CVE-2025-32059 is a stack-based buffer overflow vulnerability (CWE-121) found in the Bluetooth stack developed by Alps Alpine for Bosch Infotainment system ECUs. The flaw arises due to insufficient boundary validation of user-supplied data packets received over the upper layer L2CAP channel, a protocol used for multiplexing data between Bluetooth devices. When a specially crafted packet is sent to the vulnerable ECU, the lack of proper input validation causes a stack buffer overflow, enabling an attacker to overwrite the stack memory. This memory corruption can be exploited to achieve remote code execution with root privileges on the Infotainment ECU. The vulnerability does not require prior authentication or user interaction, making it remotely exploitable over Bluetooth. The affected product version identified is 283C30861E, with the first known affected vehicle being the Nissan Leaf ZE1 manufactured in 2020. The CVSS v3.1 score of 8.8 reflects high impact on confidentiality, integrity, and availability, with low attack complexity and no privileges or user interaction required. Although no public exploits have been reported, the potential for attackers to gain full control over the infotainment system poses serious risks, including manipulation of vehicle functions or persistent malware installation. The vulnerability was publicly disclosed in early 2026, and no official patches have been linked yet.

The vulnerability allows remote attackers to execute arbitrary code with root privileges on the Bosch Infotainment ECU, compromising the confidentiality, integrity, and availability of the vehicle's infotainment system. This could lead to unauthorized access to sensitive data, manipulation or disruption of vehicle functions connected to the ECU, and potential pivoting to other vehicle networks or systems. The root-level access could enable attackers to install persistent malware, disrupt vehicle operation, or interfere with driver information systems. Given the Bluetooth attack vector, attackers could exploit this vulnerability from a short distance without physical access or user interaction. The impact extends to vehicle safety, privacy, and operational reliability, posing significant risks to drivers and passengers. Organizations involved in automotive manufacturing, fleet management, and vehicle maintenance could face operational disruptions, reputational damage, and regulatory consequences if exploited.

1. Immediate deployment of vendor-supplied patches or firmware updates once available is critical to remediate the vulnerability. 2. Until patches are released, disable or restrict Bluetooth connectivity on affected vehicles, especially in public or untrusted environments. 3. Implement network-level controls such as Bluetooth signal jamming or filtering to limit unauthorized access to the Infotainment ECU. 4. Conduct thorough security assessments and penetration testing on vehicle infotainment systems to identify similar vulnerabilities. 5. Employ runtime protections such as stack canaries, address space layout randomization (ASLR), and control flow integrity (CFI) in ECU firmware to mitigate exploitation impact. 6. Monitor vehicle telemetry and logs for anomalous Bluetooth activity or unexpected ECU behavior. 7. Educate vehicle users and fleet operators about the risks of connecting to unknown Bluetooth devices. 8. Collaborate with automotive cybersecurity vendors to deploy intrusion detection systems tailored for in-vehicle networks. 9. Establish incident response plans specific to automotive ECU compromises to enable rapid containment and recovery.