CVE-2025-8476: Alpine iLX-507 Firmware RCE Vulnerability

CVE-2025-8476 Overview

CVE-2025-8476 is an improper certificate validation flaw in the TIDAL music streaming application running on Alpine iLX-507 in-vehicle infotainment head units. The vulnerability allows network-adjacent attackers to intercept TLS-protected communications and inject malicious responses without authentication. User interaction is required, typically by launching or using the TIDAL application on the device. When chained with other vulnerabilities, attackers can execute arbitrary code in the context of root on the head unit. The issue was reported through the Zero Day Initiative as ZDI-CAN-26322 and tracked in advisory ZDI-25-765.

Critical Impact
Network-adjacent attackers within Wi-Fi or other adjacent network range can perform man-in-the-middle attacks against the TIDAL application and, combined with additional flaws, gain root-level code execution on the Alpine iLX-507 head unit.

Affected Products

Alpine iLX-507 hardware (in-vehicle infotainment head unit)
Alpine iLX-507 firmware version 6.0.000
TIDAL streaming application component shipped on the device

Discovery Timeline

2025-08-01 - CVE-2025-8476 published to NVD
2026-06-17 - Last updated in NVD database

Technical Details for CVE-2025-8476

Vulnerability Analysis

The vulnerability resides in the TIDAL music streaming client bundled with the Alpine iLX-507 firmware. The client establishes TLS sessions with TIDAL backend services but fails to properly validate the server certificate presented during the handshake. As a result, the application accepts certificates that are untrusted, expired, mismatched, or attacker-controlled. The flaw is classified under [CWE-295] Improper Certificate Validation. Exploitation requires the attacker to be on an adjacent network, such as a shared Wi-Fi hotspot or a rogue access point that the head unit connects to. Because the head unit runs the affected component with elevated privileges, a successful man-in-the-middle attack can be combined with downstream parsing or update flaws to reach arbitrary code execution as root.

Root Cause

The TIDAL client does not enforce strict validation of the X.509 certificate chain returned by the streaming endpoint. Typical failure modes for this class of issue include disabled hostname verification, acceptance of self-signed certificates, missing pinning, or trust managers that approve all chains. Any of these conditions removes the cryptographic guarantee that the device is communicating with a legitimate TIDAL server.

Attack Vector

An attacker positioned on the same network segment as the vehicle, such as a tethered phone hotspot or roadside Wi-Fi, intercepts traffic from the head unit to TIDAL infrastructure. The attacker presents a forged TLS certificate and proxies or rewrites application traffic. Because the iLX-507 accepts the certificate, the attacker can substitute server responses, deliver malicious media metadata, or stage payloads that target additional parsing bugs in the application. The advisory notes that the certificate validation flaw is most impactful when chained with secondary vulnerabilities to achieve root code execution.

No public proof-of-concept code has been released. See the Zero Day Initiative Advisory ZDI-25-765 for vendor coordination details.

Detection Methods for CVE-2025-8476

Indicators of Compromise

TLS sessions from the iLX-507 to TIDAL endpoints terminating at unexpected IP addresses or autonomous systems.
Unexpected certificate authorities or self-signed certificates observed in passive TLS captures of head unit traffic.
Outbound connections from the head unit to non-TIDAL infrastructure following use of the streaming application.

Detection Strategies

Capture and inspect TLS handshakes from the vehicle network using a passive tap or mirrored Wi-Fi monitor to flag certificate chains not issued by TIDAL's expected CAs.
Compare the Server Name Indication and certificate Subject Alternative Names against an allowlist of legitimate TIDAL hostnames.
Monitor for repeated TLS renegotiations or downgrade attempts near the vehicle, which can indicate active interception attempts.

Monitoring Recommendations

Log DHCP and Wi-Fi association events from the head unit to detect connections to untrusted or unknown access points.
Alert on rogue access points broadcasting SSIDs that match commonly used vehicle or mobile hotspot names.
Retain network captures from diagnostic ports during service visits and review them for anomalous certificate exchanges.

How to Mitigate CVE-2025-8476

Immediate Actions Required

Apply the firmware update from Alps Alpine once it is published for the iLX-507 platform.
Avoid connecting the head unit to untrusted Wi-Fi networks, including open public hotspots, until patched firmware is installed.
Disable or avoid launching the TIDAL application on affected devices if a patch is not yet available.

Patch Information

Alps Alpine has not published a public vendor advisory URL at the time of NVD entry. Refer to the Zero Day Initiative Advisory ZDI-25-765 and the Alps Alpine support portal for firmware availability beyond version 6.0.000.

Workarounds

Restrict the head unit to trusted cellular tethering from a known device rather than open Wi-Fi networks.
Disable automatic Wi-Fi association and remove saved open networks from the iLX-507 configuration.
Refrain from using the TIDAL streaming application until the vendor confirms the certificate validation fix is deployed.

bash

# Operator guidance, not a code patch
# 1. Forget all open/public Wi-Fi networks saved on the head unit
# 2. Disable auto-join for unknown SSIDs in the iLX-507 network settings
# 3. Check firmware version via Settings > System > Version
#    and update any build at or below 6.0.000 when Alps Alpine releases a fix