulnerability.
Generated from the published advisory — verify against the referenced sources before acting.
Fix this in Chrome
Scoped from the published advisory
- Consultation2.0 h
- Implementation4.0 h
- Testing2.0 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 $2,560.
Scan for this in your stack
Free · runs locallyCheck whether your project pulls in CVE-2021-4078 — 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-2021-4078 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