Out-of-bounds Read Affecting busybox package, versions <1:1.30.1-1
Threat Intelligence
The probability is the direct output of the EPSS model, and conveys an overall sense of the threat of exploitation in the wild. The percentile measures the EPSS probability relative to all known EPSS scores. Note: This data is updated daily, relying on the latest available EPSS model version. Check out the EPSS documentation for more details.
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Test your applications- Snyk IDSNYK-ECHOLATEST-BUSYBOX-18021412
- published20 Jul 2026
- disclosed9 Jan 2019
Introduced: 9 Jan 2019
CVE-2018-20679 (opens in a new tab)How to fix?
Upgrade Echo:latest busybox to version 1:1.30.1-1 or higher.
NVD Description
Note: Versions mentioned in the description apply only to the upstream busybox package and not the busybox package as distributed by Echo.
See How to fix? for Echo:latest relevant fixed versions and status.
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.
References
- https://advisory.echohq.com/cve/CVE-2018-20679
- https://www.cve.org/CVERecord?id=CVE-2018-20679
- 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://busybox.net/news.html
- https://git.busybox.net/busybox/commit/?id=6d3b4bb24da9a07c263f3c1acf8df85382ff562c
- https://seclists.org/bugtraq/2019/Sep/7
- https://usn.ubuntu.com/3935-1/