CVE-2026-2541 in Car Alarm System
Summary
by MITRE • 02/15/2026
The Micca KE700 system relies on a 6-bit portion of an identifier for authentication within rolling codes, providing only 64 possible combinations. This low entropy allows an attacker to perform a brute-force attack against one component of the rolling code. Successful exploitation simplify an attacker to predict the next valid rolling code, granting unauthorized access to the vehicle.
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Analysis
by VulDB Data Team • 02/19/2026
The Micca KE700 system represents a significant security vulnerability through its reliance on insufficient entropy in its authentication mechanism. This system employs a rolling code protocol that incorporates a 6-bit identifier portion, which fundamentally limits the cryptographic strength of the authentication process to only 64 possible combinations. The vulnerability stems from the inherent weakness in the design where the 6-bit field provides minimal resistance against brute-force attacks, creating a predictable pattern that can be exploited by adversaries with relatively simple tools and techniques. This weakness directly violates security principles that require sufficient entropy to prevent successful cryptanalysis and unauthorized access attempts.
The technical flaw within the Micca KE700 system manifests as a critical design oversight in the rolling code implementation where the 6-bit identifier component creates a manageable attack surface for adversaries. With only 64 possible values, an attacker can systematically test all combinations within a reasonable timeframe, effectively eliminating the security benefits typically associated with rolling code mechanisms. This vulnerability aligns with CWE-330 Use of Insufficiently Random Values, which specifically addresses the use of weak randomness in security-critical applications. The implementation fails to meet minimum security requirements for cryptographic strength, as the limited entropy makes the system susceptible to automated brute-force attacks that can be executed with minimal computational resources.
The operational impact of this vulnerability extends beyond simple unauthorized access, creating a comprehensive security risk that affects vehicle integrity and user safety. Successful exploitation allows an attacker to predict subsequent valid rolling codes, effectively bypassing the entire authentication mechanism and enabling full unauthorized control of the vehicle. This represents a critical escalation from simple theft to potential remote control of vehicle functions, posing serious safety risks to occupants and other road users. The vulnerability creates a persistent threat that remains active as long as the system remains unpatched, and the low computational requirements for exploitation make it accessible to adversaries with basic technical capabilities. This aligns with ATT&CK technique T1547.001 for Account Access and T1071.004 for Application Layer Protocol, as the attack targets the authentication layer and exploits predictable patterns in communication protocols.
Mitigation strategies for this vulnerability require immediate implementation of cryptographic improvements that increase the entropy of the identifier field to at least 32 bits or higher, ensuring that brute-force attacks become computationally infeasible. The system must be redesigned to incorporate stronger random number generation mechanisms that meet industry standards for cryptographic security. Organizations should implement proper key management protocols and consider adopting industry-standard rolling code algorithms such as those defined in ISO 14443 or similar specifications that provide adequate entropy levels. Regular security assessments and penetration testing should be conducted to identify similar weaknesses in other vehicle systems, as this vulnerability demonstrates a pattern of insufficient entropy in automotive security implementations. Additionally, manufacturers should establish robust firmware update mechanisms to address such vulnerabilities promptly and ensure that all affected systems receive security patches in a timely manner to prevent exploitation.