CVE-2019-18930: Western Digital My Cloud EX2 Ultra Firmware

High severity, CVSS 8.8. EPSS: 3.2% chance of exploitation in the next 30 days.

Western Digital My Cloud EX2 Ultra firmware 2.31.183 allows web users (including guest account) to remotely execute arbitrary code via a stack-based buffer overflow. There is no size verification logic in one of functions in libscheddl.so, and download_mgr.cgi makes it possible to enter large-sized f_idx inputs.

Affected products

• Western Digital My Cloud EX2 Ultra Firmware: version 2.31.183 only

Published 2019-11-13. Last modified 2026-06-17.