CVE-2018-18558: Espressif Esp-Idf

Medium severity, CVSS 6.4. EPSS: 0.4% chance of exploitation in the next 30 days.

An issue was discovered in Espressif ESP-IDF 2.x and 3.x before 3.0.6 and 3.1.x before 3.1.1. Insufficient validation of input data in the 2nd stage bootloader allows a physically proximate attacker to bypass secure boot checks and execute arbitrary code, by crafting an application binary that overwrites a bootloader code segment in process_segment in components/bootloader_support/src/esp_image_format.c. The attack is effective when the flash encryption feature is not enabled, or if the attacker finds a different vulnerability that allows them to write this binary to flash memory.

Affected products

• Espressif Esp-Idf: from 2.0, before 3.0.6 (fixed in 3.0.6); from 3.1, up to and including 3.1.1

Published 2019-05-13. Last modified 2026-06-17.