CVE-2019-6155: IBM Bladecenter HS23 Firmware

High severity, CVSS 7.5. EPSS: 0.8% chance of exploitation in the next 30 days.

A potential vulnerability was found in an SMI handler in various BIOS versions of certain legacy IBM System x and IBM BladeCenter systems that could lead to denial of service.

Affected products

• IBM Bladecenter HS23 Firmware: before 3.0.0 (fixed in 3.0.0)
• IBM System x3530 m4 Firmware: before 3.20 (fixed in 3.20)
• IBM System x3630 m4 Firmware: before 3.20 (fixed in 3.20)
• IBM System x3650 m4 Hd Firmware: before 2.40 (fixed in 2.40)

Published 2019-04-22. Last modified 2026-06-17.