CVE-2024-54538 Overview
CVE-2024-54538 is a denial-of-service vulnerability affecting multiple Apple operating systems, including iOS, iPadOS, macOS, tvOS, visionOS, and watchOS. The flaw stems from improper input validation and allows a remote attacker to trigger a denial-of-service condition without authentication or user interaction. Apple addressed the issue across its product line through coordinated security updates released in October 2024. The vulnerability is categorized under [CWE-770] (Allocation of Resources Without Limits or Throttling), indicating that resource consumption controls were insufficient to prevent abuse by malformed input.
Critical Impact
A remote, unauthenticated attacker can cause affected Apple devices to enter a denial-of-service state over the network, disrupting availability across iPhone, iPad, Mac, Apple TV, Apple Watch, and Apple Vision Pro devices.
Affected Products
- Apple iOS and iPadOS prior to 17.7.1 and 18.1
- Apple macOS Sequoia prior to 15.1, macOS Sonoma prior to 14.7.1, and macOS Ventura prior to 13.7.1
- Apple tvOS prior to 18.1, visionOS prior to 2.1, and watchOS prior to 11.1
Discovery Timeline
- 2024-12-20 - CVE-2024-54538 published to the National Vulnerability Database
- 2026-04-02 - Last updated in NVD database
Technical Details for CVE-2024-54538
Vulnerability Analysis
The vulnerability resides in input handling logic shared across Apple's operating system platforms. According to Apple's advisory, the issue was addressed through improved input validation, indicating that the affected component failed to properly bound or sanitize attacker-supplied data before processing. The result is a denial-of-service condition impacting service availability without compromising data confidentiality or integrity.
The network-based attack vector and lack of authentication requirements broaden the exposure surface. Any device reachable by an attacker over the network can be targeted, including mobile, desktop, wearable, and mixed-reality endpoints. The EPSS exploitation probability sits in the upper percentile range, suggesting elevated attention from threat actors despite no public proof-of-concept currently being available.
Root Cause
The root cause maps to [CWE-770], where the affected subsystem accepts input without enforcing resource allocation limits or proper validation. Crafted network traffic forces the system into a state where it consumes excessive resources or aborts processing, leading to service interruption. Apple's fix introduces stricter input validation logic to reject malformed or oversized data before it reaches vulnerable processing routines.
Attack Vector
Exploitation occurs over the network and requires no privileges or user interaction. A remote attacker sends specially crafted input to a vulnerable service or protocol handler on the target device. Upon parsing the malicious input, the device enters a denial-of-service state, which may manifest as a crash, hang, or unresponsive system component.
No verified public proof-of-concept exploit is available. The vulnerability mechanism is described in prose because verified exploitation code has not been published. Refer to the Apple Support Document #121564 for vendor-provided technical context.
Detection Methods for CVE-2024-54538
Indicators of Compromise
- Unexpected reboots, kernel panics, or service crashes on Apple endpoints following inbound network traffic from untrusted sources
- Repeated connection attempts from a single source preceding device unresponsiveness or loss of network connectivity
- System logs showing abnormal termination of network-facing services on iOS, macOS, tvOS, visionOS, or watchOS devices
Detection Strategies
- Monitor endpoint telemetry for abnormal process termination patterns and unscheduled reboots on Apple devices
- Correlate network flow data with device availability metrics to identify traffic patterns preceding outages
- Deploy network intrusion detection signatures that flag malformed protocol traffic targeting Apple services
Monitoring Recommendations
- Track operating system versions across the Apple fleet and flag devices running builds older than iOS 17.7.1, iOS 18.1, macOS Sequoia 15.1, macOS Sonoma 14.7.1, macOS Ventura 13.7.1, tvOS 18.1, visionOS 2.1, or watchOS 11.1
- Establish alerting on repeated device crashes or restarts within short time windows, particularly on internet-exposed endpoints
- Aggregate crash reports and network logs in a centralized SIEM to support cross-device correlation
How to Mitigate CVE-2024-54538
Immediate Actions Required
- Apply Apple's security updates to all affected devices: iOS 17.7.1, iOS 18.1, iPadOS 17.7.1, iPadOS 18.1, macOS Sequoia 15.1, macOS Sonoma 14.7.1, macOS Ventura 13.7.1, tvOS 18.1, visionOS 2.1, and watchOS 11.1
- Inventory all Apple devices in the environment and prioritize patching for internet-exposed or high-availability systems
- Restrict inbound network access to Apple devices from untrusted networks pending patch deployment
Patch Information
Apple released patches for this vulnerability across its product lines. Refer to the following Apple support documents for version-specific details: iOS 17.7.1 and iPadOS 17.7.1, iOS 18.1 and iPadOS 18.1, macOS Sequoia 15.1, macOS Sonoma 14.7.1, macOS Ventura 13.7.1, tvOS 18.1, visionOS 2.1, and watchOS 11.1.
Workarounds
- Limit network exposure of Apple devices through firewall rules and network segmentation
- Place high-value Apple endpoints behind VPN or zero-trust access controls to reduce direct internet reachability
- Disable unused network-facing services on macOS systems where feasible until patches are applied
Disclaimer: This content was generated using AI. While we strive for accuracy, please verify critical information with official sources.
