CVE-2020-24655
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 · uneditedA race condition in the Twilio Authy 2-Factor Authentication application before 24.3.7 for Android allows a user to potentially approve/deny an access request prior to unlocking the application with a PIN on older Android devices (effectively bypassing the PIN requirement).
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 race condition in Authy Android versions before 24.3.7 allows approval or denial of authentication requests to occur before the PIN lock is verified on older Android devices. This enables an attacker with physical access to bypass the PIN protection mechanism by quickly responding to an authentication request before the device lock screen fully engages.
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= 24.3.7CVSS 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
- Local
- Complexity
- High
- Privileges
- None
- User interaction
- None
- Scope
- Unchanged
- Confidentiality
- High
- Integrity
- None
- Availability
- None
CVSS:3.1/AV:L/AC:H/PR:N/UI:N/S:U/C:H/I:N/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 checksWork through these to decide whether this CVE applies to you.
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Verify Authy for Android is installedCheck device for Authy 2 Factor Authentication app in app drawer or via Android settings > AppsAffected if Authy for Android is present on the device
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Determine installed Authy versionOpen Google Play Store, search for Authy, view app details to see version number; or go to Authy app > Settings > AboutAffected if Version is lower than 24.3.7 (e.g., 24.3.6, 24.2.0, etc.)
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Confirm PIN lock is enabled in AuthyOpen Authy app > Settings > Security > check if PIN lock or App lock is turned onAffected if PIN/App lock is enabled and the Authy version is below 24.3.7
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Identify Android OS versionGo to Android Settings > About Phone > Android versionAffected if Running an older Android version where the race condition can be exploited (the vulnerability specifically affects older Android devices, though no specific version cutoff was provided)
The environment is affected if Authy for Android is installed with a version lower than 24.3.7, PIN/App lock is enabled, and the device runs an older Android version where the PIN verification race condition can be triggered.
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.
From vendor dataUpdate Authy for Android to version 24.3.7 or later. On older Android devices, ensure the application lock is enforced before any authentication prompt can be responded to.
- Consultation1.0 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 $1,200.
Scan for this in your stack
Free · runs locallyCheck whether your project pulls in CVE-2020-24655 — 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-2020-24655 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
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