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Vulnerability record · CVE-2018-20679 · published 9 January 2019

CVE-2018-20679: Busybox out-of-bounds read vulnerability

Busybox · Busybox

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.

7.5 CVSS 3.1 High EPSS 7.7% · top 5.6% CWE-125 · Out-of-bounds read
7.5CVSS 3.1 base score, v2 5.0
7.7%EPSS exploitation probability, 30 days
NoNot in CISA KEV
2Affected product versions listed by NVD
14References, 2 tagged exploit
17 Jun 2026Last modified by NVD

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.

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N

Affected products

2 vulnerable configurations from NVD's CPE data, grouped by vendor and product.

References

LinkTags
http://packetstormsecurity.com/files/154361/Cisco-Device-Hardcoded-Credentials-GNU-glibc-BusyBox.html
http://seclists.org/fulldisclosure/2019/Sep/7
https://bugs.busybox.net/show_bug.cgi?id=11506 ExploitIssue TrackingThird Party Advisory
https://busybox.net/news.html Release NotesThird Party Advisory
https://git.busybox.net/busybox/commit/?id=6d3b4bb24da9a07c263f3c1acf8df85382ff562c PatchThird Party Advisory
https://seclists.org/bugtraq/2019/Sep/7
https://usn.ubuntu.com/3935-1/ Third Party Advisory
http://packetstormsecurity.com/files/154361/Cisco-Device-Hardcoded-Credentials-GNU-glibc-BusyBox.html
http://seclists.org/fulldisclosure/2019/Sep/7
https://bugs.busybox.net/show_bug.cgi?id=11506 ExploitIssue TrackingThird Party Advisory
https://busybox.net/news.html Release NotesThird Party Advisory
https://git.busybox.net/busybox/commit/?id=6d3b4bb24da9a07c263f3c1acf8df85382ff562c PatchThird Party Advisory
https://seclists.org/bugtraq/2019/Sep/7
https://usn.ubuntu.com/3935-1/ Third Party Advisory

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Source: NIST National Vulnerability Database (record CVE-2018-20679), CISA KEV, FIRST EPSS (scores of 2026-09-26). This page is refreshed as NVD updates the record.