CVE-2026-20650 Overview
A denial-of-service vulnerability exists in Apple's Bluetooth implementation across multiple operating systems. The vulnerability stems from improper input validation when processing Bluetooth packets, allowing an attacker in a privileged network position to cause a denial-of-service condition by sending specially crafted Bluetooth packets to affected devices.
Critical Impact
An attacker positioned on the network can exploit this vulnerability to render Apple devices unresponsive or crash them by sending maliciously crafted Bluetooth packets, potentially disrupting enterprise operations and user productivity.
Affected Products
- watchOS 26.3 and earlier versions
- tvOS 26.3 and earlier versions
- macOS Tahoe 26.3 and earlier versions
- visionOS 26.3 and earlier versions
- iOS 26.3 and iPadOS 26.3 and earlier versions
Discovery Timeline
- 2026-02-11 - CVE-2026-20650 published to NVD
- 2026-02-12 - Last updated in NVD database
Technical Details for CVE-2026-20650
Vulnerability Analysis
This vulnerability is classified as CWE-400 (Uncontrolled Resource Consumption), indicating that the affected Bluetooth stack fails to properly validate incoming packet data before processing. When a device receives malformed Bluetooth packets, the improper validation allows resource exhaustion or causes the Bluetooth subsystem to enter an invalid state, resulting in denial of service.
The attack requires a privileged network position, meaning the attacker must have some level of proximity or network access to the target device. While Bluetooth typically operates over short-range wireless connections, the network-based attack vector suggests potential exploitation through Bluetooth over IP scenarios or related networking protocols that handle Bluetooth traffic.
Root Cause
The root cause is inadequate input validation in the Bluetooth packet processing routines. When crafted packets with unexpected or malformed data are received, the system fails to properly sanitize or reject the malicious input. This allows the attacker to trigger resource exhaustion, buffer handling errors, or other conditions that disrupt normal Bluetooth service operation.
Apple addressed this issue by implementing improved validation checks on incoming Bluetooth packets to ensure malformed data is properly rejected before it can impact system stability.
Attack Vector
The attack requires the adversary to be in a privileged network position relative to the target device. From this position, the attacker sends specially crafted Bluetooth packets to the vulnerable device. The malformed packets exploit the validation weakness, causing the Bluetooth stack to consume excessive resources or enter an error state.
The exploitation process involves:
- Positioning within range or network proximity to the target Apple device
- Crafting Bluetooth packets with malformed or unexpected data fields
- Transmitting the crafted packets to the target device's Bluetooth interface
- The vulnerable validation logic fails to reject the malicious packets
- The device experiences denial of service, potentially requiring restart
Detection Methods for CVE-2026-20650
Indicators of Compromise
- Unexpected Bluetooth service crashes or restarts on Apple devices
- System logs showing Bluetooth stack errors or resource exhaustion warnings
- Devices becoming unresponsive when Bluetooth is enabled
- Repeated Bluetooth disconnections without user interaction
Detection Strategies
- Monitor system logs for Bluetooth-related crashes or kernel panics across managed Apple devices
- Implement network monitoring to detect unusual Bluetooth-over-IP traffic patterns
- Configure endpoint detection solutions to alert on repeated Bluetooth service failures
- Review crash reports for patterns indicating exploitation attempts
Monitoring Recommendations
- Enable centralized logging for all Apple devices in the enterprise environment
- Monitor for unusual patterns of device restarts or Bluetooth service interruptions
- Implement alerting for multiple devices experiencing Bluetooth issues simultaneously
- Track system diagnostic reports for Bluetooth-related error signatures
How to Mitigate CVE-2026-20650
Immediate Actions Required
- Update all affected Apple devices to the latest patched operating system versions
- Disable Bluetooth on critical devices where the feature is not required until patches can be applied
- Implement network segmentation to limit attacker positioning opportunities
- Review and restrict Bluetooth connectivity policies in enterprise MDM solutions
Patch Information
Apple has released security updates that address this vulnerability with improved validation logic. Organizations should apply the following updates:
- watchOS: Update to version 26.3 or later - see Apple Support Document #126346
- tvOS: Update to version 26.3 or later - see Apple Support Document #126348
- macOS Tahoe: Update to version 26.3 or later - see Apple Support Document #126351
- visionOS: Update to version 26.3 or later - see Apple Support Document #126352
- iOS and iPadOS: Update to version 26.3 or later - see Apple Support Document #126353
Workarounds
- Disable Bluetooth functionality on devices where it is not essential for operations
- Use Mobile Device Management (MDM) to enforce Bluetooth restrictions on unpatched devices
- Limit network access and physical proximity to sensitive Apple devices
- Consider network-level controls to restrict Bluetooth-over-IP traffic where applicable
# MDM configuration profile to restrict Bluetooth (example)
# Deploy via Apple Configurator or MDM solution
# Restriction key: allowBluetoothModification = false
# This prevents users from enabling Bluetooth on managed devices
Disclaimer: This content was generated using AI. While we strive for accuracy, please verify critical information with official sources.
