ChromeWeb browser · Google
CVE-2021-21124
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 · uneditedPotential user after free in Speech Recognizer in Google Chrome on Android prior to 88.0.4324.96 allowed a remote attacker to potentially perform a sandbox escape 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 use-after-free vulnerability in the Speech Recognizer component of Google Chrome on Android allows a remote attacker to exploit via a crafted HTML page, potentially enabling sandbox escape and 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
< 88.0.4324.96< 88.0.705.50CVSS 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
- Changed
- Confidentiality
- High
- Integrity
- High
- Availability
- High
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/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 Android versionOpen Chrome on the Android device, tap the three-dot menu, go to Settings > About Chrome, and note the version number displayed.Affected if Version is below 88.0.4324.96
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Check Microsoft Edge Chromium Android versionOpen Edge on the Android device, tap the three-dot menu, go to Settings > About Microsoft Edge, and note the version number displayed.Affected if Version is below 88.0.705.50
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Verify Speech Recognizer accessibilityConfirm that the browser can access the Speech Recognition API by visiting a webpage that uses the Web Speech API, or check if any installed applications use Chrome's built-in speech recognition features.Affected if Speech Recognizer component is accessible or being used while the browser version is vulnerable
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Confirm Android platform and browser combinationIdentify that the affected Chrome/Edge instance is running on Android (not desktop), as this vulnerability specifically affects the Android platform.Affected if Running Google Chrome or Edge Chromium on Android with a vulnerable version
A user is affected if they are running Google Chrome on Android below version 88.0.4324.96 or Microsoft Edge Chromium on Android below version 88.0.705.50, and the Speech Recognizer feature is accessible or utilized.
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 · scoped88.0.705.5088.0.4324.96
Update Google Chrome on Android to version 88.0.4324.96 or later to patch the vulnerability.
Chrome 88.0.4324.96 or later; Edge Chromium 88.0.705.50 or later
- 1. Open Google Chrome on your Android device
- 2. Navigate to the menu (three dots) > Settings
- 3. Tap on 'About Chrome' or 'Chrome'
- 4. The browser will automatically check for updates
- 5. If an update is available, tap 'Update' to download and install version 88.0.4324.96 or later
- 6. Restart the browser after the update completes
- For Edge Chromium users: Open Microsoft Edge > Menu > Settings > About Microsoft Edge and update to version 88.0.705.50 or later
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
- Testing3.0 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 $2,800.
Scan for this in your stack
Free · runs locallyCheck whether your project pulls in CVE-2021-21124 — 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-2021-21124 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