CVE-2021-30888: Apple iOS and iPadOS vulnerability

CVE-2021-30888: An information leakage issue was addressed.

An information leakage issue was addressed. This issue is fixed in iOS 15.1 and iPadOS 15.1, macOS Monterey 12.0.1, iOS 14.8.1 and iPadOS 14.8.1, tvOS 15.1, watchOS 8.1. A malicious website using Content Security Policy reports may be able to leak information via redirect behavior .

UnknownCVSS not scoredNot KEV-listedUpdatedAug 3, 2024, 22:48 UTC (UTC+00:00)

Security readout for executives and security teams

CVE-2021-30888 is an Apple/WebKit information leak issue. A malicious website could use Content Security Policy reports and redirect behavior to expose information that should not be revealed. Apple lists fixes across iOS, iPadOS, macOS Monterey, tvOS, and watchOS releases. Organizations are mainly exposed through Apple devices using vulnerable WebKit-based browsing components before the listed fixed versions. Exposure may extend to embedded WebKit usage, but the provided bundle only gives specific Apple fixed releases and an Openwall WebKitGTK/WPE advisory reference without detailed affected versions. Prioritize routine but timely patch compliance, especially for managed Apple fleets exposed to web browsing. The issue is remotely triggerable by malicious web content, but the supplied sources do not show active exploitation or critical severity indicators. Mitigation focus: Update iOS and iPadOS devices to 15.1, 14.8.1, or later supported releases.; Update macOS Monterey systems to 12.0.1 or later supported releases.; Update tvOS devices to 15.1 or later supported releases..

Prepared: Jun 2, 2026, 18:39 UTC (UTC+00:00)

Generated from the cited source records. This long-tail analysis has not been individually reviewed by a named human.

Potential ATT&CK relevance

Conservative CVE-to-ATT&CK context

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CVE-2021-30888 mapping review

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Vulnerability profileCVE Program record

Severity: Unknown
CVSS: Not scored
Known Exploited: No
Published: Aug 24, 2021, 18:49 UTC (UTC+00:00)

Official CVE source material

CNA and ADP enrichment extracted from CVE v5

These fields come from the CVE record and ADP containers, not from Glexia's Take. They preserve time-varying source decisions such as CISA SSVC, KEV status, CVSS metrics, and provider references.

0CVSS vectors

0Timeline events

0ADP providers

6Source links

CVSS and timeline data

No CVSS vectors or timeline events were available in the normalized CVE source material.

Source materials

CVE List V5 sourceCVE List V5
https://support.apple.com/en-us/HT212869CVE reference · x_refsource_MISC
https://support.apple.com/en-us/HT212867CVE reference · x_refsource_MISC
https://support.apple.com/en-us/HT212868CVE reference · x_refsource_MISC
https://support.apple.com/en-us/HT212874CVE reference · x_refsource_MISC
https://support.apple.com/en-us/HT212876CVE reference · x_refsource_MISC

Affected products

Products and packages named in the record

VendorProductVersion / packageStatus

AppleiOS and iPadOSunspecifiedListed

ApplemacOSunspecifiedListed

Weakness

CWE details

No CWE listed

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