CVE-2026-18411 in KARR BT-DR-100
Summary
by MITRE • 08/06/2026
The KARR Security System and SWDS dealer-installed automotive anti-theft systems use a shared Bluetooth authentication key across affected devices. An attacker within Bluetooth range can leverage this weakness to issue unauthorized commands to the vehicle, potentially allowing unauthorized access to vehicle functions, including door unlocking and engine immobilization.
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Analysis
by VulDB Data Team • 08/06/2026
The vulnerability described represents a critical security flaw in automotive anti-theft systems manufactured by KARR Security System and SWDS, where multiple dealer-installed devices utilize identical Bluetooth authentication keys for device communication. This design decision fundamentally undermines the security model of these systems, creating a scenario where any individual within Bluetooth range can exploit this shared credential to gain unauthorized access to vehicle control functions. The flaw directly violates fundamental security principles of key management and authentication, as it eliminates the unique identification and verification mechanisms that should protect each device in a vehicle's security ecosystem.
This vulnerability operates at the protocol level of Bluetooth communication, specifically targeting the authentication mechanism that should establish secure connections between authorized devices and vehicle systems. The shared key approach creates a single point of failure that allows attackers to perform what is known as a credential reuse attack, where a compromised or discovered authentication token can be leveraged across multiple vehicles within range. From an operational perspective, this weakness enables adversaries to execute commands that could compromise vehicle integrity and safety, including unauthorized door unlocking and engine immobilization functions. The attack surface extends beyond simple theft prevention to encompass broader vehicle control capabilities that could pose significant risks to occupants and property.
The technical implications of this vulnerability align with CWE-320: "Weak Cryptographic Hash" and CWE-312: "Cleartext Storage of Sensitive Information," as the shared authentication keys represent a form of weak cryptographic implementation where predictable credentials are used across multiple devices. The attack vector falls under ATT&CK technique T1566: "Phishing" and T1071: "Application Layer Protocol" when considering how attackers might initially gain access to these credentials, though the primary exploitation occurs through direct Bluetooth proximity attacks. This weakness creates a persistent security risk that cannot be mitigated through user behavior changes or standard security practices, as the flaw exists in the system design rather than operational procedures.
The operational impact of this vulnerability extends beyond immediate theft concerns to encompass vehicle safety and privacy risks, particularly as automotive systems become increasingly connected and integrated with mobile applications. Attackers can potentially use this weakness to gain unauthorized access to vehicle functions that could be exploited for various malicious purposes including vehicle theft, hijacking, or even more sophisticated attacks involving multiple compromised vehicles within a geographic area. The vulnerability is particularly concerning given that these systems are typically installed by dealerships and may not receive regular security updates or patches, leaving vehicles in the field permanently vulnerable to this class of attack.
Mitigation strategies must address both immediate operational concerns and long-term architectural improvements to prevent similar vulnerabilities from occurring in future automotive security implementations. Organizations should implement unique authentication keys for each vehicle system, establish secure key distribution mechanisms, and develop regular update protocols that can be applied to installed systems. The vulnerability demonstrates the critical importance of proper key management practices and highlights the need for automotive security standards such as ISO/SAE 21434 that address cybersecurity throughout the vehicle lifecycle. Additionally, manufacturers should consider implementing cryptographic authentication methods that eliminate the possibility of credential reuse attacks while maintaining usability for legitimate users.