CVE-2021-30663

high

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.

References

https://www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2021-30663

https://www.tenable.com/cyber-exposure/2021-threat-landscape-retrospective

https://support.apple.com/en-us/HT212534

https://support.apple.com/en-us/HT212532

https://support.apple.com/en-us/HT212341

https://support.apple.com/en-us/HT212336

https://support.apple.com/en-us/HT212335

Details

Source: Mitre, NVD

Published: 2021-09-08

Updated: 2025-10-23

Known Exploited Vulnerability (KEV)

Risk Information

CVSS v2

Base Score: 6.8

Vector: CVSS2#AV:N/AC:M/Au:N/C:P/I:P/A:P

Severity: Medium

CVSS v3

Base Score: 8.8

Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H

Severity: High

EPSS

EPSS: 0.00172