CVE-2026-4272: Honeywell Handheld Scanners RCE Flaw

CVE-2026-4272 Overview

CVE-2026-4272 is a Missing Authentication for Critical Function vulnerability (CWE-306) affecting Honeywell Handheld Scanners. This security flaw enables Authentication Abuse, allowing a remote attacker within Bluetooth range of the scanner's base station to remotely execute system commands on the host connected to the base station without requiring any authentication.

The vulnerability stems from insufficient authentication controls in the communication between the handheld scanner and its base station, creating a critical security gap that can be exploited by attackers in proximity to the device.

Critical Impact

Remote attackers within Bluetooth range can execute arbitrary system commands on connected host systems without authentication, potentially leading to full system compromise, data theft, or lateral movement within enterprise networks.

Affected Products

• Honeywell Handheld Scanners C1 Base (Ingenic x1000) - versions before GK000432BAA
• Honeywell Handheld Scanners D1 Base (Ingenic x1600) - versions before HE000085BAA
• Honeywell Handheld Scanners A1/B1 Base (IMX25) - versions before BK000763BAA_BK000765BAA_CU000101BAA

Discovery Timeline

• April 5, 2026 - CVE-2026-4272 published to NVD
• April 7, 2026 - Last updated in NVD database

Technical Details for CVE-2026-4272

Vulnerability Analysis

This vulnerability is classified as Missing Authentication for Critical Function (CWE-306), a serious security weakness where a critical system function lacks proper authentication controls. In the context of Honeywell Handheld Scanners, the base station fails to properly authenticate incoming commands, allowing unauthorized actors to issue system-level commands to connected hosts.

The attack surface is network-based but limited to Bluetooth range, meaning an attacker must be in physical proximity to the target device. However, once within range, no user interaction is required to exploit this vulnerability beyond the initial Bluetooth connection attempt. The impact includes potential compromise of both confidentiality and integrity of connected systems, though availability is not directly affected.

Root Cause

The root cause of CVE-2026-4272 lies in the absence of authentication mechanisms for critical functions within the Honeywell Handheld Scanner base station firmware. The base station accepts and processes commands from Bluetooth-connected devices without verifying the identity or authorization of the requesting entity.

This design flaw allows any device within Bluetooth range to establish a connection and send commands that the base station will forward to the connected host system, effectively bypassing all security controls that would normally protect such critical functionality.

Attack Vector

The attack vector for CVE-2026-4272 involves an attacker positioning themselves within Bluetooth range of a vulnerable Honeywell Handheld Scanner base station. The exploitation process follows these steps:

1. The attacker scans for active Honeywell base stations broadcasting Bluetooth signals
2. Upon identifying a vulnerable target, the attacker establishes a Bluetooth connection to the base station
3. Without any authentication challenge, the attacker can then send specially crafted commands
4. These commands are relayed by the base station to the connected host system
5. The host system executes the commands, potentially giving the attacker remote code execution capabilities

The vulnerability mechanism relies on the base station acting as an unauthenticated bridge between Bluetooth communications and the host system. Since no authentication is required, any device capable of Bluetooth communication can potentially exploit this flaw. Technical details and remediation guidance can be found in the NIST CVE-2026-4272 Details.

Detection Methods for CVE-2026-4272

Indicators of Compromise

• Unexpected Bluetooth connection attempts to Honeywell scanner base stations from unknown devices
• Unusual command execution patterns on hosts connected to scanner base stations
• Unauthorized system commands appearing in host system logs originating from scanner interfaces
• Anomalous network activity from systems hosting scanner base station connections

Detection Strategies

• Implement Bluetooth connection logging and monitoring for all Honeywell scanner base stations
• Deploy endpoint detection solutions on systems connected to scanner base stations to identify unauthorized command execution
• Enable comprehensive audit logging on host systems to capture commands received through scanner interfaces
• Utilize network segmentation monitoring to detect unusual traffic patterns from scanner-connected hosts

Monitoring Recommendations

• Regularly review Bluetooth device pairing logs for unauthorized connection attempts
• Implement real-time alerting for command execution on scanner-connected hosts outside normal operational patterns
• Monitor firmware versions across all deployed Honeywell Handheld Scanners to identify unpatched devices
• Establish baseline behavior for scanner base station communications and alert on deviations

How to Mitigate CVE-2026-4272

Immediate Actions Required

• Identify all Honeywell Handheld Scanners in your environment and document their current firmware versions
• Prioritize patching for scanners in high-security or publicly accessible areas where Bluetooth range exploitation is more likely
• Implement physical security controls to limit unauthorized proximity to scanner base stations
• Consider temporarily disabling Bluetooth functionality on scanners if operationally feasible until patches are applied

Patch Information

Honeywell has released firmware updates to address this vulnerability. Organizations should upgrade to the following minimum versions:

• C1 Base (Ingenic x1000): Update to firmware version GK000432BAA or later
• D1 Base (Ingenic x1600): Update to firmware version HE000085BAA or later
• A1/B1 Base (IMX25): Update to firmware version BK000763BAA_BK000765BAA_CU000101BAA or later

Honeywell strongly recommends that all users upgrade to the latest firmware versions immediately to resolve this vulnerability.

Workarounds

• Implement network segmentation to isolate systems connected to scanner base stations from critical network resources
• Deploy physical barriers or access controls to limit proximity access to scanner base stations in sensitive areas
• Enable Bluetooth device whitelisting where supported to restrict connections to known, authorized devices
• Monitor and restrict the commands that can be executed on host systems through scanner interfaces using application whitelisting

# Example: Verify Honeywell scanner firmware version
# Check current firmware version on your scanner base station
# and compare against the patched versions listed above

# For C1 Base: Should be GK000432BAA or later
# For D1 Base: Should be HE000085BAA or later  
# For A1/B1 Base: Should be BK000763BAA_BK000765BAA_CU000101BAA or later

# Consult Honeywell documentation for firmware update procedures
# specific to your scanner model and deployment environment