CVE-2025-24177: Apple iPadOS DoS Vulnerability

CVE-2025-24177 Overview

A null pointer dereference vulnerability has been identified in Apple's operating systems that could allow a remote attacker to cause a denial-of-service condition. The vulnerability stems from insufficient input validation, which Apple has addressed through improved input validation mechanisms in the affected products.

Critical Impact

A remote attacker may be able to cause a denial-of-service on affected Apple devices without requiring authentication or user interaction.

Affected Products

• Apple macOS (versions prior to Sequoia 15.3)
• Apple iOS (versions prior to 18.3)
• Apple iPadOS (versions prior to 18.3)

Discovery Timeline

• 2025-01-27 - CVE-2025-24177 published to NVD
• 2025-11-03 - Last updated in NVD database

Technical Details for CVE-2025-24177

Vulnerability Analysis

This vulnerability is classified as CWE-476 (NULL Pointer Dereference), a memory corruption issue that occurs when a program attempts to dereference a pointer that has a NULL (or invalid) value. In the context of this Apple vulnerability, the flaw exists due to improper input validation that allows specially crafted network input to trigger a code path where a pointer is dereferenced without proper null checks.

NULL pointer dereference vulnerabilities typically result in application crashes or system instability. When exploited successfully, an attacker can trigger a denial-of-service condition, causing the affected service or application to terminate unexpectedly. While this vulnerability does not enable code execution or data exfiltration, the availability impact is significant as it can disrupt normal device operations.

The network-based attack vector makes this vulnerability particularly concerning for devices that are exposed to untrusted network traffic. No privileges or user interaction are required to exploit this issue, making it a viable target for remote attackers.

Root Cause

The root cause of this vulnerability is insufficient input validation in the affected Apple software components. When processing network-derived data, the code fails to properly validate inputs before using them to derive pointer values. This allows an attacker to supply malformed input that results in a NULL pointer being dereferenced during execution.

Apple addressed this issue by implementing improved input validation checks that ensure pointer values are properly validated before dereferencing, preventing the null pointer condition from occurring.

Attack Vector

The attack vector for CVE-2025-24177 is network-based, meaning an attacker can exploit this vulnerability remotely without requiring local access to the target device. The exploitation does not require any user interaction or special privileges, making it accessible to opportunistic attackers.

To exploit this vulnerability, an attacker would craft malicious network packets or requests designed to trigger the null pointer dereference condition. When the vulnerable Apple system processes this malicious input, the lack of proper validation causes the null pointer to be dereferenced, resulting in a crash and denial of service.

The attack mechanism involves sending specially crafted network data that bypasses initial validation but causes a null pointer condition in subsequent processing stages. This demonstrates the importance of defense-in-depth input validation throughout the entire code path, not just at entry points.

Detection Methods for CVE-2025-24177

Indicators of Compromise

• Unexpected application or system crashes on Apple devices following network activity
• Repeated crash logs referencing null pointer exceptions or memory access violations
• Network traffic patterns indicating potential exploitation attempts targeting Apple services
• System logs showing abnormal termination of system processes without clear cause

Detection Strategies

• Monitor system crash reports and logs for null pointer dereference exceptions in system components
• Implement network intrusion detection to identify malformed packets targeting Apple devices
• Deploy endpoint detection and response (EDR) solutions to correlate crash events with network activity
• Analyze crash dumps for patterns consistent with null pointer dereference exploitation

Monitoring Recommendations

• Enable enhanced logging on Apple devices to capture detailed crash diagnostics
• Configure network monitoring to track unusual traffic patterns directed at Apple devices
• Set up alerting for repeated system or application crashes that may indicate active exploitation
• Monitor for unauthorized network connections or unexpected service disruptions

How to Mitigate CVE-2025-24177

Immediate Actions Required

• Update macOS to version Sequoia 15.3 or later immediately
• Update iOS and iPadOS to version 18.3 or later on all affected devices
• Prioritize patching for devices exposed to untrusted networks
• Review network access controls to limit exposure of unpatched devices

Patch Information

Apple has released security updates that address this vulnerability through improved input validation. The fixes are included in:

• macOS Sequoia 15.3 - See Apple Security Advisory 122066
• iOS 18.3 and iPadOS 18.3 - See Apple Security Advisory 122068

Organizations should apply these updates through standard Apple software update mechanisms. Enterprise environments using MDM solutions should push these updates to managed devices as a priority.

Workarounds

• Implement network segmentation to limit exposure of vulnerable devices to untrusted networks
• Deploy network-level filtering to inspect and block potentially malicious traffic before it reaches vulnerable devices
• Consider temporarily isolating critical unpatched devices from external network access until updates can be applied
• Monitor vulnerable devices closely for signs of exploitation while awaiting patch deployment

# Check current macOS version
sw_vers

# Check iOS/iPadOS version via command line (if applicable)
# Navigate to Settings > General > About on iOS devices

# Force software update check on macOS
softwareupdate --list
softwareupdate --install --all