CVE-2019-5747

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.

• CWE-125
• CWE-125

• 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

Published

Jan 9, 2019

Last Modified

Jun 17, 2026

Status

Modified

• How Strix found a critical auth bypass in etcdStrix autonomously discovered a critical authentication bypass in etcd, later designated CVE-2026-33413.
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