CVE-2021-30640: Apache Tomcat

Medium severity, CVSS 6.5. EPSS: 9.9% chance of exploitation in the next 30 days.

A vulnerability in the JNDI Realm of Apache Tomcat allows an attacker to authenticate using variations of a valid user name and/or to bypass some of the protection provided by the LockOut Realm. This issue affects Apache Tomcat 10.0.0-M1 to 10.0.5; 9.0.0.M1 to 9.0.45; 8.5.0 to 8.5.65.

Affected products

• Apache Tomcat: from 7.0.0, before 7.0.109 (fixed in 7.0.109); from 8.5.0, before 8.5.66 (fixed in 8.5.66); from 9.0.0, before 9.0.46 (fixed in 9.0.46); from 10.0.0, before 10.0.6 (fixed in 10.0.6)
• Debian Debian Linux: version 9.0 only; version 10.0 only; version 11.0 only
• Oracle Communications Cloud Native Core Policy: version 1.14.0 only
• Oracle Communications Diameter Signaling Router: from 8.0.0, up to and including 8.5.0
• Oracle Communications Pricing Design Center: version 12.0.0.3.0 only
• Oracle Hospitality Cruise Shipboard Property Management System: version 20.1.0 only
• Oracle Tekelec Platform Distribution: from 7.4.0, up to and including 7.7.1

Published 2021-07-12. Last modified 2026-10-08.