CVE-2019-5747

Name: CVE-2019-5747
Creator: NVD / NIST
Published: 2019-01-09T16:29:00.353+00:00
License: https://creativecommons.org/publicdomain/zero/1.0/

HIGHCVSS 7.5/10EPSS 4.65%

Last modified Jun 17, 2026

CVE-2019-5747 is a high-severity vulnerability rated 7.5/10 on the CVSS scale. 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. EPSS estimates a 4.65% chance of exploitation in the next 30 days.

Description

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.

Metrics

CVSS 3.1

7.5/10

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

EPSS Probability

4.65%

90.6th percentile

Probability of exploitation in the next 30 days. Learn more

Weakness Enumeration

Affected Software

Vendor	Product	Versions
Busybox	Busybox	<= 1.30.0
Canonical	Ubuntu Linux	14.04
Canonical	Ubuntu Linux	16.04
Canonical	Ubuntu Linux	18.04
Canonical	Ubuntu Linux	18.10

References

http://packetstormsecurity.com/files/154361/Cisco-Device-Hardcoded-Credentials-GNU-glibc-BusyBox.htmlExploit, Third Party Advisory, VDB Entry
http://seclists.org/fulldisclosure/2019/Sep/7Mailing List, Third Party Advisory
https://bugs.busybox.net/show_bug.cgi?id=11506Exploit, Issue Tracking, Third Party Advisory
https://git.busybox.net/busybox/commit/?id=74d9f1ba37010face4bd1449df4d60dd84450b06Patch, Third Party Advisory
https://seclists.org/bugtraq/2019/Sep/7Mailing List, Third Party Advisory
https://usn.ubuntu.com/3935-1/Third Party Advisory
http://packetstormsecurity.com/files/154361/Cisco-Device-Hardcoded-Credentials-GNU-glibc-BusyBox.htmlExploit, Third Party Advisory, VDB Entry
http://seclists.org/fulldisclosure/2019/Sep/7Mailing List, Third Party Advisory
https://bugs.busybox.net/show_bug.cgi?id=11506Exploit, Issue Tracking, Third Party Advisory
https://git.busybox.net/busybox/commit/?id=74d9f1ba37010face4bd1449df4d60dd84450b06Patch, Third Party Advisory
https://seclists.org/bugtraq/2019/Sep/7Mailing List, Third Party Advisory
https://usn.ubuntu.com/3935-1/Third Party Advisory

Timeline

Published: Jan 9, 2019
Last Modified: Jun 17, 2026
Status: Modified

Frequently Asked Questions

What is CVE-2019-5747?

How severe is CVE-2019-5747?

CVE-2019-5747 has a CVSS score of 7.5/10 (HIGH severity). The EPSS model estimates a 4.65% probability of exploitation in the next 30 days.

How do I fix CVE-2019-5747?

Check the vendor references and advisories linked above for patched versions and mitigation guidance. You can also run a Strix scan to test if your systems are affected.

Are you affected by CVE-2019-5747?

Run a free Strix scan to check your systems for this vulnerability.

Scan your code now

Source: NVD / NIST