CVE-2021-30665

Name: CVE-2021-30665
Creator: NVD / NIST
Published: 2021-09-08T15:15:13.507+00:00
License: https://creativecommons.org/publicdomain/zero/1.0/

HIGHCVSS 8.8/10Actively ExploitedEPSS 3.47%

Last modified Jun 17, 2026

CVE-2021-30665 is a high-severity vulnerability rated 8.8/10 on the CVSS scale. 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. CISA has confirmed active exploitation in the wild. EPSS estimates a 3.47% chance of exploitation in the next 30 days.

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..

Metrics

CVSS 3.1

8.8/10

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

EPSS Probability

3.47%

87.6th percentile

Probability of exploitation in the next 30 days. Learn more

Exploitation Status

This vulnerability is listed in CISA’s Known Exploited Vulnerabilities catalog, confirming active exploitation in the wild. Federal agencies must remediate by Nov 17, 2021.

Weakness Enumeration

Affected Software

Vendor	Product	Versions
Apple	Ipados	< 14.5.1
Apple	Iphone Os	< 12.5.3
Apple	Iphone Os	>= 13.0, < 14.5.1
Apple	Macos	< 11.3.1
Apple	Tvos	< 14.6
Apple	Watchos	< 7.4.1

References

https://support.apple.com/en-us/HT212335Release Notes, Vendor Advisory
https://support.apple.com/en-us/HT212336Release Notes, Vendor Advisory
https://support.apple.com/en-us/HT212339Release Notes, Vendor Advisory
https://support.apple.com/en-us/HT212341Release Notes, Vendor Advisory
https://support.apple.com/en-us/HT212532Release Notes, Vendor Advisory
https://support.apple.com/en-us/HT212335Release Notes, Vendor Advisory
https://support.apple.com/en-us/HT212336Release Notes, Vendor Advisory
https://support.apple.com/en-us/HT212339Release Notes, Vendor Advisory
https://support.apple.com/en-us/HT212341Release Notes, Vendor Advisory
https://support.apple.com/en-us/HT212532Release Notes, Vendor Advisory
https://www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2021-30665Third Party Advisory, US Government Resource

Timeline

Published: Sep 8, 2021
Last Modified: Jun 17, 2026
Status: Analyzed

Frequently Asked Questions

What is CVE-2021-30665?

How severe is CVE-2021-30665?

CVE-2021-30665 has a CVSS score of 8.8/10 (HIGH severity). The EPSS model estimates a 3.47% probability of exploitation in the next 30 days. This vulnerability is listed in CISA's Known Exploited Vulnerabilities catalog.

How do I fix CVE-2021-30665?

Check the vendor references and advisories linked above for patched versions and mitigation guidance. You can also run a Strix scan to test if your systems are affected.

Are you affected by CVE-2021-30665?

Run a free Strix scan to check your systems for this vulnerability.

Scan your code now

Source: NVD / NIST