ChromeWeb browser · Google
CVE-2021-21227
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 · uneditedInsufficient data validation in V8 in Google Chrome prior to 90.0.4430.93 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 confidenceInsufficient data validation in the V8 JavaScript engine in Google Chrome prior to version 90.0.4430.93 allows a remote attacker to exploit heap corruption via a crafted HTML page, potentially leading to arbitrary code execution.
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
< 90.0.4430.93
FedoraOperating system
= 32= 33= 34
Debian LinuxOperating system
= 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
- 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 or MacOpen Chrome and navigate to chrome://version, or click Help > About Google ChromeAffected if Displayed version is earlier than 90.0.4430.93
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Check Google Chrome version on LinuxRun 'google-chrome --version' in terminalAffected if Displayed version is earlier than 90.0.4430.93
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Check Chromium package version on FedoraRun 'dnf list installed chromium' or 'rpm -q chromium'Affected if Installed chromium version is earlier than 90.0.4430.93-1
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Check Chromium package version on DebianRun 'dpkg -l chromium' or 'apt show chromium'Affected if Installed chromium version is earlier than 90.0.4430.93-1
Your environment is affected if Google Chrome or the Chromium package version is lower than 90.0.4430.93
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 · scoped90.0.4430.93
Update Google Chrome to version 90.0.4430.93 or later. Organizations should ensure endpoints have automatic updates enabled or push the update through their patch management systems.
Chrome 90.0.4430.93 or later
- Check current Chrome version by navigating to chrome://settings/help or selecting Help > About Google Chrome
- Update Google Chrome to version 90.0.4430.93 or later by clicking 'Update Google Chrome' if available, or by downloading the latest version from google.com/chrome
- Restart the browser after the update completes to apply the fix
Generated from the published advisory — verify against the referenced sources before acting.
Fix this in Chrome
Scoped from the published advisory
- Consultation2.0 h
- Implementation1.0 h
- Testing1.0 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 $1,456.
Scan for this in your stack
Free · runs locallyCheck whether your project pulls in CVE-2021-21227 — 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-2021-21227 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