CVE-2023-28909 Integer Overflow Leading to MTU Bypass
An integer overflow in the Bluetooth stack allows bypassing MTU checks, leading to buffer overflows and remote code execution in the infotainment unit.
- Exploited in the wild
- Not known
- Login needed
- Not needed
- Attackable
- Local or same network only
- Victim action needed
- A user has to click or open something
- Fix
- None listed
What is CVE-2023-28909?
CVE-2023-28909 is a high-severity vulnerability in Preh Car Connect GmbH (JOYNEXT GmbH) Volkswagen MIB3 infotainment system MIB3 OI MQB, published on 28 Jun 2025. It can only be exploited from the same machine or local network, and only if a user opens a file or follows a link.
Official description
A specific flaw exists within the Bluetooth stack of the MIB3 unit. The issue results from the lack of proper validation of user-supplied data, which can result in an integer overflow when receiving fragmented HCI packets on a channel. An attacker can leverage this vulnerability to bypass the MTU check on a channel with enabled fragmentation. Consequently, this can lead to a buffer overflow in upper layer profiles, which can be used to obtain remote code execution. The vulnerability was originally discovered in Skoda Superb III car with MIB3 infotainment unit OEM part number 3V0035820. The list of affected MIB3 OEM part numbers is provided in the referenced resources.
Weakness: CWE-190
Which versions are affected by CVE-2023-28909?
How do I fix CVE-2023-28909?
No fix has been published for CVE-2023-28909 yet. Limit exposure of the affected software until one is available.
Is CVE-2023-28909 being exploited?
It is not confirmed as exploited in the wild, but public exploit code for CVE-2023-28909 exists.
Sources
Also known as GHSA-px4q-7qhm-g854.