CVE-2021-29842: IBM WebSphere Application Server

Medium severity, CVSS 5.3. EPSS: 1.3% chance of exploitation in the next 30 days.

IBM WebSphere Application Server 7.0, 8.0, 8.5, 9.0 and Liberty 17.0.0.3 through 21.0.0.9 could allow a remote user to enumerate usernames due to a difference of responses from valid and invalid login attempts. IBM X-Force ID: 205202.

Affected products

• IBM WebSphere Application Server: from 7.0.0.0, up to and including 7.0.0.45; from 8.0.0.0, up to and including 8.0.0.15; from 8.5, up to and including 8.5.5.20; from 9.0.0.0, up to and including 9.0.5.9; from 17.0.0.3, up to and including 21.0.0.9

Published 2021-09-16. Last modified 2026-06-17.