CVE-2021-30954

Name: CVE-2021-30954
Creator: NVD / NIST
Published: 2021-08-24T19:15:21.86+00:00
License: https://creativecommons.org/publicdomain/zero/1.0/

HIGHCVSS 7.8/10EPSS 1.46%

Last modified Jun 17, 2026

CVE-2021-30954 is a high-severity vulnerability rated 7.8/10 on the CVSS scale. A type confusion issue was addressed with improved memory handling. This issue is fixed in tvOS 15.2, macOS Monterey 12.1, Safari 15.2, iOS 15.2 and iPadOS 15.2, watchOS 8.3. EPSS estimates a 1.46% chance of exploitation in the next 30 days.

Description

A type confusion issue was addressed with improved memory handling. This issue is fixed in tvOS 15.2, macOS Monterey 12.1, Safari 15.2, iOS 15.2 and iPadOS 15.2, watchOS 8.3. Processing maliciously crafted web content may lead to arbitrary code execution.

Metrics

CVSS 3.1

7.8/10

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

EPSS Probability

1.46%

70.2th percentile

Probability of exploitation in the next 30 days. Learn more

Weakness Enumeration

CWE-843

Affected Software

Vendor	Product	Versions
Apple	Safari	< 15.2
Apple	Ipados	< 15.2
Apple	Iphone Os	< 15.2
Apple	Macos	>= 12.0, < 12.1
Apple	Tvos	< 15.2
Apple	Watchos	< 8.3
Fedoraproject	Fedora	34
Debian	Debian Linux	10.0
Debian	Debian Linux	11.0
Fedoraproject	Fedora	35

References

Timeline

Published: Aug 24, 2021
Last Modified: Jun 17, 2026
Status: Modified

Frequently Asked Questions

What is CVE-2021-30954?

How severe is CVE-2021-30954?

CVE-2021-30954 has a CVSS score of 7.8/10 (HIGH severity). The EPSS model estimates a 1.46% probability of exploitation in the next 30 days.

How do I fix CVE-2021-30954?

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-2021-30954?

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

Scan your code now

Source: NVD / NIST