CVE-2025-2764 Overview
CVE-2025-2764 is an improper cryptographic signature verification vulnerability [CWE-347] in the CarlinKit CPC200-CCPA wireless CarPlay adapter. The flaw resides in the update.cgi component that handles firmware update packages. Network-adjacent attackers can bypass the existing authentication mechanism and deliver unsigned update packages to the device. Successful exploitation results in arbitrary code execution as root. The vulnerability was reported through the Zero Day Initiative as ZDI-CAN-24355 and affects the CarlinKit Autokit software running on CPC200-CCPA hardware.
Critical Impact
Attackers on the adjacent network can execute arbitrary code with root privileges on affected CarlinKit CPC200-CCPA devices by uploading a malicious firmware update.
Affected Products
- CarlinKit CPC200-CCPA (hardware)
- CarlinKit Autokit 2024.01.19.1541
- Deployments using the update.cgi firmware update interface
Discovery Timeline
- 2025-04-23 - CVE-2025-2764 published to the National Vulnerability Database
- 2026-06-17 - Last updated in NVD database
Technical Details for CVE-2025-2764
Vulnerability Analysis
The CarlinKit CPC200-CCPA exposes an update endpoint at update.cgi that accepts firmware packages for installation. The endpoint fails to properly verify the cryptographic signature of supplied update packages before applying them. An attacker who reaches the adapter over the adjacent network (for example, its Wi-Fi interface) can submit a crafted update package that the device installs as trusted firmware.
Authentication is nominally required to reach update.cgi, but the existing authentication mechanism can be bypassed. The combination of the authentication bypass and missing signature validation allows an unauthenticated adjacent attacker to load attacker-controlled code. Update handlers on embedded automotive accessories typically run with elevated privileges, and in this case exploitation yields code execution in the context of root.
Root Cause
The root cause is missing or improper verification of the cryptographic signature on update payloads processed by update.cgi. The CGI handler treats supplied packages as authentic without confirming that a valid vendor signature covers the package contents. This is a classic instance of [CWE-347: Improper Verification of Cryptographic Signature].
Attack Vector
Exploitation requires network adjacency to the device, such as association with the adapter's Wi-Fi network. The attacker bypasses the built-in authentication on the web interface and issues a request to update.cgi containing a malicious firmware image. The device unpacks and executes the payload, giving the attacker persistent root-level control over the CarPlay adapter, including the ability to intercept or modify data exchanged with the paired vehicle head unit and mobile device.
No public proof-of-concept exploit code is available. Technical details are documented in the Zero Day Initiative Advisory ZDI-25-178.
Detection Methods for CVE-2025-2764
Indicators of Compromise
- HTTP POST requests to update.cgi on the adapter's management interface from unexpected client MAC addresses or Wi-Fi clients.
- Firmware version strings or build timestamps on the device that do not match a known vendor-signed release.
- New or modified persistent processes, services, or startup scripts running as root on the adapter after a firmware update event.
Detection Strategies
- Monitor wireless traffic to and from the CPC200-CCPA for administrative requests originating from clients other than the paired mobile device.
- Baseline expected firmware versions across a fleet of adapters and alert on version drift or unsigned image indicators.
- Inspect vehicle infotainment logs where available for repeated pairing attempts or unusual USB/Wi-Fi device enumeration tied to the adapter.
Monitoring Recommendations
- Log and review any access to the adapter's HTTP management interface, especially requests to update.cgi.
- Track failed and successful authentications against the adapter and flag any activity that succeeds without a preceding credential exchange consistent with the documented flow.
- Where the adapter is used in fleet or commercial vehicles, integrate device telemetry into a centralized log platform for correlation across vehicles.
How to Mitigate CVE-2025-2764
Immediate Actions Required
- Restrict physical and wireless access to the CPC200-CCPA to trusted users only, and change any default Wi-Fi credentials on the adapter.
- Power off or disconnect the adapter when it is not in active use to eliminate the adjacent network attack surface.
- Inventory affected devices, including the carlinkit autokit 2024.01.19.1541 build, and prioritize replacement or firmware refresh once a vendor-signed patch is available.
Patch Information
At the time of this writing, no vendor advisory or patched firmware release has been published for CVE-2025-2764. Refer to the Zero Day Initiative Advisory ZDI-25-178 for the authoritative disclosure and monitor CarlinKit communications for a firmware update that enforces cryptographic signature validation on update.cgi payloads.
Workarounds
- Avoid connecting the adapter's Wi-Fi network in untrusted environments such as public parking areas or shared garages where unknown clients may associate.
- Do not share the adapter's Wi-Fi password beyond the primary driver, and rotate the password if it has been exposed.
- If the adapter supports disabling remote update or web management functionality, disable it until a signed firmware release is available.
Disclaimer: This content was generated using AI. While we strive for accuracy, please verify critical information with official sources.
