Buffer overflow in iPadOS and Apple iOS - CVE-2021-30843
Published: September 20, 2021
Vulnerability identifier: #VU56722
CSH Severity: High
CVSS v4: 8.6 [CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:A/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N]
CVE-ID: CVE-2021-30843
CWE-ID: CWE-119
Exploitation vector: Remote access
Exploit availability:
No public exploit available
Vulnerability details
The vulnerability allows a remote attacker to execute arbitrary code on the target system.
The vulnerability exists due to a boundary error when processing font files within FontParser. A remote attacker can create a specially crafted document or a web page with a malicious font, trick the victim into opening it, trigger memory corruption and execute arbitrary code on the target system.
Successful exploitation of this vulnerability may result in complete compromise of vulnerable system.
Affected software
iPadOS
Apple iOS
watchOS
macOS
tvOS
Apple iOS
watchOS
macOS
tvOS
How to mitigate CVE-2021-30843
Install updates from vendor's website.
iPadOS - update to 15.0 19A346
Apple iOS - update to 15.0 19A346
watchOS - update to 8.0 19R346
macOS - addressed in versions 10.15.7 19H1417, 11.6 20G165
tvOS - update to 15.0 19J346
Apple iOS - update to 15.0 19A346
watchOS - update to 8.0 19R346
macOS - addressed in versions 10.15.7 19H1417, 11.6 20G165
tvOS - update to 15.0 19J346