Buffer overflow in macOS - CVE-2021-30909

Vulnerability identifier: #VU57719

CSH Severity: Low

CVSS v4: 8.5 [CVSS:4.0/AV:L/AC:L/AT:N/PR:L/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N]

CVE-ID: CVE-2021-30909

CWE-ID: CWE-119

Exploitation vector: Local access

Exploit availability: No public exploit available

The vulnerability allows a local user to escalate privileges on the system.

The vulnerability exists due to a boundary error within the macOS kernel subsystem. A local user can run a specially crafted program to trigger memory corruption and execute arbitrary code with kernel privileges.

macOS
watchOS
tvOS
iPadOS
Apple iOS

Install updates from vendor's website.

macOS - addressed in versions 11.6.1 20G224, 10.15.7 19H1519, 12.0.1 21A559
watchOS - update to 8.1 19R570
tvOS - update to 15.1 19J572
iPadOS - addressed in versions 14.8.1 18H107, 15.1 19B74, 15.1 19B75
Apple iOS - addressed in versions 14.8.1 18H107, 15.1 19B74

• https://support.apple.com/en-us/HT212872

• Multiple vulnerabilities in macOS Big Sur
• Multiple vulnerabilities in macOS Catalina
• Multiple vulnerabilities in macOS Monterey
• Multiple vulnerabilities in Apple iOS 15 and iPadOS 15
• Multiple vulnerabilities in Apple iOS 14 and iPadOS 14
• Multiple vulnerabilities in Apple watchOS
• Multiple vulnerabilities in Apple tvOS