CVE-2025-43193: Apple macOS Denial-of-Service Vulnerability

CVE-2025-43193 Overview

CVE-2025-43193 is a memory handling vulnerability affecting multiple versions of Apple macOS. The flaw exists due to improper memory handling within the operating system, which can be exploited by a malicious application to cause a denial-of-service condition. Apple has addressed this vulnerability through improved memory handling in macOS Sequoia 15.6, macOS Ventura 13.7.7, and macOS Sonoma 14.7.7.

Critical Impact

A local application can exploit this memory handling flaw to cause system instability or denial-of-service, potentially disrupting critical business operations on affected macOS systems.

Affected Products

• macOS Sequoia (versions prior to 15.6)
• macOS Sonoma (versions prior to 14.7.7)
• macOS Ventura (versions prior to 13.7.7)

Discovery Timeline

• July 30, 2025 - CVE-2025-43193 published to NVD
• November 3, 2025 - Last updated in NVD database

Technical Details for CVE-2025-43193

Vulnerability Analysis

This vulnerability is classified under CWE-400 (Uncontrolled Resource Consumption), which indicates that the flaw allows an attacker to cause the system to consume excessive resources through improper memory handling. The vulnerability exists in the core memory management routines of macOS, where insufficient validation or improper handling of memory operations can be exploited by a locally running application.

When a malicious application triggers specific memory operations, the system fails to properly manage memory resources, leading to resource exhaustion. This can result in system unresponsiveness, application crashes, or a complete denial-of-service condition requiring a system restart.

Root Cause

The root cause of CVE-2025-43193 is improper memory handling within macOS. The operating system fails to adequately control memory allocation or deallocation operations, allowing applications to trigger resource exhaustion conditions. This weakness in memory management routines permits malicious or poorly designed applications to consume system resources beyond acceptable limits, ultimately leading to service disruption.

Attack Vector

The attack vector for this vulnerability is network-based according to the CVSS classification, though the practical exploitation requires a malicious application to be executed on the target system. An attacker could deliver the malicious application through various means including:

• Tricking users into downloading and executing a malicious application
• Exploiting other vulnerabilities to install the malicious application
• Leveraging legitimate software distribution channels if compromised

Once executed, the malicious application can trigger the memory handling flaw to cause denial-of-service conditions on the affected macOS system.

Detection Methods for CVE-2025-43193

Indicators of Compromise

• Unexpected system slowdowns or unresponsiveness on macOS systems
• Abnormal memory consumption patterns by applications with no legitimate reason for high resource usage
• Kernel panic logs or crash reports indicating memory-related failures
• Applications consuming disproportionate system resources compared to their expected behavior

Detection Strategies

• Monitor system resource utilization for anomalous memory consumption patterns across macOS endpoints
• Implement application allowlisting to prevent unauthorized applications from executing
• Review system logs for kernel panics or memory-related error messages that may indicate exploitation attempts
• Deploy endpoint detection solutions capable of identifying applications exhibiting suspicious memory allocation behavior

Monitoring Recommendations

• Enable and regularly review macOS system diagnostic logs for memory-related errors
• Configure alerting for sudden spikes in memory usage across monitored endpoints
• Implement centralized logging to correlate potential exploitation attempts across multiple systems
• Monitor for new or unknown applications appearing on systems that could be exploitation vectors

How to Mitigate CVE-2025-43193

Immediate Actions Required

• Update all macOS Sequoia systems to version 15.6 or later
• Update all macOS Sonoma systems to version 14.7.7 or later
• Update all macOS Ventura systems to version 13.7.7 or later
• Restrict application installation to trusted sources only pending patch deployment

Patch Information

Apple has released security updates addressing this vulnerability. Organizations should apply the following updates immediately:

• macOS Sequoia 15.6 - See Apple Support Advisory 124149 for details
• macOS Sonoma 14.7.7 - See Apple Support Advisory 124150 for details
• macOS Ventura 13.7.7 - See Apple Support Advisory 124151 for details

Additional technical details are available through the Full Disclosure Mailing List.

Workarounds

• Implement strict application control policies to prevent execution of untrusted applications
• Enable Gatekeeper and ensure it is configured to only allow applications from identified developers or the App Store
• Isolate systems that cannot be immediately patched from network access where feasible
• Monitor affected systems closely for signs of resource exhaustion or instability until patches can be applied

# Verify current macOS version
sw_vers -productVersion

# Check for available software updates
softwareupdate --list

# Install all available security updates
softwareupdate --install --all