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CVE-2019-0199

Published: 10 April 2019

The HTTP/2 implementation in Apache Tomcat 9.0.0.M1 to 9.0.14 and 8.5.0 to 8.5.37 accepted streams with excessive numbers of SETTINGS frames and also permitted clients to keep streams open without reading/writing request/response data. By keeping streams open for requests that utilised the Servlet API's blocking I/O, clients were able to cause server-side threads to block eventually leading to thread exhaustion and a DoS.

Priority

Medium

Cvss 3 Severity Score

7.5

Score breakdown

Status

Package Release Status
tomcat9
Launchpad, Ubuntu, Debian
upstream
Released (9.0.16-1)
precise Does not exist

trusty Does not exist

xenial Does not exist

bionic Not vulnerable
(9.0.16-3~18.04.1)
cosmic Not vulnerable
(9.0.16-3~18.10)
tomcat8
Launchpad, Ubuntu, Debian
upstream
Released (8.5.38-1)
precise Does not exist

trusty Does not exist

xenial Not vulnerable
(code not present)
bionic
Released (8.5.39-1ubuntu1~18.04.1)
cosmic
Released (8.5.39-1ubuntu1~18.10)

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:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H