CVE-2018-18439

Severity: critical (CVSS 9.8 v3.1)
Exploited in the wild: not listed in CISA KEV
EPSS: 2.0% probability of exploitation in the next 30 days
Public exploit or detection template: yes
Published: 2018-11-20 · updated 2026-06-17
Weakness: CWE-119

Description

DENX U-Boot through 2018.09-rc1 has a remotely exploitable buffer overflow via a malicious TFTP server because TFTP traffic is mishandled. Also, local exploitation can occur via a crafted kernel image.

Affected products

u-boot: before 2018.09; 2018.09-rc1 — fixed in 2018.09

How to fix

Upgrade to a fixed version: u-boot 2018.09. Check the vendor advisory for mitigations.

References

http://www.openwall.com/lists/oss-security/2018/11/02/2
http://www.openwall.com/lists/oss-security/2018/11/02/2

Get alerted when CVE-2018-18439 or the next vulnerability affects your stack