CVE-2021-20505: IBM Powervm Hypervisor

Medium severity, CVSS 4.4. EPSS: 0.5% chance of exploitation in the next 30 days.

The PowerVM Logical Partition Mobility(LPM) (PowerVM Hypervisor FW920, FW930, FW940, and FW950) encryption key exchange protocol can be compromised. If an attacker has the ability to capture encrypted LPM network traffic and is able to gain service access to the FSP they can use this information to perform a series of PowerVM service procedures to decrypt the captured migration traffic IBM X-Force ID: 198232

Affected products

• IBM Powervm Hypervisor: version fw920 only; version fw930 only; version fw940 only; version fw950 only

Published 2021-07-29. Last modified 2026-06-17.