CVE-2025-32057 Overview
CVE-2025-32057 is an improper certificate validation vulnerability (CWE-295) affecting the Infotainment ECU manufactured by Bosch and installed in the Nissan Leaf ZE1 – 2020 model. The system utilizes a Redbend service for over-the-air (OTA) provisioning and software updates, communicating with back-end servers via HTTPS. However, due to the use of default configuration settings in the underlying SSL engine, the server root certificate is not properly verified. This critical oversight allows an attacker to potentially impersonate a legitimate Redbend backend server using a self-signed certificate.
Critical Impact
Attackers can perform man-in-the-middle attacks on OTA update communications, potentially delivering malicious firmware or intercepting sensitive vehicle data.
Affected Products
- Nissan Leaf ZE1 (2020 model year)
- Bosch Infotainment ECU with Redbend OTA service
- Vehicles utilizing the vulnerable SSL/TLS configuration
Discovery Timeline
- 2026-01-22 - CVE CVE-2025-32057 published to NVD
- 2026-01-22 - Last updated in NVD database
Technical Details for CVE-2025-32057
Vulnerability Analysis
The vulnerability stems from improper certificate validation in the Infotainment ECU's SSL/TLS implementation. When the vehicle's infotainment system connects to the Redbend backend server for OTA updates and provisioning, it fails to verify the authenticity of the server's SSL certificate. This means the system accepts any certificate, including self-signed certificates created by attackers.
The attack exploits a fundamental weakness in how the embedded system establishes trust with remote servers. Without proper certificate chain validation against a trusted root CA, the vehicle cannot distinguish between a legitimate Redbend server and a malicious impersonator. This opens the door for man-in-the-middle (MITM) attacks where an adversary positioned on the network path can intercept, modify, or inject data into the communication stream.
The network-based attack vector requires user interaction, as the vehicle owner would need to be connected to a network where the attacker has established presence. However, this could occur in public WiFi environments, compromised home networks, or through other network-level attacks.
Root Cause
The root cause is the use of default SSL engine configuration that does not enforce server certificate validation. This represents a common embedded systems security oversight where development configurations that disable certificate verification for testing purposes are inadvertently shipped in production systems. The Redbend OTA client should have been configured to validate the server certificate against a pinned certificate or trusted root CA store specific to the legitimate backend infrastructure.
Attack Vector
The attack requires network access between the vehicle's infotainment system and the internet. An attacker can position themselves as a man-in-the-middle through various methods including ARP spoofing on local networks, rogue WiFi access points, or DNS hijacking. Once in position, the attacker presents a self-signed certificate claiming to be the Redbend backend server. Because the infotainment ECU does not validate this certificate, it accepts the connection as legitimate, allowing the attacker to intercept sensitive communications or potentially push malicious updates to the vehicle.
Detection Methods for CVE-2025-32057
Indicators of Compromise
- Unexpected SSL/TLS certificate warnings or anomalies in vehicle network communications
- Network traffic showing connections to unauthorized IP addresses purporting to be Redbend servers
- Evidence of ARP spoofing or DNS tampering on networks where the vehicle connects
- Unusual firmware update activity or unexpected changes to infotainment system behavior
Detection Strategies
- Monitor network traffic for SSL/TLS connections that do not match expected certificate fingerprints for legitimate Redbend servers
- Implement network intrusion detection systems (NIDS) to identify potential MITM attack patterns
- Analyze vehicle diagnostic logs for unexpected OTA update attempts or connection anomalies
- Deploy certificate transparency monitoring to detect unauthorized certificates claiming to represent Redbend infrastructure
Monitoring Recommendations
- Conduct regular security assessments of vehicle telematics and infotainment network communications
- Establish baseline network behavior patterns for OTA update communications and alert on deviations
- Monitor for known attack indicators associated with vehicle infotainment system compromises
- Review the Black Hat Presentation on Nissan Leaf for additional technical indicators
How to Mitigate CVE-2025-32057
Immediate Actions Required
- Avoid connecting the vehicle to untrusted or public WiFi networks until a patch is available
- Monitor for official security updates from Nissan or Bosch regarding this vulnerability
- Consider disabling automatic OTA updates until the certificate validation issue is resolved
- Use only trusted, secured network connections for any vehicle connectivity features
Patch Information
Vehicle owners should monitor official communications from Nissan for security updates addressing this vulnerability. Detailed information about the vulnerability can be found in the PCA Cybersecurity Advisory on Nissan. Contact your Nissan dealer for the latest information on available patches or ECU firmware updates.
Workarounds
- Disable WiFi connectivity on the infotainment system when not actively needed
- Avoid connecting to public or unsecured wireless networks
- If OTA updates are required, perform them only on trusted home networks with proper security controls
- Consider using a VPN on the network segment where the vehicle connects to add an additional layer of protection
- Monitor vehicle behavior for any signs of unauthorized modifications following network connectivity
# Network monitoring example for vehicle traffic analysis
# Monitor for suspicious SSL connections on your home network
tcpdump -i eth0 -n 'tcp port 443' -w vehicle_traffic.pcap
# Analyze captured traffic for certificate anomalies
openssl s_client -connect suspected_server:443 -showcerts
Disclaimer: This content was generated using AI. While we strive for accuracy, please verify critical information with official sources.
