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CVE-2021-30840: This issue was addressed with improved checks. This issue is fixed in tvOS 15, watchOS 8, iOS 15 and iPadOS 15. Processing a maliciously crafted dfont file may lead to arbitrary code execution.

CVE-2021-30840 · published 5 years ago

Summary

This issue was addressed with improved checks. This issue is fixed in tvOS 15, watchOS 8, iOS 15 and iPadOS 15. Processing a maliciously crafted dfont file may lead to arbitrary code execution.

What to do

Update apple ipados to version 15.0 or later.
Update apple iphone_os to version 15.0 or later.
Update apple macos to version 12.0.1 or later.
Update apple tvos to version 15.0 or later.
Update apple watchos to version 8.0 or later.

Affected software

Vendor	Product	Affected versions
apple	ipados	< 15.0 `cpe:2.3:o:apple:ipados::::::::`
apple	iphone_os	< 15.0 `cpe:2.3:o:apple:iphone_os::::::::`
apple	macos	< 12.0.1 `cpe:2.3:o:apple:macos::::::::`
apple	tvos	< 15.0 `cpe:2.3:o:apple:tvos::::::::`
apple	watchos	< 8.0 `cpe:2.3:o:apple:watchos::::::::`

Original advisory text

This issue was addressed with improved checks. This issue is fixed in tvOS 15, watchOS 8, iOS 15 and iPadOS 15. Processing a maliciously crafted dfont file may lead to arbitrary code execution.

References

https://support.apple.com/en-us/HT212814 Release Notes Vendor Advisory
https://support.apple.com/en-us/HT212815 Release Notes Vendor Advisory
https://support.apple.com/en-us/HT212819 Release Notes Vendor Advisory
https://support.apple.com/kb/HT212869 Vendor Advisory

Fix within

Internet-facing 14 days

Internal At next upgrade

Not known to be exploited
Needs hands-on effort to exploit (estimated)
Gives an attacker full control (estimated)

Severity

7.8 High

Exploitation

1% chance of attack within 30 days

Timeline

Published28 Oct 2021

Updated4 Nov 2026

First seen29 Sep 2026

Sources

CVE-2021-30840 · NVD

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