CVE-2020-11996
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.
- CVSS 3.1
- 7.5
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H - EPSS
- 27% chance of exploitation in the next 30 days; higher than 98% of CVEs (scores of 2026-10-25)
- Published
- Modified
- Record from
- the NVD, synced
Affected
- apache:tomcat
- canonical:ubuntu_linux
- debian:debian_linux
- netapp:oncommand_system_manager
- opensuse:leap
- oracle:mysql_enterprise_monitor
- oracle:siebel_ui_framework
- oracle:workload_manager
Packages (OSV)
| Advisory | Ecosystem | Package | Affected | Fixed in |
|---|---|---|---|---|
| GHSA-53hp-jpwq-2jgq | Maven | org.apache.tomcat:tomcat | >=10.0.0-M1 <10.0.0-M5 | 10.0.0-M5 |
| GHSA-53hp-jpwq-2jgq | Maven | org.apache.tomcat:tomcat | >=9.0.0.M1 <9.0.35 | 9.0.35 |
| GHSA-53hp-jpwq-2jgq | Maven | org.apache.tomcat:tomcat | >=8.5.0 <8.5.55 | 8.5.55 |
| GHSA-53hp-jpwq-2jgq | Maven | org.apache.tomcat.embed:tomcat-embed-core | >=10.0.0-M1 <10.0.0-M5 | 10.0.0-M5 |
| GHSA-53hp-jpwq-2jgq | Maven | org.apache.tomcat.embed:tomcat-embed-core | >=9.0.0.M1 <9.0.35 | 9.0.35 |
| GHSA-53hp-jpwq-2jgq | Maven | org.apache.tomcat.embed:tomcat-embed-core | >=8.5.0 <8.5.55 | 8.5.55 |
References
- http://lists.opensuse.org/opensuse-security-announce/2020-07/msg00064.html
- http://lists.opensuse.org/opensuse-security-announce/2020-07/msg00072.html
- https://lists.apache.org/thread.html/r2529016c311ce9485e6f173446d469600fdfbb94dccadfcd9dfdac79%40%3Cusers.tomcat.apache.org%3E
- https://lists.apache.org/thread.html/r3ea96d8f36dd404acce83df8aeb22a9e807d6c13ca9c5dec72f872cd%40%3Cnotifications.ofbiz.apache.org%3E
- https://lists.apache.org/thread.html/r5541ef6b6b68b49f76fc4c45695940116da2bcbe0312ef204a00a2e0%40%3Cannounce.tomcat.apache.org%3E