CVE-2021-30773
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 issue in code signature validation was addressed with improved checks. This issue is fixed in iOS 14.7, tvOS 14.7, watchOS 7.6. A malicious application may be able to bypass code signing checks.
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 confidenceCVE-2021-30773 is a code signature validation bypass vulnerability in Apple's mobile operating systems (iOS, tvOS, watchOS). The vulnerability allows a malicious application to circumvent code signing checks, which are fundamental security mechanisms that verify the integrity and authenticity of executable code before execution. This could enable the execution of tampered or unauthorized code on affected devices.
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< 14.7< 14.7< 7.6CVSS 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
- Low
- Privileges
- None
- User interaction
- Required
- Scope
- Unchanged
- Confidentiality
- None
- Integrity
- High
- Availability
- None
CVSS:3.1/AV:L/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 checksWork through these to decide whether this CVE applies to you.
-
Check iOS version on iPhone or iPadOpen Settings > General > About on the device and look at the 'Version' fieldAffected if Version number is less than 14.7 (e.g., 14.6, 14.5, etc.)
-
Check tvOS version on Apple TVGo to Settings > General > About on the Apple TV and view the version number shownAffected if Version number is less than 14.7 (e.g., 14.6, 14.5, etc.)
-
Check watchOS version on Apple WatchOn the Apple Watch, go to Settings > General > About and read the 'WatchOS' version; alternatively, open the Watch app on paired iPhone, go to My Watch > General > AboutAffected if Version number is less than 7.6 (e.g., 7.5, 7.4, etc.)
A device is affected if it runs iOS, tvOS, or watchOS versions prior to 14.7, 14.7, or 7.6 respectively, as only those versions contain the fix for the code signature validation bypass.
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 · scoped7.614.7
Apply the vendor-supplied security updates: iOS 14.7 (or later), tvOS 14.7 (or later), and watchOS 7.6 (or later). In enterprise environments, deploy updates via MDM (Mobile Device Management) systems and validate application compatibility post-update.
iOS 14.7, tvOS 14.7, or watchOS 7.6 (depending on device)
- Open Settings on your iPhone, Apple TV, or Apple Watch
- Tap General, then tap Software Update
- Download and install iOS 14.7 (for iPhone), tvOS 14.7 (for Apple TV), or watchOS 7.6 (for Apple Watch)
- Restart the device after the update completes
- Verify the update was successful by checking Settings > General > About > Version
Generated from the published advisory — verify against the referenced sources before acting.
- Consultation2.0 h
- Implementation4.0 h
- Testing4.0 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 $3,328.
Scan for this in your stack
Free · runs locallyCheck whether your project pulls in CVE-2021-30773 — 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-2021-30773 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
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.
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