CVE-2021-25329: Apache Tomcat

High severity, CVSS 7.0. EPSS: 9.5% chance of exploitation in the next 30 days.

The fix for CVE-2020-9484 was incomplete. When using Apache Tomcat 10.0.0-M1 to 10.0.0, 9.0.0.M1 to 9.0.41, 8.5.0 to 8.5.61 or 7.0.0. to 7.0.107 with a configuration edge case that was highly unlikely to be used, the Tomcat instance was still vulnerable to CVE-2020-9494. Note that both the previously published prerequisites for CVE-2020-9484 and the previously published mitigations for CVE-2020-9484 also apply to this issue.

Affected products

Apache Tomcat: from 7.0.0, up to and including 7.0.107; from 8.5.0, up to and including 8.5.61; from 9.0.0, up to and including 9.0.41; version 9.0.0 only; version 10.0.0 only
Debian Debian Linux: version 9.0 only; version 10.0 only
Oracle Agile Product Lifecycle Management: version 9.3.3 only; version 9.3.6 only
Oracle Communications Cloud Native Core Policy: version 1.14.0 only
Oracle Communications Cloud Native Core Security Edge Protection Proxy: version 1.6.0 only
Oracle Communications Instant Messaging Server: version 10.0.1.5.0 only
Oracle Database: version 12.2.0.1 only; version 19c only; version 21c only
Oracle Graph Server And Client: before 21.3.0 (fixed in 21.3.0)
Oracle Instantis Enterprisetrack: version 17.1 only; version 17.2 only; version 17.3 only
Oracle Managed File Transfer: version 12.2.1.3.0 only; version 12.2.1.4.0 only
Oracle MySQL Enterprise Monitor: up to and including 8.0.23
Oracle Siebel UI Framework: before 21.9 (fixed in 21.9); version 21.9 only

Published 2021-03-01. Last modified 2026-10-08.