CVE-2025-43347: Apple iPadOS Input Validation Vulnerability

CVE-2025-43347 Overview

CVE-2025-43347 is a critical input validation vulnerability affecting multiple Apple operating systems including iOS, iPadOS, macOS, tvOS, visionOS, and watchOS. The vulnerability stems from improper input validation (CWE-20) that could allow remote attackers to compromise affected devices without requiring authentication or user interaction. Apple addressed this issue by removing the vulnerable code entirely from the affected platforms.

Critical Impact

This network-exploitable vulnerability allows unauthenticated remote attackers to potentially achieve complete system compromise with high impact to confidentiality, integrity, and availability across Apple's entire device ecosystem.

Affected Products

• Apple iOS and iPadOS (versions prior to iOS 26/iPadOS 26)
• Apple macOS (affected versions)
• Apple tvOS (versions prior to tvOS 26)
• Apple visionOS (versions prior to visionOS 26)
• Apple watchOS (versions prior to watchOS 26)

Discovery Timeline

• September 15, 2025 - CVE-2025-43347 published to NVD
• November 4, 2025 - Last updated in NVD database

Technical Details for CVE-2025-43347

Vulnerability Analysis

CVE-2025-43347 represents an input validation vulnerability that affects a wide range of Apple operating systems. The vulnerability exists due to insufficient validation of user-supplied input in a core system component shared across Apple's device ecosystem. This improper input validation (CWE-20) could allow attackers to supply specially crafted input that bypasses security controls and potentially leads to unauthorized system access.

The vulnerability is particularly concerning because it is network-accessible, requires no privileges or authentication to exploit, and does not require any user interaction. This combination of factors makes it highly exploitable from a remote attack perspective. The impact spans across confidentiality, integrity, and availability, suggesting attackers could potentially read sensitive data, modify system state, or cause service disruptions.

Root Cause

The root cause of this vulnerability is improper input validation (CWE-20) within a shared component across Apple's operating systems. The vulnerable code failed to properly sanitize or validate input before processing, creating an attack surface that could be exploited remotely. Apple's remediation approach of completely removing the vulnerable code indicates the affected functionality was either deprecated, moved to a more secure implementation, or deemed unnecessary for the system's operation.

Attack Vector

The attack vector for CVE-2025-43347 is network-based, allowing remote exploitation without requiring local access to the target device. An attacker could potentially exploit this vulnerability by:

1. Sending specially crafted network requests to a vulnerable Apple device
2. The malicious input would reach the vulnerable code path without proper validation
3. The unvalidated input could trigger unintended behavior, potentially leading to code execution or system compromise

The vulnerability's exploitation does not require authentication, elevated privileges, or user interaction, making it particularly dangerous for internet-connected devices.

Since no verified exploit code examples are available for this vulnerability, the specific technical mechanism remains partially disclosed. Organizations should refer to Apple's security advisories for additional technical details about the vulnerable component and exploitation methodology.

Detection Methods for CVE-2025-43347

Indicators of Compromise

• Unusual network traffic patterns targeting Apple device services
• Unexpected system crashes or service restarts on Apple devices
• Anomalous process behavior or unauthorized network connections from Apple devices
• System log entries indicating input validation failures or malformed requests

Detection Strategies

• Deploy network intrusion detection systems (NIDS) to monitor for exploitation attempts targeting Apple services
• Implement endpoint detection and response (EDR) solutions to identify post-exploitation activity
• Monitor device management platforms for unexpected configuration changes or policy violations
• Enable verbose logging on network infrastructure to capture potential exploitation traffic

Monitoring Recommendations

• Configure centralized logging for all Apple devices to capture security-relevant events
• Establish baseline behavioral profiles for Apple devices to detect anomalous activity
• Monitor Mobile Device Management (MDM) solutions for unauthorized enrollment or configuration changes
• Implement network segmentation to limit lateral movement from potentially compromised Apple devices

How to Mitigate CVE-2025-43347

Immediate Actions Required

• Update all Apple devices to the latest operating system versions (iOS 26, iPadOS 26, tvOS 26, visionOS 26, watchOS 26, and the latest macOS)
• Prioritize patching of internet-facing and high-value Apple devices
• Enable automatic updates on Apple devices to ensure timely patch deployment
• Audit device inventory to identify all Apple devices requiring updates

Patch Information

Apple has addressed CVE-2025-43347 by removing the vulnerable code from affected operating systems. Security patches are available in the following versions:

• iOS 26 and iPadOS 26 - See Apple Security Update Advisory #125108
• tvOS 26 - See Apple Security Update Advisory #125114
• visionOS 26 - See Apple Security Update Advisory #125115
• watchOS 26 - See Apple Security Update Advisory #125116

Organizations should apply these updates immediately through their device management solutions or direct device updates.

Workarounds

• Implement network-level controls to restrict access to vulnerable Apple devices from untrusted networks
• Enable firewall rules to limit inbound connections to Apple devices where feasible
• Consider network isolation for unpatched devices until updates can be applied
• Monitor affected devices closely for signs of compromise until patching is complete

# Verify iOS/iPadOS version via MDM or device settings
# Navigate to: Settings > General > About > Software Version
# Ensure version is 26.0 or later

# For enterprise environments, use MDM queries to identify unpatched devices
# Example: Query device OS versions across managed fleet
# Prioritize devices running versions earlier than 26.x for immediate update