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ChromeWeb browser · Google

CVE-2021-21210

MEDIUM · 6.5 CVSS v3.1 Published 2021-04-26
Fix available
A fix is available. Upgrade to 90.0.4430.72 or later.
See remediation →
72/100
Remediation priority · Elevated
Remotely reachable No privileges

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 · unedited
Inappropriate implementation in Network in Google Chrome prior to 90.0.4430.72 allowed a remote attacker to potentially access local UDP ports 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 confidence

An inappropriate implementation in the Network component of Google Chrome prior to version 90.0.4430.72 allowed a remote attacker serving a crafted HTML page to potentially access local UDP ports on the victim's machine, bypassing intended browser sandbox restrictions.

MitigationUpdate Google Chrome to version 90.0.4430.72 or later to patch this vulnerability.

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
Affected:< 90.0.4430.72
Debian LinuxOperating system
Affected:= 10.0
FedoraOperating system
Affected:= 32= 33= 34

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
Required
Scope
Unchanged
Confidentiality
None
Integrity
High
Availability
None

CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/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 checks

Work through these to decide whether this CVE applies to you.

  1. Check installed Google Chrome version
    Open Chrome, go to Menu > Help > About Google Chrome, or navigate to chrome://settings/help
    Affected if Version number is lower than 90.0.4430.72
  2. Check Chrome version on Linux via command line
    Run 'google-chrome --version' or 'google-chrome-stable --version' in terminal
    Affected if Version output is lower than 90.0.4430.72
  3. Check Chromium browser version on Linux
    Run 'chromium --version' or 'chromium-browser --version' in terminal
    Affected if Chromium version is lower than 90.0.4430.72 (the fix was applied to Chromium as well)
  4. Verify Debian system version
    Check /etc/debian_version or run 'cat /etc/os-release'
    Affected if System is Debian 10.x and a Chrome version below 90.0.4430.72 is installed
  5. Verify Fedora system version
    Run 'cat /etc/fedora-release' or 'cat /etc/os-release'
    Affected if System is Fedora 32, 33, or 34 and a Chrome version below 90.0.4430.72 is installed

You are affected if Google Chrome or Chromium browser version is less than 90.0.4430.72, regardless of operating system, with Debian 10 and Fedora 32/33/34 being specifically noted as affected Linux distributions.

Generated from the published advisory. Verify against your own configuration.

Check your environment

Paste your version and any relevant configuration and it will be compared against the affected criteria above. Do not include secrets or credentials.

AI-assisted, checked against the advisory. Informational, not a guarantee.

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.

From vendor data
Upgrade available Upgrade to 90.0.4430.72 or later
Fixed in 90.0.4430.72
Interim mitigation

Update Google Chrome to version 90.0.4430.72 or later to patch this vulnerability.

Fix this in Chrome Scoped from the published advisory
  • Consultation1.0 h
  • Implementation1.0 h
  • Testing1.0 h
  • Review / QA1.0 h
4.0 hours of engineering $750
Get the upgrade done

An estimate, not a bill — we confirm scope with you before any work starts. Need it this week? Rush from $1,200.

Scan for this in your stack

Free · runs locally
dbcve dependency scanner

Check whether your project pulls in CVE-2021-21210 — or any other known-vulnerable package — straight from your lock files. Free and open source; it runs locally and uploads nothing.

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References Go to the primary sourcePrimary sources — vendor advisories, patches and trackers. Where our summary and a reference disagree, the reference wins.

Primary sources

Practitioner notes

Contributed

Peer-ranked notes from engineers who’ve handled CVE-2021-21210 in production — separate from our analysis above.

No notes yet

Be the first to add a field note for this CVE — a mitigation you’ve verified, a version caveat, or a link to a working fix. Sign in above to contribute.

What this is

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.

What belongs here
  • 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