CVE-2021-30663

8.8 HIGH CISA KEV - Actively Exploited
Published: September 08, 2021 Modified: October 23, 2025
View on NVD

Description

An integer overflow was addressed with improved input validation. This issue is fixed in iOS 14.5.1 and iPadOS 14.5.1, tvOS 14.6, iOS 12.5.3, Safari 14.1.1, macOS Big Sur 11.3.1. Processing maliciously crafted web content may lead to arbitrary code execution.

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CVSS v3.x Details

0.0 Low Medium High Critical 10.0
Vector String
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H

References to Advisories, Solutions, and Tools

Patch Vendor Advisory Exploit Third Party Advisory
https://support.apple.com/en-us/HT212335
Source: product-security@apple.com
Release Notes Vendor Advisory
https://support.apple.com/en-us/HT212336
Source: product-security@apple.com
Release Notes Vendor Advisory
https://support.apple.com/en-us/HT212341
Source: product-security@apple.com
Release Notes Vendor Advisory
https://support.apple.com/en-us/HT212532
Source: product-security@apple.com
Release Notes Vendor Advisory
https://support.apple.com/en-us/HT212534
Source: product-security@apple.com
Release Notes Vendor Advisory
https://support.apple.com/en-us/HT212335
Source: af854a3a-2127-422b-91ae-364da2661108
Release Notes Vendor Advisory
https://support.apple.com/en-us/HT212336
Source: af854a3a-2127-422b-91ae-364da2661108
Release Notes Vendor Advisory
https://support.apple.com/en-us/HT212341
Source: af854a3a-2127-422b-91ae-364da2661108
Release Notes Vendor Advisory
https://support.apple.com/en-us/HT212532
Source: af854a3a-2127-422b-91ae-364da2661108
Release Notes Vendor Advisory
https://support.apple.com/en-us/HT212534
Source: af854a3a-2127-422b-91ae-364da2661108
Release Notes Vendor Advisory
https://www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2021-30663
Source: 134c704f-9b21-4f2e-91b3-4a467353bcc0
Third Party Advisory US Government Resource

11 reference(s) from NVD

Quick Stats

CVSS v3 Score
8.8 / 10.0
EPSS (Exploit Probability)
1.1%
78th percentile
Exploitation Status
Actively Exploited
Remediation due: 2021-11-17

Weaknesses (CWE)

CWE-190 CWE-190

Affected Vendors

apple

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