CVE-2020-4450: IBM WebSphere Application Server

Critical severity, CVSS 9.8. EPSS: 34.2% chance of exploitation in the next 30 days.

IBM WebSphere Application Server 8.5 and 9.0 traditional could allow a remote attacker to execute arbitrary code on the system with a specially-crafted sequence of serialized objects. IBM X-Force ID: 181231.

Affected products

• IBM WebSphere Application Server: from 8.5.0.0, before 8.5.5.18 (fixed in 8.5.5.18); from 9.0.0.0, before 9.0.5.5 (fixed in 9.0.5.5)

Published 2020-06-05. Last modified 2026-06-17.