# CVE-2021-30665: Apple Multiple Products WebKit Memory Corruption Vulnerability

> CVE-2021-30665: Apple Multiple Products WebKit Memory Corruption Vulnerability. CVSS 8.8 (CVSS 3.1), in CISA KEV.

Canonical: https://rewindex.com/cve/CVE-2021-30665
Last updated: 2025-10-21T23:25:34Z

- Published: 2021-09-08 14:25 UTC · Updated: 2025-10-21 23:25 UTC · Assigner: apple
- CVSS: 8.8 (CVSS 3.1) · Severity: High · Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H
- EPSS: 3.7%, 90th percentile (scored 2026-10-25)
- CISA KEV: yes, added 2021-11-03, federal due date 2021-11-17, ransomware use: Unknown

## Description

A memory corruption issue was addressed with improved state management. This issue is fixed in watchOS 7.4.1, iOS 14.5.1 and iPadOS 14.5.1, tvOS 14.6, iOS 12.5.3, macOS Big Sur 11.3.1. Processing maliciously crafted web content may lead to arbitrary code execution. Apple is aware of a report that this issue may have been actively exploited..

## CISA required action

Apply updates per vendor instructions.

## Affected vendors and products

- Apple: macOS

## References

- [CVE record on cve.org](https://www.cve.org/CVERecord?id=CVE-2021-30665)
- [NVD entry](https://nvd.nist.gov/vuln/detail/CVE-2021-30665)
- [https://support.apple.com/en-us/HT212335](https://support.apple.com/en-us/HT212335)
- [https://support.apple.com/en-us/HT212336](https://support.apple.com/en-us/HT212336)
- [https://support.apple.com/en-us/HT212339](https://support.apple.com/en-us/HT212339)
- [https://support.apple.com/en-us/HT212341](https://support.apple.com/en-us/HT212341)
- [https://support.apple.com/en-us/HT212532](https://support.apple.com/en-us/HT212532)

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_Sources: CVE records from the CVE Program (cve.org). CVE® is a registered trademark of The MITRE Corporation. (https://www.cve.org/) This product uses data from the NVD API but is not endorsed or certified by the NVD. (https://nvd.nist.gov/) Known Exploited Vulnerabilities catalog from CISA. (https://www.cisa.gov/known-exploited-vulnerabilities-catalog) EPSS scores from FIRST (Exploit Prediction Scoring System). (https://www.first.org/epss/)_


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Canonical: https://rewindex.com/cve/CVE-2021-30665 · Markdown: https://rewindex.com/cve/CVE-2021-30665.md · JSON: https://rewindex.com/api/v1/cves/CVE-2021-30665 · Data licensed CC BY 4.0 (https://creativecommons.org/licenses/by/4.0/) · Generated 2026-10-26T03:12:32.721Z