CVE-2018-20679
CVSS v3
7.5
HIGH
EPSS Score
7.7 %
exploit probability, as of 2026-10-05
CISA KEV
No
known exploited
Exploitation
—
SSVC status
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.
Technical details
- Published
- 2019-01-09
Frequently asked questions
What is CVE-2018-20679?
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.
Is CVE-2018-20679 actively exploited?
Active exploitation of CVE-2018-20679 has not been confirmed. Its EPSS score was 7.7% on 2026-10-05, the estimated probability of exploitation in the next 30 days.
What is the CVSS score for CVE-2018-20679?
CVE-2018-20679 has a CVSS v3 base score of 7.5 (HIGH severity).
Is CVE-2018-20679 affecting your environment?
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