Is CVE-2018-18056 actively exploited?

No active exploitation of CVE-2018-18056 has been confirmed so far. Continue monitoring, as exploit status can change.

Can CVE-2018-18056 be exploited remotely?

No. CVE-2018-18056 requires physical access to exploit.

What is the CVSS score of CVE-2018-18056?

CVE-2018-18056 has a CVSS score of 4.6 (MEDIUM).

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MEDIUM

CVE-2018-18056

CWE-200Published: August 20, 2019· Updated: Jun 17, 2026

4.6

CVSS v3.1

Official Description

An issue was discovered in the Texas Instruments (TI) TM4C, MSP432E and MSP432P microcontroller series. The eXecute-Only-Memory (XOM) implementation prevents code read-outs on protected memory by generating bus faults. However, single-stepping and using breakpoints is allowed in XOM-protected flash memory. As a consequence, it is possible to execute single instructions with arbitrary system states (e.g., registers, status flags, and SRAM content) and observe the state changes produced by the unknown instruction. An attacker could exploit this vulnerability by executing protected and unknown instructions with specific system states and observing the state changes. Based on the gathered information, it is possible to reverse-engineer the executed instructions. The processor acts as a kind of "instruction oracle."

NVD Source

Technical Analysis

CVE-2018-18056 requires local access, meaning attackers must already have a foothold on the target system.

The vulnerability requires no privileges and no user interaction, making it a prime target for automated exploitation campaigns and worm-like propagation.

A successful exploit results in complete confidentiality breach (data exposure), with a CVSS base score of 4.6.

From a weakness classification perspective (CWE-200): Information exposure vulnerabilities leak sensitive data to unauthorized actors.