Disclosure summary
A specially crafted sequence of HTTP/2 requests sent to Apache Tomcat 10.0.0-M1 to 10.0.0-M5, 9.0.0.M1 to 9.0.35 and 8.5.0 to 8.5.55 could trigger high CPU usage for several seconds. If a sufficient number of such requests were made on concurrent HTTP/2 connections, the server could become unresponsive.
Source-reported weakness categories
NVD-CWE-noinfo
Source-specific records & product guidance
Sources retain their own attribution and scoring. Follow the original record to confirm affected versions, fixed releases, and configuration conditions.
NIST National Vulnerability Database · NVD-CVE-2020-11996
Open original source · Updated Oct 08, 2026
Only CPE matches marked vulnerable=true are indexed. AND/OR platform conditions must be checked in the original NVD record.
| Vendor | Product / association | Version / bounds |
|---|---|---|
| apache | tomcat | * {"versionStartIncluding":"9.0.0","versionEndIncluding":"9.0.35"} |
| apache | tomcat | 9.0.0 |
| apache | tomcat | 9.0.0 |
| apache | tomcat | 9.0.0 |
| apache | tomcat | 9.0.0 |
| apache | tomcat | 9.0.0 |
| apache | tomcat | 9.0.0 |
| apache | tomcat | 9.0.0 |
| apache | tomcat | 9.0.0 |
| apache | tomcat | 9.0.0 |
| apache | tomcat | 9.0.0 |
| apache | tomcat | 9.0.0 |
| apache | tomcat | 9.0.0 |
| apache | tomcat | 9.0.0 |
| apache | tomcat | 9.0.0 |
| apache | tomcat | 9.0.0 |
| apache | tomcat | 9.0.0 |
| apache | tomcat | 9.0.0 |
| apache | tomcat | 9.0.0 |
| apache | tomcat | 9.0.0 |
| apache | tomcat | 9.0.0 |
| apache | tomcat | 9.0.0 |
| apache | tomcat | 9.0.0 |
| apache | tomcat | 9.0.0 |
| apache | tomcat | 9.0.0 |
| apache | tomcat | 9.0.0 |
| apache | tomcat | 9.0.0 |
| apache | tomcat | 9.0.0 |
| apache | tomcat | 10.0.0 |
| apache | tomcat | 10.0.0 |
| apache | tomcat | 10.0.0 |
| apache | tomcat | 10.0.0 |
| apache | tomcat | 10.0.0 |
| canonical | ubuntu_linux | 20.04 |
| oracle | mysql_enterprise_monitor | * {"versionEndIncluding":"8.0.21"} |
| oracle | siebel_ui_framework | * {"versionEndIncluding":"20.12"} |
| oracle | workload_manager | 12.2.0.1 |
| oracle | workload_manager | 18c |
| oracle | workload_manager | 19c |
| opensuse | leap | 15.1 |
| opensuse | leap | 15.2 |
| debian | debian_linux | 9.0 |
| debian | debian_linux | 10.0 |
| netapp | oncommand_system_manager | 3.0 |
| netapp | oncommand_system_manager | 3.1.3 |
Original records & references
- NIST NVD record
- CVE Program record
- lists.apache.org
- lists.apache.org
- lists.apache.org — Mailing List, Vendor Advisory
- lists.apache.org
- lists.apache.org
- lists.apache.org
- lists.apache.org
- lists.apache.org
- lists.apache.org
- lists.apache.org
- lists.apache.org
- lists.apache.org
- lists.apache.org
- lists.apache.org
- lists.apache.org
- lists.apache.org
- lists.debian.org — Mailing List, Third Party Advisory
- security.netapp.com — Third Party Advisory
- usn.ubuntu.com — Third Party Advisory
- www.debian.org — Third Party Advisory
- www.oracle.com — Third Party Advisory
- www.oracle.com — Third Party Advisory
- lists.apache.org
- lists.apache.org
- lists.apache.org — Mailing List, Vendor Advisory
- lists.apache.org
- lists.apache.org
- lists.apache.org
- lists.apache.org
- lists.apache.org
- lists.apache.org
- lists.apache.org
- lists.apache.org
- lists.apache.org
- lists.apache.org
- lists.apache.org
- lists.apache.org
- lists.apache.org
- lists.debian.org — Mailing List, Third Party Advisory
- security.netapp.com — Third Party Advisory
- usn.ubuntu.com — Third Party Advisory
- www.debian.org — Third Party Advisory
- www.oracle.com — Third Party Advisory
- www.oracle.com — Third Party Advisory
PUBLISHED 2020-06-26T13:15:10-04:00
MODIFIED 2026-10-08T18:16:56-04:00
INGESTED 2026-10-10T20:50:19-04:00