dbcve.org
SafariWeb browser · Apple

CVE-2021-30689

MEDIUM · 6.1 CVSS v3.1 Published 2021-09-08
Fix available
A fix is available. Upgrade to 7.5 / 11.4 or later.
See remediation →
68/100
Remediation priority · Elevated
Remotely reachable No privileges

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 · unedited
A logic issue was addressed with improved state management. This issue is fixed in tvOS 14.6, iOS 14.6 and iPadOS 14.6, Safari 14.1.1, macOS Big Sur 11.4, watchOS 7.5. Processing maliciously crafted web content may lead to universal cross site scripting.

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 confidence

A logic flaw in WebKit's state management allows processing of maliciously crafted web content to bypass same-origin restrictions, leading to universal cross-site scripting (UXSS) that can inject malicious code into any domain.

MitigationApply the vendor patches for the affected Apple products (iOS 14.6+, iPadOS 14.6+, tvOS 14.6+, watchOS 7.5+, Safari 14.1.1+, macOS Big Sur 11.4+) to resolve the WebKit state management logic issue.

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
SafariWeb browser
Affected:< 14.1.1
IpadosOperating system
Affected:< 14.6
Iphone OsOperating system
Affected:< 14.6
macOSOperating system
Affected:>= 11.0, < 11.4
TvosOperating system
Affected:< 14.6
WatchosOperating system
Affected:< 7.5

CVSS 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
Low
Integrity
Low
Availability
None

CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/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 checks

Work through these to decide whether this CVE applies to you.

  1. Check Safari version on macOS
    Open Safari, go to Safari > About Safari to view the version number
    Affected if Version is earlier than 14.1.1
  2. Check macOS Big Sur version
    Click Apple menu > About This Mac to view the macOS version
    Affected if Version is 11.0 through 11.3.x (11.4 and later are fixed)
  3. Check iOS version on iPhone
    Go to Settings > General > About to view the iOS version number
    Affected if Version is earlier than 14.6
  4. Check iPadOS version on iPad
    Go to Settings > General > About to view the iPadOS version number
    Affected if Version is earlier than 14.6
  5. Check tvOS version on Apple TV
    Go to Settings > General > About to view the tvOS version
    Affected if Version is earlier than 14.6
  6. Check watchOS version on Apple Watch
    Open the Watch app on iPhone, go to General > About to view watchOS version
    Affected if Version is earlier than 7.5

You are affected if any WebKit-based Apple product (Safari, iOS, iPadOS, tvOS, or watchOS) in your environment is running a version lower than the fixed releases (Safari 14.1.1+, iOS/iPadOS/tvOS 14.6+, watchOS 7.5+, macOS 11.4+).

Generated from the published advisory. Verify against your own configuration.

Check your environment

Paste your version and any relevant configuration and it will be compared against the affected criteria above. Do not include secrets or credentials.

AI-assisted, checked against the advisory. Informational, not a guarantee.

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 · scoped
Upgrade available Upgrade to 7.5 / 11.4 / 14.1.1 or later
Fixed in 7.511.414.1.1
Interim mitigation

Apply the vendor patches for the affected Apple products (iOS 14.6+, iPadOS 14.6+, tvOS 14.6+, watchOS 7.5+, Safari 14.1.1+, macOS Big Sur 11.4+) to resolve the WebKit state management logic issue.

Recommended fix High confidence

Safari 14.1.1, iOS/iPadOS 14.6, macOS Big Sur 11.4, tvOS 14.6, watchOS 7.5

  1. Identify the affected Apple device and current OS/browser version
  2. For iPhone/iPad: Go to Settings > General > Software Update and install iOS/iPadOS 14.6 or later
  3. For Mac: Go to System Preferences > Software Update and install macOS Big Sur 11.4 or later
  4. For Apple Watch: Open the Watch app on iPhone, go to General > Software Update and install watchOS 7.5 or later
  5. For Apple TV: Go to Settings > System > Software Updates and install tvOS 14.6 or later
  6. For Safari on older macOS: Update through Mac App Store or system software update to Safari 14.1.1
Caveat Standard OS update considerations - review Apple's release notes for any app compatibility issues before updating

Generated from the published advisory — verify against the referenced sources before acting.

Fix this in Safari Scoped from the published advisory
  • Consultation2.0 h
  • Implementation1.0 h
  • Testing1.0 h
  • Review / QA1.0 h
5.0 hours of engineering $910
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References Go to the primary sourcePrimary sources — vendor advisories, patches and trackers. Where our summary and a reference disagree, the reference wins.

Primary sources

Practitioner notes

Contributed

Peer-ranked notes from engineers who’ve handled CVE-2021-30689 in production — separate from our analysis above.

No notes yet

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What this is

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.

What belongs here
  • 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