CVE-2021-30983
📋 TL;DR
This CVE describes a buffer overflow vulnerability in iOS/iPadOS that allows malicious applications to execute arbitrary code with kernel privileges. It affects Apple mobile devices running versions before iOS 15.2 and iPadOS 15.2. Successful exploitation gives attackers complete control over the affected device.
💻 Affected Systems
- iPhone
- iPad
📦 What is this software?
Ipados by Apple
⚠️ Risk & Real-World Impact
Worst Case
Complete device compromise with kernel-level persistence, data theft, and ability to bypass all security controls.
Likely Case
Malicious app gains full system access, enabling data exfiltration, surveillance, and installation of persistent malware.
If Mitigated
Limited impact if devices are fully patched and app installation is restricted to App Store only.
🎯 Exploit Status
Exploitation requires user to install malicious application. CISA has confirmed active exploitation in the wild.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: iOS 15.2, iPadOS 15.2
Vendor Advisory: https://support.apple.com/en-us/HT212976
Restart Required: Yes
Instructions:
1. Open Settings app. 2. Tap General. 3. Tap Software Update. 4. Download and install iOS 15.2 or later. 5. Device will restart automatically.
🔧 Temporary Workarounds
Restrict App Installation
allLimit app installation to App Store only to prevent malicious app installation.
Settings > Screen Time > Content & Privacy Restrictions > iTunes & App Store Purchases > Installing Apps > Don't Allow
🧯 If You Can't Patch
- Isolate affected devices from sensitive networks and data
- Implement strict mobile device management (MDM) policies to control app installation
🔍 How to Verify
Check if Vulnerable:
Check iOS/iPadOS version in Settings > General > About > Software VersionCheck Version:
Not applicable - check via device Settings UIVerify Fix Applied:
Verify version is 15.2 or higher in Settings > General > About > Software Version📡 Detection & Monitoring
Log Indicators:
- MDM logs showing unauthorized app installations
- Crash reports from kernel processes
Network Indicators:
- Unusual outbound connections from mobile devices
- Data exfiltration patterns
SIEM Query:
device.os.name:iOS AND device.os.version:<15.2 AND event.action:app_install