CVE-2018-3866: Samsung Sth-Eth-250 Firmware

Critical severity, CVSS 9.9. EPSS: 1.5% chance of exploitation in the next 30 days.

An exploitable buffer overflow vulnerability exists in the samsungWifiScan handler of video-core's HTTP server of Samsung SmartThings Hub STH-ETH-250 - Firmware version 0.20.17. The video-core process incorrectly extracts fields from a user-controlled JSON payload, leading to a buffer overflow on the stack. The strcpy at [8] overflows the destination buffer, which has a size of 40 bytes. An attacker can send an arbitrarily long 'callbackUrl' value in order to exploit this vulnerability.

Affected products

• Samsung Sth-Eth-250 Firmware: version 0.20.17 only

Published 2018-08-23. Last modified 2026-06-17.