Race condition in macOS - CVE-2021-1884

Vulnerability identifier: #VU52658

CSH Severity: Low

CVSS v4: 5.1 [CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:A/VC:N/VI:N/VA:L/SC:N/SI:N/SA:N]

CVE-ID: CVE-2021-1884

CWE-ID: CWE-362

Exploitation vector: Remote access

Exploit availability: No public exploit available

The vulnerability allows a remote attacker to perform denial of service (DoS) attack.

The vulnerability exists due to a race condition in Heimdal. A remote attacker can crash the application.

macOS
watchOS
tvOS
iPadOS
Apple iOS

Install updates from vendor's website.

macOS - addressed in versions 11.3 20E232, 10.14.6 18G9216, 10.15.7 19H1217
watchOS - update to 7.4 18T195
tvOS - update to 14.5 18L204
iPadOS - update to 14.5 18E199
Apple iOS - update to 14.5 18E199

• https://support.apple.com/en-us/HT212325

• Multiple vulnerabilities in macOS
• Multiple vulnerabilities in Apple iOS and iPadOS
• Multiple vulnerabilities in Apple tvOS
• Multiple vulnerabilities in Apple watchOS
• Multiple vulnerabilities in Apple macOS Mojave
• Multiple vulnerabilities in Apple macOS Catalina