Actively exploited in the wild
Apple iOS, iPadOS, and macOS WebKit Remote Code Execution Vulnerability
Apple - iOS, iPadOS, and macOS · Listed in the CISA KEV since 2021-11-03. This indicates confirmed attacks in production environments.
Required action: Apply updates per vendor instructions.
CVE-2021-1871
CriticalCVSS 9.8KEVSummary
A logic issue was addressed with improved restrictions. This issue is fixed in macOS Big Sur 11.2, Security Update 2021-001 Catalina, Security Update 2021-001 Mojave, iOS 14.4 and iPadOS 14.4. A remote attacker may be able to cause arbitrary code execution.
Risk Assessment
The vulnerability has been actively exploited, posing a high risk to unpatched Apple devices. An attacker may remotely execute arbitrary code, potentially leading to full device compromise.
Recommendation
Immediately update Apple devices to macOS Big Sur 11.2, Security Update 2021-001 Catalina, Security Update 2021-001 Mojave, iOS 14.4, or iPadOS 14.4. Due to active exploitation, treat this update as a priority.
Other vulnerabilities in Apple macOS / iOS / iPadOS
Original NVD description (English source)
A logic issue was addressed with improved restrictions. This issue is fixed in macOS Big Sur 11.2, Security Update 2021-001 Catalina, Security Update 2021-001 Mojave, iOS 14.4 and iPadOS 14.4. A remote attacker may be able to cause arbitrary code execution. Apple is aware of a report that this issue may have been actively exploited..