Improper Initialization in macOS - CVE-2021-1857

Vulnerability identifier: #VU52600

CSH Severity: Medium

CVSS v4: 6.9 [CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:A/VC:H/VI:N/VA:N/SC:N/SI:N/SA:N]

CVE-ID: CVE-2021-1857

CWE-ID: CWE-665

Exploitation vector: Remote access

Exploit availability: No public exploit available

The vulnerability allows a remote attacker to gain access to sensitive information.

The vulnerability exists due to improper initialization within the CFNetwork component when processing crafted web content. A remote attacker can trick the victim to open a specially crafted webpage, trigger memory corruption and gain access to sensitive information.

macOS
watchOS
iPadOS
tvOS
Apple iOS
iCloud for Windows
iTunes

Install updates from vendor's website.

macOS - addressed in versions 10.14.6 18G9028, 10.15.7 19H1030, 11.3 20E232
watchOS - update to 7.4 18T195
iPadOS - update to 14.5 18E199
tvOS - update to 14.5 18L204
Apple iOS - update to 14.5 18E199
iCloud for Windows - update to 12.3
iTunes - update to 12.11.3

• https://support.apple.com/en-us/HT212326
• https://support.apple.com/en-us/HT212325
• https://support.apple.com/en-us/HT212327

• Multiple vulnerabilities in macOS
• Multiple vulnerabilities in Apple iCloud for Windows
• Multiple vulnerabilities in Apple iTunes for Windows
• Multiple vulnerabilities in Apple iOS and iPadOS
• Multiple vulnerabilities in Apple tvOS
• Multiple vulnerabilities in Apple watchOS