CVE-2021-31001
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 · uneditedAn access issue was addressed with improved access restrictions. This issue is fixed in iOS 15 and iPadOS 15. An attacker in a privileged network position may be able to leak sensitive user information.
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 · moderate confidenceThis is an access control vulnerability in iOS and iPadOS versions prior to 15. An attacker positioned on the same network (e.g., via man-in-the-middle) can exploit improper access restrictions to leak sensitive user information. The fix implements improved access restrictions to prevent unauthorized information disclosure.
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< 15.0< 15.0CVSS 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
- Low
- User interaction
- None
- Scope
- Unchanged
- Confidentiality
- High
- Integrity
- None
- Availability
- None
CVSS:3.1/AV:N/AC:L/PR:L/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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Check iOS version on the deviceGo to Settings > General > About on the iOS/iPadOS device and note the version number displayed next to 'Version'Affected if The version shown is less than 15.0 (for example, 14.7.1, 14.6, etc.)
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Verify iPadOS version if using an iPadGo to Settings > General > About on the iPad and confirm the version numberAffected if The version shown is less than 15.0
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Confirm the build numberIn Settings > General > About, note the 'Build Number' and compare it to known iOS 15.0 build numbers for your device modelAffected if The build number corresponds to an iOS version below 15.0
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Check for pending software updatesGo to Settings > General > Software Update to see if an update to iOS 15.0 or later is available but not yet installedAffected if An update to version 15.0 or later is available and has not been installed
You are affected if your iOS or iPadOS device is running any version below 15.0, as the improper access restrictions exist in those versions and can be exploited by an attacker on your network.
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 · scoped15.0
Update all iOS and iPadOS devices to version 15 or later to apply the patched access restrictions.
iOS 15 and iPadOS 15 or later
- Back up your iPhone or iPad using iCloud or your computer to preserve data
- On your device, go to Settings > General
- Tap Software Update
- Download and install the iOS 15 or iPadOS 15 update (or a later version)
- Ensure the device is connected to Wi-Fi and plugged into power during the update process
Generated from the published advisory — verify against the referenced sources before acting.
- 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-2021-31001 — 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-2021-31001 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