CVE-2021-30843

Name: CVE-2021-30843
Creator: NVD / NIST
Published: 2021-10-19T14:15:09.463+00:00
License: https://creativecommons.org/publicdomain/zero/1.0/

HIGHCVSS 7.8/10EPSS 1.29%

Last modified Jun 17, 2026

CVE-2021-30843 is a high-severity vulnerability rated 7.8/10 on the CVSS scale. This issue was addressed with improved checks. This issue is fixed in iOS 14.8 and iPadOS 14.8, macOS Big Sur 11.6, Security Update 2021-005 Catalina, tvOS 15, iOS 15 and iPadOS 15, watchOS 8. EPSS estimates a 1.29% chance of exploitation in the next 30 days.

Description

This issue was addressed with improved checks. This issue is fixed in iOS 14.8 and iPadOS 14.8, macOS Big Sur 11.6, Security Update 2021-005 Catalina, tvOS 15, iOS 15 and iPadOS 15, watchOS 8. Processing a maliciously crafted dfont file 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

1.29%

66.5th percentile

Probability of exploitation in the next 30 days. Learn more

Affected Software

Vendor	Product	Versions
Apple	Ipados	< 14.8
Apple	Iphone Os	< 14.8
Apple	Mac Os X	>= 10.15, <= 10.15.6
Apple	Mac Os X	10.15.7
Apple	Macos	>= 11.0, < 11.6
Apple	Tvos	< 15.0
Apple	Watchos	< 8.0

References

http://seclists.org/fulldisclosure/2021/Oct/61Mailing List, Release Notes, Third Party Advisory
http://seclists.org/fulldisclosure/2021/Oct/62Mailing List, Release Notes, Third Party Advisory
http://seclists.org/fulldisclosure/2021/Oct/63Mailing List, Release Notes, Third Party Advisory
https://support.apple.com/en-us/HT212804Release Notes, Vendor Advisory
https://support.apple.com/en-us/HT212805Release Notes, Vendor Advisory
https://support.apple.com/en-us/HT212807Release Notes, Vendor Advisory
https://support.apple.com/en-us/HT212814Release Notes, Vendor Advisory
https://support.apple.com/en-us/HT212815Release Notes, Vendor Advisory
https://support.apple.com/en-us/HT212819Release Notes, Vendor Advisory
http://seclists.org/fulldisclosure/2021/Oct/61Mailing List, Release Notes, Third Party Advisory
http://seclists.org/fulldisclosure/2021/Oct/62Mailing List, Release Notes, Third Party Advisory
http://seclists.org/fulldisclosure/2021/Oct/63Mailing List, Release Notes, Third Party Advisory
https://support.apple.com/en-us/HT212804Release Notes, Vendor Advisory
https://support.apple.com/en-us/HT212805Release Notes, Vendor Advisory
https://support.apple.com/en-us/HT212807Release Notes, Vendor Advisory
https://support.apple.com/en-us/HT212814Release Notes, Vendor Advisory
https://support.apple.com/en-us/HT212815Release Notes, Vendor Advisory
https://support.apple.com/en-us/HT212819Release Notes, Vendor Advisory

Timeline

Published: Oct 19, 2021
Last Modified: Jun 17, 2026
Status: Modified

Frequently Asked Questions

What is CVE-2021-30843?

How severe is CVE-2021-30843?

CVE-2021-30843 has a CVSS score of 7.8/10 (HIGH severity). The EPSS model estimates a 1.29% probability of exploitation in the next 30 days.

How do I fix CVE-2021-30843?

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-2021-30843?

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

Scan your code now

Source: NVD / NIST