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Fencer Vulns
high 7.5

CVE-2019-0199 in the critical feed json

Apache Tomcat Denial of Service vulnerability

published 2019-04-10 7 y ago modified 2026-06-17 4 mo ago also GHSA-qcxh-w3j9-58qr , EUVD-2020-0508

cvss
7.5
version 3.0, NVD
cisa kev
Not listed
not in CISA's catalog
epss
72.9%
EPSS 72.9% chance of exploitation in 30 days, percentile 99.4%
public exploits
0
none known

Summary

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.

Patch / fix

  • maven org.apache.tomcat.embed:tomcat-embed-core 8.5.38, 9.0.16
  • maven org.apache.tomcat:tomcat-coyote 8.5.38, 9.0.16
  • tomcat9 Debian 14, Debian 13, Debian 12 9.0.16-1

debian advisories DEBIAN-CVE-2019-0199

  • tomcat8 Ubuntu 18.04 LTS 8.5.39-1ubuntu1~18.04.1

ubuntu advisories UBUNTU-CVE-2019-0199

Ubuntu security data © Canonical Ltd., from https://github.com/canonical/ubuntu-security-notices via OSV; changed: normalised to fixed package versions per release. CC BY-SA 4.0

  • jws5-ecj jboss enterprise web server 5.2 4.12.0-1.redhat_1.1.el6jws
  • jws5-ecj jboss enterprise web server 5.2 4.12.0-1.redhat_1.1.el7jws
  • jws5-ecj jboss enterprise web server 5.2 4.12.0-1.redhat_1.1.el8jws
  • jws5-tomcat jboss enterprise web server 5.2 9.0.21-10.redhat_4.1.el6jws
  • jws5-tomcat jboss enterprise web server 5.2 9.0.21-10.redhat_4.1.el7jws
  • jws5-tomcat jboss enterprise web server 5.2 9.0.21-10.redhat_4.1.el8jws
  • jws5-tomcat-lib jboss enterprise web server 5.2 9.0.21-10.redhat_4.1.el6jws
  • jws5-tomcat-lib jboss enterprise web server 5.2 9.0.21-10.redhat_4.1.el7jws

red hat advisories RHSA-2019:3929

  • tomcat SLE Module for Web and Scripting 15 SP1 9.0.21-4.5.5
  • tomcat SLES for SAP 12 SP4, SLES 12 SP4 9.0.21-3.13.2
  • tomcat SLE Module for Web and Scripting 15 9.0.21-3.27.1
  • tomcat SLE Module for Web and Scripting 15 9.0.20-3.24.2

suse advisories SUSE-SU-2019:1895-1SUSE-SU-2019:1866-1SUSE-SU-2019:1825-1SUSE-SU-2019:1693-1

  • tomcat openSUSE Tumbleweed 9.0.36-8.4
  • tomcat10 openSUSE Tumbleweed 10.1.14-1.1
  • tomcat openSUSE Leap 15.1 9.0.21-lp151.3.3.1
  • tomcat openSUSE Leap 15.0 9.0.21-lp150.2.22.1
  • tomcat openSUSE Leap 15.0 9.0.20-lp150.2.19.1

opensuse advisories openSUSE-SU-2024:11468-1openSUSE-SU-2024:13441-1openSUSE-SU-2019:1808-1openSUSE-SU-2019:1723-1openSUSE-SU-2019:1673-1

Vendor advisories

What the vendors themselves say about their products: affected, fixed or not affected, and what to do.

