// For flags

CVE-2023-28909

Integer Overflow Leading to MTU Bypass

Severity Score

8.0
*CVSS v3.1

Exploit Likelihood

*EPSS

Affected Versions

*CPE

Public Exploits

0
*Multiple Sources

Exploited in Wild

-
*KEV

Decision

-
*SSVC
Descriptions

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.

*Credits: Mikhail Evdokimov from PCA Cyber Security (PCAutomotive)
CVSS Scores
Attack Vector
Adjacent
Attack Complexity
Low
Privileges Required
None
User Interaction
Required
Scope
Unchanged
Confidentiality
High
Integrity
High
Availability
High
* Common Vulnerability Scoring System
SSVC
  • Decision:-
Exploitation
-
Automatable
-
Tech. Impact
-
* Organization's Worst-case Scenario
Timeline
  • 2023-03-27 CVE Reserved
  • 2025-06-28 CVE Published
  • 2025-06-28 CVE Updated
  • ---------- EPSS Updated
  • ---------- Exploited in Wild
  • ---------- KEV Due Date
  • ---------- First Exploit
CWE
  • CWE-190: Integer Overflow or Wraparound
CAPEC
  • CAPEC-92: Forced Integer Overflow
Affected Vendors, Products, and Versions
Vendor Product Version Other Status
Vendor Product Version Other Status <-- --> Vendor Product Version Other Status
Preh Car Connect GmbH (JOYNEXT GmbH)
Search vendor "Preh Car Connect GmbH (JOYNEXT GmbH)"
 Volkswagen MIB3 Infotainment System MIB3 OI MQB
Search vendor "Preh Car Connect GmbH (JOYNEXT GmbH)" for product "Volkswagen MIB3 Infotainment System MIB3 OI MQB"
 <= 0304
Search vendor "Preh Car Connect GmbH (JOYNEXT GmbH)" for product "Volkswagen MIB3 Infotainment System MIB3 OI MQB" and version " <= 0304"
en
Affected