An h2c direct connection to Apache Tomcat 10.0.0-M1 to 10.0.0-M6, 9.0.0.M5 to 9.0.36 and 8.5.1 to 8.5.56 did not release the HTTP/1.1 processor after the upgrade to HTTP/2. If a sufficient number of such requests were made, an OutOfMemoryException could occur leading to a denial of service.
The product does not sufficiently track and release allocated memory after it has been used, which slowly consumes remaining memory.
| Name | Vendor | Start Version | End Version |
|---|---|---|---|
| Tomcat | Apache | 8.5.1 (including) | 8.5.56 (including) |
| Tomcat | Apache | 9.0.1 (including) | 9.0.36 (including) |
| Tomcat | Apache | 9.0.0-milestone10 (including) | 9.0.0-milestone10 (including) |
| Tomcat | Apache | 9.0.0-milestone11 (including) | 9.0.0-milestone11 (including) |
| Tomcat | Apache | 9.0.0-milestone12 (including) | 9.0.0-milestone12 (including) |
| Tomcat | Apache | 9.0.0-milestone13 (including) | 9.0.0-milestone13 (including) |
| Tomcat | Apache | 9.0.0-milestone14 (including) | 9.0.0-milestone14 (including) |
| Tomcat | Apache | 9.0.0-milestone15 (including) | 9.0.0-milestone15 (including) |
| Tomcat | Apache | 9.0.0-milestone16 (including) | 9.0.0-milestone16 (including) |
| Tomcat | Apache | 9.0.0-milestone17 (including) | 9.0.0-milestone17 (including) |
| Tomcat | Apache | 9.0.0-milestone18 (including) | 9.0.0-milestone18 (including) |
| Tomcat | Apache | 9.0.0-milestone19 (including) | 9.0.0-milestone19 (including) |
| Tomcat | Apache | 9.0.0-milestone20 (including) | 9.0.0-milestone20 (including) |
| Tomcat | Apache | 9.0.0-milestone21 (including) | 9.0.0-milestone21 (including) |
| Tomcat | Apache | 9.0.0-milestone22 (including) | 9.0.0-milestone22 (including) |
| Tomcat | Apache | 9.0.0-milestone23 (including) | 9.0.0-milestone23 (including) |
| Tomcat | Apache | 9.0.0-milestone24 (including) | 9.0.0-milestone24 (including) |
| Tomcat | Apache | 9.0.0-milestone25 (including) | 9.0.0-milestone25 (including) |
| Tomcat | Apache | 9.0.0-milestone26 (including) | 9.0.0-milestone26 (including) |
| Tomcat | Apache | 9.0.0-milestone27 (including) | 9.0.0-milestone27 (including) |
| Tomcat | Apache | 9.0.0-milestone5 (including) | 9.0.0-milestone5 (including) |
| Tomcat | Apache | 9.0.0-milestone6 (including) | 9.0.0-milestone6 (including) |
| Tomcat | Apache | 9.0.0-milestone7 (including) | 9.0.0-milestone7 (including) |
| Tomcat | Apache | 9.0.0-milestone8 (including) | 9.0.0-milestone8 (including) |
| Tomcat | Apache | 9.0.0-milestone9 (including) | 9.0.0-milestone9 (including) |
| Tomcat | Apache | 10.0.0-milestone1 (including) | 10.0.0-milestone1 (including) |
| Tomcat | Apache | 10.0.0-milestone2 (including) | 10.0.0-milestone2 (including) |
| Tomcat | Apache | 10.0.0-milestone3 (including) | 10.0.0-milestone3 (including) |
| Tomcat | Apache | 10.0.0-milestone4 (including) | 10.0.0-milestone4 (including) |
| Tomcat | Apache | 10.0.0-milestone5 (including) | 10.0.0-milestone5 (including) |
| Tomcat | Apache | 10.0.0-milestone6 (including) | 10.0.0-milestone6 (including) |
| Red Hat Fuse 7.9 | RedHat | tomcat | * |
| Red Hat JBoss Web Server 5.3 on RHEL 6 | RedHat | jws5-tomcat-0:9.0.30-5.redhat_6.1.el6jws | * |
| Red Hat JBoss Web Server 5.3 on RHEL 7 | RedHat | jws5-tomcat-0:9.0.30-5.redhat_6.1.el7jws | * |
| Red Hat JBoss Web Server 5.3 on RHEL 8 | RedHat | jws5-tomcat-0:9.0.30-5.redhat_6.1.el8jws | * |
| Red Hat JBoss Web Server (JWS) 5.3 | RedHat | tomcat | * |
| Red Hat Runtimes Spring Boot 2.2.6 | RedHat | tomcat | * |
| Tomcat6 | Ubuntu | precise/esm | * |
| Tomcat6 | Ubuntu | trusty | * |
| Tomcat6 | Ubuntu | xenial | * |
| Tomcat7 | Ubuntu | bionic | * |
| Tomcat7 | Ubuntu | trusty | * |
| Tomcat7 | Ubuntu | xenial | * |
| Tomcat8 | Ubuntu | bionic | * |
| Tomcat9 | Ubuntu | bionic | * |
| Tomcat9 | Ubuntu | eoan | * |
| Tomcat9 | Ubuntu | focal | * |