CVE-2021-30753

Name: CVE-2021-30753
Creator: NVD / NIST
Published: 2021-09-08T14:15:09.937+00:00
License: https://creativecommons.org/publicdomain/zero/1.0/

MEDIUMCVSS 5.5/10EPSS 0.88%

Last modified Jun 17, 2026

CVE-2021-30753 is a medium-severity vulnerability rated 5.5/10 on the CVSS scale. Processing a maliciously crafted font may result in the disclosure of process memory. This issue is fixed in macOS Big Sur 11.4, tvOS 14.6, watchOS 7.5, iOS 14.6 and iPadOS 14.6. EPSS estimates a 0.88% chance of exploitation in the next 30 days.

Description

Processing a maliciously crafted font may result in the disclosure of process memory. This issue is fixed in macOS Big Sur 11.4, tvOS 14.6, watchOS 7.5, iOS 14.6 and iPadOS 14.6. An out-of-bounds read was addressed with improved input validation.

Metrics

CVSS 3.1

5.5/10

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

EPSS Probability

0.88%

54.5th percentile

Probability of exploitation in the next 30 days. Learn more

Weakness Enumeration

CWE-125

Affected Software

Vendor	Product	Versions
Apple	Ipados	< 14.6
Apple	Iphone Os	< 14.6
Apple	Macos	>= 11.0.1, < 11.4
Apple	Tvos	< 14.6
Apple	Watchos	< 7.5

References

https://support.apple.com/en-us/HT212528Vendor Advisory
https://support.apple.com/en-us/HT212529Vendor Advisory
https://support.apple.com/en-us/HT212532Vendor Advisory
https://support.apple.com/en-us/HT212533Vendor Advisory
https://support.apple.com/en-us/HT212528Vendor Advisory
https://support.apple.com/en-us/HT212529Vendor Advisory
https://support.apple.com/en-us/HT212532Vendor Advisory
https://support.apple.com/en-us/HT212533Vendor Advisory

Timeline

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

Frequently Asked Questions

What is CVE-2021-30753?

How severe is CVE-2021-30753?

CVE-2021-30753 has a CVSS score of 5.5/10 (MEDIUM severity). The EPSS model estimates a 0.88% probability of exploitation in the next 30 days.

How do I fix CVE-2021-30753?

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-2021-30753?

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

Scan your code now

Source: NVD / NIST