CVE-2021-41079: Apache Tomcat

High severity, CVSS 7.5. EPSS: 7.2% chance of exploitation in the next 30 days.

Apache Tomcat 8.5.0 to 8.5.63, 9.0.0-M1 to 9.0.43 and 10.0.0-M1 to 10.0.2 did not properly validate incoming TLS packets. When Tomcat was configured to use NIO+OpenSSL or NIO2+OpenSSL for TLS, a specially crafted packet could be used to trigger an infinite loop resulting in a denial of service.

Affected products

• Apache Tomcat: from 8.5.0, before 8.5.64 (fixed in 8.5.64); from 9.0.0, before 9.0.44 (fixed in 9.0.44); from 10.0.0, up to and including 10.0.2
• Debian Debian Linux: version 9.0 only; version 10.0 only; version 11.0 only
• Netapp Management Services For Element Software And Netapp Hci: affected versions not specified

Published 2021-09-16. Last modified 2026-10-08.