CVE-2020-11996

HIGH

Apache Tomcat <10.0.0-M6, <9.0.36, <8.5.56 - DoS

Title source: llm

Description

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.

Exploits (1)

nomisec WORKING POC 5 stars
by rusakovichma · poc
https://github.com/rusakovichma/tomcat-embed-core-9.0.31-CVE-2020-11996

References (24)

... and 4 more

Scores

CVSS v3 7.5
EPSS 0.4512
EPSS Percentile 97.6%
Attack Vector NETWORK
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

Details

Status published
Products (16)
apache/tomcat 9.0.0 milestone1 (27 CPE variants)
apache/tomcat 10.0.0 milestone1 (5 CPE variants)
apache/tomcat 8.5.0 - 8.5.55
canonical/ubuntu_linux 20.04
debian/debian_linux 9.0
debian/debian_linux 10.0
netapp/oncommand_system_manager 3.0
netapp/oncommand_system_manager 3.1.3
opensuse/leap 15.1
opensuse/leap 15.2
... and 6 more
Published Jun 26, 2020
Tracked Since Feb 18, 2026