CVE-2021-30883
📋 TL;DR
This is a memory corruption vulnerability in Apple operating systems that allows an application to execute arbitrary code with kernel privileges. It affects iOS, iPadOS, macOS, tvOS, and watchOS. Apple has confirmed this vulnerability may have been actively exploited in the wild.
💻 Affected Systems
- iOS
- iPadOS
- macOS
- tvOS
- watchOS
📦 What is this software?
Ipados by Apple
Ipados by Apple
Macos by Apple
macOS is Apple's desktop and laptop operating system powering Mac computers used by millions of professionals, developers, creative professionals, and enterprise users worldwide. Built on a Unix foundation with the Darwin kernel and modern Cocoa frameworks, macOS delivers a seamless ecosystem integr...
Learn more about Macos →Macos by Apple
macOS is Apple's desktop and laptop operating system powering Mac computers used by millions of professionals, developers, creative professionals, and enterprise users worldwide. Built on a Unix foundation with the Darwin kernel and modern Cocoa frameworks, macOS delivers a seamless ecosystem integr...
Learn more about Macos →Tvos by Apple
Watchos by Apple
⚠️ Risk & Real-World Impact
Worst Case
Complete system compromise with kernel-level privileges, allowing attackers to install persistent malware, access all data, and bypass all security controls.
Likely Case
Privilege escalation leading to data theft, surveillance, or installation of backdoors on compromised devices.
If Mitigated
Limited impact if devices are fully patched and have additional security controls like application sandboxing and endpoint protection.
🎯 Exploit Status
Apple confirmed active exploitation. Requires user interaction (running a malicious application).
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: iOS 15.0.2, iPadOS 15.0.2, macOS Monterey 12.0.1, iOS 14.8.1, iPadOS 14.8.1, tvOS 15.1, watchOS 8.1, macOS Big Sur 11.6.1
Vendor Advisory: https://support.apple.com/en-us/HT212846
Restart Required: Yes
Instructions:
1. Open Settings app. 2. Go to General > Software Update. 3. Download and install the latest available update. 4. Restart device when prompted.
🔧 Temporary Workarounds
Application Restriction
allRestrict installation of applications from untrusted sources to reduce attack surface.
🧯 If You Can't Patch
- Isolate affected devices from critical networks and sensitive data
- Implement strict application allowlisting and monitor for suspicious activity
🔍 How to Verify
Check if Vulnerable:
Check current OS version against affected versions listCheck Version:
iOS/iPadOS: Settings > General > About > Version. macOS: Apple menu > About This Mac > macOS version.Verify Fix Applied:
Verify OS version matches or exceeds patched versions listed in fix_official section📡 Detection & Monitoring
Log Indicators:
- Unexpected kernel extensions or system modifications
- Unusual privilege escalation events
Network Indicators:
- Connections to known malicious domains from system processes
SIEM Query:
source="apple_system_logs" AND (event="kernel_extension_load" OR event="privilege_escalation")🔗 References
- https://support.apple.com/en-us/HT212846
- https://support.apple.com/en-us/HT212868
- https://support.apple.com/en-us/HT212869
- https://support.apple.com/en-us/HT212872
- https://support.apple.com/en-us/HT212874
- https://support.apple.com/en-us/HT212876
- https://support.apple.com/en-us/HT212846
- https://support.apple.com/en-us/HT212868
- https://support.apple.com/en-us/HT212869
- https://support.apple.com/en-us/HT212872
- https://support.apple.com/en-us/HT212874
- https://support.apple.com/en-us/HT212876
- https://www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2021-30883
