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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
tomcat8
Launchpad, Ubuntu, Debian
bionic Needs triage

eoan Does not exist

focal Does not exist

groovy Does not exist

hirsute Does not exist

impish Does not exist

jammy Does not exist

kinetic Does not exist

precise Does not exist

trusty Does not exist

upstream Needs triage

xenial Not vulnerable
(code not present)
tomcat9
Launchpad, Ubuntu, Debian
bionic Needs triage

eoan Ignored
(reached end-of-life)
focal
Released (9.0.31-1ubuntu0.1)
groovy Not vulnerable
(9.0.36-1)
hirsute Not vulnerable
(9.0.36-1)
impish Not vulnerable
(9.0.36-1)
jammy Not vulnerable
(9.0.36-1)
kinetic Not vulnerable
(9.0.36-1)
precise Does not exist

trusty Does not exist

upstream
Released (9.0.36-1)
xenial 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