CVE-2019-5747

Severity: high (CVSS 7.5 v3.1)
Exploited in the wild: not listed in CISA KEV
EPSS: 4.7% probability of exploitation in the next 30 days
Public exploit or detection template: yes
Published: 2019-01-09 · updated 2026-06-17
Weakness: CWE-125

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.

Affected products

busybox: through 1.30.0
Canonical Ubuntu Linux: 14.04, 16.04, 18.04, 18.10

References

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
https://git.busybox.net/busybox/commit/?id=74d9f1ba37010face4bd1449df4d60dd84450b06
https://seclists.org/bugtraq/2019/Sep/7
https://usn.ubuntu.com/3935-1/
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
https://git.busybox.net/busybox/commit/?id=74d9f1ba37010face4bd1449df4d60dd84450b06
https://seclists.org/bugtraq/2019/Sep/7
https://usn.ubuntu.com/3935-1/

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