red hat product security vex CVE-2019-0199 updated cvss 7.5

tomcat: Apache Tomcat HTTP/2 DoS

  • Red Hat Enterprise Linux 8 pki-deps:10.6/pki-servlet-container
    affected: no fix planned “Will not fix”
  • Red Hat support for Spring Boot tomcat
    affected: no fix available
  • Red Hat JBoss Web Server 5
    fixed: vendor fix RHSA-2019:3931
  • Red Hat JBoss Web Server 5.2 for RHEL 6 Server jws5-ecj 4.12.0-1.redhat_1.1.el6jws, jws5-tomcat 9.0.21-10.redhat_4.1.el6jws, jws5-tomcat-lib 9.0.21-10.redhat_4.1.el6jws, jws5-javapackages-tools 3.4.1-5.15.11.el6jws, jws5-python-javapackages 3.4.1-5.15.11.el6jws, jws5-tomcat-native 1.2.21-34.redhat_34.el6jws, +13 more Red Hat JBoss Web Server 5.2 for RHEL 7 Server jws5-ecj 4.12.0-1.redhat_1.1.el7jws, jws5-tomcat 9.0.21-10.redhat_4.1.el7jws, jws5-tomcat-lib 9.0.21-10.redhat_4.1.el7jws, jws5-javapackages-tools 3.4.1-5.15.11.el7jws, jws5-python-javapackages 3.4.1-5.15.11.el7jws, jws5-tomcat-native 1.2.21-34.redhat_34.el7jws, +13 more Red Hat JBoss Web Server 5.2 for RHEL 8 jws5-ecj 4.12.0-1.redhat_1.1.el8jws, jws5-tomcat 9.0.21-10.redhat_4.1.el8jws, jws5-tomcat-lib 9.0.21-10.redhat_4.1.el8jws, jws5-javapackages-tools 3.4.1-5.15.11.el8jws, jws5-python-javapackages 3.4.1-5.15.11.el8jws, jws5-tomcat-native 1.2.21-34.redhat_34.el8jws, +13 more
    fixed: vendor fix RHSA-2019:3929
  • Red Hat Runtimes Spring Boot 2.1.12
    fixed: vendor fix RHSA-2020:2366
  • Red Hat BPM Suite 6 tomcat Red Hat Enterprise Linux 6 tomcat6, tomcat6-lib, tomcat6-log4j, tomcat6-javadoc, tomcat6-webapps, tomcat6-el-2.1-api, +4 more Red Hat Enterprise Linux 7 tomcat, tomcat-lib, tomcat-jsvc, tomcat-javadoc, tomcat-webapps, tomcat-el-2.2-api, +4 more Red Hat Fuse 7 tomcat Red Hat JBoss BRMS 5 jbossweb jbossweb Red Hat JBoss BRMS 6 tomcat
    +13 more products
    Red Hat JBoss Data Grid 6 jbossweb jbossweb Red Hat JBoss Data Grid 7 tomcat Red Hat JBoss Data Virtualization 6 jbossweb jbossweb Red Hat JBoss Enterprise Application Platform 5 jbossweb jbossweb Red Hat JBoss Enterprise Application Platform 6 jbossweb jbossweb Red Hat JBoss Enterprise Web Server 2 tomcat6, tomcat6-lib, tomcat6-log4j, tomcat6-javadoc, tomcat6-webapps, tomcat7 tomcat7, +6 more Red Hat JBoss Fuse 6 tomcat Red Hat JBoss Fuse Service Works 6 jbossweb jbossweb Red Hat JBoss Operations Network 3 jbossweb jbossweb Red Hat JBoss SOA Platform 5 jbossweb jbossweb Red Hat JBoss Web Server 3 tomcat7 tomcat7, tomcat8 tomcat8 Red Hat OpenShift Application Runtimes tomcat Red Hat Software Collections rh-java-common-tomcat-lib, rh-java-common-tomcat-javadoc, rh-java-common-tomcat-el-2.2-api, rh-java-common-tomcat-jsp-2.2-api, rh-java-common-tomcat-servlet-3.0-api
    not affected: vulnerable code not present

Red Hat CSAF VEX © Red Hat, Inc., from https://security.access.redhat.com/data/csaf/v2/vex/; changed: reduced to product statuses and remediations. CC BY 4.0 · csaf

Exploit prediction

72.86% chance of exploitation in the next 30 days, higher than 99.4% of all scored CVEs (FIRST EPSS, 2026-11-08).

CVSS scores

assigned by version score vector
NVD 3.0 7.5 CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
NVD 2.0 5.0 AV:N/AC:L/Au:N/C:N/I:N/A:P
GitHub 3.0 7.5 CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

Affected packages

ecosystem package affected fixed in
maven org.apache.tomcat.embed:tomcat-embed-core
>=9.0.0, <9.0.16
>=8.0.0, <8.5.38
9.0.16
8.5.38
maven org.apache.tomcat:tomcat-coyote
>=9.0.0, <9.0.16
>=8.0.0, <8.5.38
9.0.16
8.5.38

Affected products

  • n/a Apache Tomcat

Classification

Weakness
  • CWE-400 Uncontrolled Resource Consumption

References

Sources

Fencer Vulns keeps one entry per vulnerability: the CVE id wins, then GHSA, and records that alias each other are merged, except that two CVEs always keep separate entries. The same data is available as JSON.