What is CVE-2021-30666?

CVE-2021-30666 is a buffer-overflow vulnerability in Apple iOS WebKit.

How does CVE-2021-30666 affect Apple iOS?

CVE-2021-30666 may allow for code execution when processing maliciously crafted web content on Apple iOS.

Who is affected by CVE-2021-30666?

Users of Apple iOS versions up to and including 12.5.3 are affected by CVE-2021-30666.

How severe is CVE-2021-30666?

CVE-2021-30666 is a buffer-overflow vulnerability that can potentially lead to code execution.

How can I fix CVE-2021-30666?

To fix CVE-2021-30666, users should update their Apple iOS to version 12.5.4 or later.

Vulnerability/
CVE-2021-30666

Exploited

high

8.8

CWE

119

3/5/2021

8/9/2021

21/11/2024

CVE-2021-30666: Apple iOS Buffer Overflow Vulnerability

First published: Mon May 03 2021(Updated: )

A buffer overflow issue was addressed with improved memory handling. This issue is fixed in iOS 12.5.3. 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..

Credit: product-security@apple.com yangkang &zerokeeper&bianliang @dnpushme 360 ATA product-security@apple.com

Affected Software	Affected Version	How to fix
Apple iPhone OS	<12.5.3
Apple iOS	<12.5.3	12.5.3
Apple iOS
	<12.5.3

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Reference Links

Parent vulnerabilities

(Appears in the following advisories)

HT212341

Peer vulnerabilities

(Found alongside the following vulnerabilities)

Frequently Asked Questions

What is CVE-2021-30666?
CVE-2021-30666 is a buffer-overflow vulnerability in Apple iOS WebKit.
How does CVE-2021-30666 affect Apple iOS?
CVE-2021-30666 may allow for code execution when processing maliciously crafted web content on Apple iOS.
Who is affected by CVE-2021-30666?
Users of Apple iOS versions up to and including 12.5.3 are affected by CVE-2021-30666.
How severe is CVE-2021-30666?
CVE-2021-30666 is a buffer-overflow vulnerability that can potentially lead to code execution.
How can I fix CVE-2021-30666?
To fix CVE-2021-30666, users should update their Apple iOS to version 12.5.4 or later.

collector/nvd-index
agent/type
agent/first-publish-date
collector/apple-support
agent/software-canonical-lookup-request
agent/title
agent/severity
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collector/nvd-api
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agent/software-canonical-lookup
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collector/mitre-cve
source/MITRE
exploited/true
collector/cisa-known-exploited
source/CISA
agent/references
agent/softwarecombine
agent/tags
agent/event
collector/nvd-cve
agent/last-modified-date
agent/trending
vendor/apple
canonical/apple iphone os
canonical/apple ios

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