CVE-2021-20354: IBM WebSphere Application Server

High severity, CVSS 7.5. EPSS: 4.1% chance of exploitation in the next 30 days.

IBM WebSphere Application Server 8.0, 8.5, and 9.0 could allow a remote attacker to traverse directories. An attacker could send a specially-crafted URL request containing "dot dot" sequences (/../) to view arbitrary files on the system. IBM X-Force ID: 194883.

Affected products

• IBM WebSphere Application Server: from 8.0.0.0, up to and including 8.0.0.15; from 8.5.0.0, up to and including 8.5.5.19; from 9.0.0.0, up to and including 9.0.5.6

Published 2021-02-18. Last modified 2026-06-17.