CVE-2026-2541 identifies a cryptographic weakness in the Micca Auto Electronics Co., Ltd. KE700 car alarm system, specifically related to its rolling code authentication mechanism. The system uses a 6-bit segment of an identifier as part of the rolling code, which provides only 64 possible combinations. This low entropy (CWE-331) significantly reduces the complexity of brute-force attacks against the rolling code component. An attacker can exploit this by systematically trying all possible 64 values to predict the next valid rolling code, thereby bypassing the authentication mechanism. This vulnerability compromises the confidentiality and integrity of the vehicle's security system, allowing unauthorized access or control. The attack vector requires physical proximity (adjacent wireless range) but does not require any privileges, user interaction, or prior authentication. The CVSS 4.0 score of 6.4 reflects a medium severity, considering the attack complexity is low, but the scope and impact are limited to the affected product. No patches or firmware updates have been published yet, and no known exploits are reported in the wild. The vulnerability highlights the critical importance of using sufficiently large entropy pools in cryptographic authentication mechanisms, especially in automotive security systems where physical security is paramount.

For European organizations, especially those with fleets or employees using vehicles equipped with the Micca KE700 system, this vulnerability poses a tangible risk of unauthorized vehicle access, theft, or tampering. The compromise of rolling code authentication can lead to breaches of physical security, potentially resulting in financial losses, operational disruptions, and reputational damage. Insurance claims may increase due to vehicle thefts exploiting this weakness. Additionally, organizations involved in logistics, transportation, or delivery services relying on these vehicles could face operational delays or safety incidents. The vulnerability also undermines trust in automotive security technologies, possibly affecting compliance with European automotive and data protection regulations. Since the attack requires proximity, vehicles parked in public or unsecured areas are at higher risk. The limited entropy issue may also raise concerns about the overall security posture of Micca’s automotive products, prompting broader scrutiny.

1. Immediate mitigation involves restricting physical access to vehicles equipped with the KE700 system, such as parking in secured garages or monitored areas. 2. Organizations should engage with Micca Auto Electronics to request firmware updates or patches that increase entropy in the rolling code mechanism or replace the vulnerable authentication scheme. 3. If firmware updates are unavailable, consider disabling the rolling code feature or supplementing it with additional physical security measures like steering locks or GPS tracking. 4. Implement layered security controls including vehicle immobilizers and alarm systems independent of the vulnerable component. 5. Conduct regular security assessments of automotive security systems in organizational fleets to identify similar weaknesses. 6. Train staff and users on the risks of proximity-based attacks and encourage vigilance in vehicle security. 7. Monitor for any emerging exploits or advisories related to this CVE and respond promptly. 8. Collaborate with insurance providers to understand coverage implications and possibly adjust policies accordingly.