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CVE-2020-11996

Published: 26 June 2020

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.

Notes

AuthorNote
mdeslaur
HTTP/2 support introduced in 8.5

Priority

Medium

Cvss 3 Severity Score

7.5

Score breakdown

Status

Package Release Status
tomcat9
Launchpad, Ubuntu, Debian
focal
Released (9.0.31-1ubuntu0.1)
hirsute Not vulnerable
(9.0.36-1)
jammy Not vulnerable
(9.0.36-1)
bionic Needs triage

eoan Ignored
(end of life)
groovy Not vulnerable
(9.0.36-1)
impish Not vulnerable
(9.0.36-1)
kinetic Not vulnerable
(9.0.36-1)
lunar Not vulnerable
(9.0.36-1)
trusty Does not exist

upstream
Released (9.0.36-1)
xenial Does not exist

mantic Not vulnerable
(9.0.36-1)
tomcat8
Launchpad, Ubuntu, Debian
hirsute Does not exist

jammy Does not exist

bionic Needs triage

eoan Does not exist

focal Does not exist

groovy Does not exist

impish Does not exist

kinetic Does not exist

lunar Does not exist

trusty Does not exist

upstream Needs triage

xenial Not vulnerable
(code not present)
mantic Does not exist

Severity score breakdown

Parameter Value
Base score 7.5
Attack vector Network
Attack complexity Low
Privileges required None
User interaction None
Scope Unchanged
Confidentiality None
Integrity impact None
Availability impact High
Vector CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

References