CVE-2021-30820
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 logic issue was addressed with improved state management. This issue is fixed in iOS 14.8 and iPadOS 14.8. A remote attacker may be able to cause arbitrary code execution.
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 confidenceCVE-2021-30820 is a logic vulnerability in iOS and iPadOS caused by improper state management. It allows a remote attacker to achieve arbitrary code execution without user interaction beyond visiting malicious content. This was patched in iOS 14.8 and iPadOS 14.8.
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< 14.8< 14.8CVSS 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
- None
- Scope
- Unchanged
- Confidentiality
- High
- Integrity
- High
- Availability
- High
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/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 the iOS version on the iPhoneGo to Settings > General > About > Version on the iPhone device and note the version number displayed (for example, 14.7.1 or 15.0)Affected if The displayed version is less than 14.8 (for example, 14.7, 14.6, 14.5, etc.)
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Check the iPadOS version on the iPadGo to Settings > General > About > Version on the iPad device and note the version number displayedAffected if The displayed version is less than 14.8 (for example, 14.7.1, 14.6, etc.)
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Compare installed version against affected rangeCompare the discovered version number to the affected range of any version lower than 14.8. Versions 14.8 and later (including 15.x and 16.x) are patched.Affected if The device is running any iOS or iPadOS version below 14.8
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Identify devices that cannot upgradeDetermine if any managed devices are on older hardware that may not support iOS 15 or later, as those may still be on vulnerable versions.Affected if Devices are stuck on iOS/iPadOS versions below 14.8 and cannot be upgraded
If any iPhone or iPad is running iOS or iPadOS version 14.7.x or lower, the device is vulnerable to remote code execution via this CVE.
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 · scoped14.8
Upgrade affected iOS/iPadOS devices to version 14.8 or later (preferably current supported versions). Deploy through MDM or over-the-air updates to ensure comprehensive coverage.
iOS 14.8 / iPadOS 14.8
- Back up your iPhone or iPad to iCloud or your computer before updating
- Go to Settings > General > Software Update on your device
- Download and install iOS 14.8 (for iPhone) or iPadOS 14.8 (for iPad)
- Restart your device after the update completes
Generated from the published advisory — verify against the referenced sources before acting.
- Consultation3.0 h
- Implementation6.0 h
- Testing3.0 h
- Review / QA2.0 h
An estimate, not a bill — we confirm scope with you before any work starts. Need it this week? Rush from $3,984.
Scan for this in your stack
Free · runs locallyCheck whether your project pulls in CVE-2021-30820 — 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-2021-30820 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