CVE-2019-5747: Busybox

High severity, CVSS 7.5. EPSS: 4.7% chance of exploitation in the next 30 days.

An issue was discovered in BusyBox through 1.30.0. An out of bounds read in udhcp components (consumed by the DHCP client, server, and/or relay) might allow a remote attacker to leak sensitive information from the stack by sending a crafted DHCP message. This is related to assurance of a 4-byte length when decoding DHCP_SUBNET. NOTE: this issue exists because of an incomplete fix for CVE-2018-20679.

Affected products

• Busybox Busybox: up to and including 1.30.0
• Canonical Ubuntu Linux: version 14.04 only; version 16.04 only; version 18.04 only; version 18.10 only

Published 2019-01-09. Last modified 2026-06-17.