Fixed in Apache Tomcat 10.1.0-M14

Note: The issue below was fixed in Apache Tomcat 10.1.0-M13 but the release vote for the 10.1.0-M13 release candidate did not pass. Therefore, although users must download 10.1.0-M14 to obtain a version that includes a fix for these issues, version 10.1.0-M13 is not included in the list of affect...

Apache Tomcat 8.x < 8.5.78 Spring4Shell CVE-2021-43980

The version of Apache Tomcat installed on the remote host is 8.x prior to 8.5.78. - The simplified implementation of blocking reads and writes introduced in Tomcat 10 and back-ported to Tomcat 9.0.47 onwards exposed a long standing but extremely hard to trigger concurrency bug in Apache Tomcat...

Fixed in Apache Tomcat 10.0.20

Note: The issue below was fixed in Apache Tomcat 10.0.19 but the release vote for the 10.0.19 release candidate did not pass. Therefore, although users must download 10.0.20 to obtain a version that includes a fix for these issues, version 10.0.19 is not included in the list of affected versions...

Apache Tomcat 9.0.0.M1 < 9.0.62 Spring4Shell CVE-2021-43980

The version of Apache Tomcat installed on the remote host is 9.x prior to 9.0.62. - The simplified implementation of blocking reads and writes introduced in Tomcat 10 and back-ported to Tomcat 9.0.47 onwards exposed a long standing but extremely hard to trigger concurrency bug in Apache Tomcat...