CVE-2021-20453: IBM WebSphere Application Server

High severity, CVSS 8.2. EPSS: 2.5% chance of exploitation in the next 30 days.

IBM WebSphere Application Server 8.0, 8.5, and 9.0 is vulnerable to a XML External Entity Injection (XXE) attack when processing XML data. A remote attacker could exploit this vulnerability to expose sensitive information or consume memory resources. IBM X-Force ID: 196648.

Affected products

• IBM WebSphere Application Server: from 8.0.0.0, before 8.0.0.15 (fixed in 8.0.0.15); from 8.5.0.0, before 8.5.5.20 (fixed in 8.5.5.20); from 9.0.0.0, before 9.0.5.8 (fixed in 9.0.5.8)

Published 2021-04-20. Last modified 2026-06-17.