# CVE-2018-20679: busybox: An issue was discovered in BusyBox before 1.30.0

CVE-2018-20679 is fixed in 6 products on 1 platform, first by busybox 1:1.27.2-2ubuntu3.2, released January 8, 2019. It is not reported as exploited. Patch Radar priority: Routine.

- Web page: https://patchblox.com/security/cve/CVE-2018-20679
- Priority: Routine
- CVSS: n/a (Low)
- EPSS: 0.0769
- CISA KEV: not listed
- Exploited (vendor report): no
- Publicly disclosed: no
- Published: Jan 8, 2019

## Description

An issue was discovered in BusyBox before 1.30.0. An out of bounds read in udhcp components (consumed by the DHCP server, client, and relay) allows a remote attacker to leak sensitive information from the stack by sending a crafted DHCP message. This is related to verification in udhcp_get_option() in networking/udhcp/common.c that 4-byte options are indeed 4 bytes.

## Where it's fixed

| Platform | Product | Fixed in | Fix | Released |
|---|---|---|---|---|
| Linux | busybox Ubuntu 18.04.6 LTS (bionic) | 1:1.27.2-2ubuntu3.2 | [busybox 1:1.27.2-2ubuntu3.2](https://patchblox.com/security/data/fix/linux/ubuntu-bionic-busybox-1-1.27.2-2ubuntu3.2.md) | Jan 8, 2019 |
| Linux | busybox-initramfs Ubuntu 18.04.6 LTS (bionic) | 1:1.27.2-2ubuntu3.2 | [busybox-initramfs 1:1.27.2-2ubuntu3.2](https://patchblox.com/security/data/fix/linux/ubuntu-bionic-busybox-initramfs-1-1.27.2-2ubuntu3.2.md) | Jan 8, 2019 |
| Linux | busybox-static Ubuntu 18.04.6 LTS (bionic) | 1:1.27.2-2ubuntu3.2 | [busybox-static 1:1.27.2-2ubuntu3.2](https://patchblox.com/security/data/fix/linux/ubuntu-bionic-busybox-static-1-1.27.2-2ubuntu3.2.md) | Jan 8, 2019 |
| Linux | busybox-syslogd Ubuntu 18.04.6 LTS (bionic) | 1:1.27.2-2ubuntu3.2 | [busybox-syslogd 1:1.27.2-2ubuntu3.2](https://patchblox.com/security/data/fix/linux/ubuntu-bionic-busybox-syslogd-1-1.27.2-2ubuntu3.2.md) | Jan 8, 2019 |
| Linux | udhcpc Ubuntu 18.04.6 LTS (bionic) | 1:1.27.2-2ubuntu3.2 | [udhcpc 1:1.27.2-2ubuntu3.2](https://patchblox.com/security/data/fix/linux/ubuntu-bionic-udhcpc-1-1.27.2-2ubuntu3.2.md) | Jan 8, 2019 |
| Linux | udhcpd Ubuntu 18.04.6 LTS (bionic) | 1:1.27.2-2ubuntu3.2 | [udhcpd 1:1.27.2-2ubuntu3.2](https://patchblox.com/security/data/fix/linux/ubuntu-bionic-udhcpd-1-1.27.2-2ubuntu3.2.md) | Jan 8, 2019 |

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Data as of 2026-11-07T18:46:35Z UTC. Source: Patchblox Patch Radar (https://patchblox.com/security/patch-radar). Patchblox finds out-of-date software on Windows, macOS and Linux and updates it through release rings: https://patchblox.com/demo

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