Description
The fix for CVE-2019-0199 was incomplete and did not address HTTP/2 connection window exhaustion on write in Apache Tomcat versions 9.0.0.M1 to 9.0.19 and 8.5.0 to 8.5.40 . By not sending WINDOW_UPDATE messages for the connection window (stream 0) clients were able to cause server-side threads to block eventually leading to thread exhaustion and a DoS.
Affected products
| Vendor | Product | Affected | Fixed |
|---|---|---|---|
| — | Apache Tomcat | Apache Tomcat 9.0.0.M1 to 9.0.19, 8.5.0 to 8.5.40 | — |
Fixed in Linux distributions
Distributions backport fixes, so the version that fixes this vulnerability differs per release — upgrade to at least the version shown. From the distributions' security trackers and advisories.
Debian
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Debian 14 | tomcat9 | 9.0.22-1 | — |
| Debian 13 | tomcat9 | 9.0.22-1 | — |
| Debian 12 | tomcat9 | 9.0.22-1 | — |
| Debian 10 | tomcat9 | 9.0.31-1~deb10u1 | DSA-4680-1 |
Ubuntu
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Ubuntu 18.04 LTS | tomcat8 | 8.5.39-1ubuntu1~18.04.3 | USN-4128-1 |
| Ubuntu 18.04 LTS | tomcat9 | 9.0.16-3ubuntu0.18.04.1 | USN-4128-2 |
| Ubuntu 16.04 LTS | tomcat8 | 8.0.32-1ubuntu1.10 | USN-4128-1 |
Red Hat
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Red Hat JBoss Web Server 5 | jws5-ecj | 4.12.0-1.redhat_1.1.el6jws | RHSA-2019:3929 |
| Red Hat JBoss Web Server 5 | jws5-javapackages-tools +1 | 3.4.1-5.15.11.el6jws | RHSA-2019:3929 |
| Red Hat JBoss Web Server 5 | jws5-jboss-logging | 3.3.2-1.Final_redhat_00001.1.el6jws | RHSA-2019:3929 |
| Red Hat JBoss Web Server 5 | jws5-mod_cluster +1 | 1.4.1-1.Final_redhat_00001.2.el6jws | RHSA-2019:3929 |
| Red Hat JBoss Web Server 5 | jws5-tomcat +9 | 9.0.21-10.redhat_4.1.el6jws | RHSA-2019:3929 |
| Red Hat JBoss Web Server 5 | jws5-tomcat-native | 1.2.21-34.redhat_34.el6jws | RHSA-2019:3929 |
| Red Hat JBoss Web Server 5 | jws5-tomcat-vault +1 | 1.1.8-1.Final_redhat_1.1.el6jws | RHSA-2019:3929 |
SUSE
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| SLES 15 SP1 | tomcat | 9.0.30-4.10.1 | SUSE-SU-2020:0029-1 |
| SLES 15 | tomcat | 9.0.30-3.34.1 | SUSE-SU-2020:0226-1 |
| SLES 12 SP5 | tomcat | 9.0.31-3.25.1 | SUSE-SU-2020:0632-1 |
| SLES 12 SP4 | tomcat | 9.0.21-3.13.2 | SUSE-SU-2020:0632-1, SUSE-SU-2019:1866-1 |
Show 2 more (older releases, extended support, other products)Fewer releases
| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| SLES for SAP 12 SP5 | tomcat | 9.0.31-3.25.1 | SUSE-SU-2020:0632-1 |
| SLES for SAP 12 SP4 | tomcat | 9.0.21-3.13.2 | SUSE-SU-2020:0632-1, SUSE-SU-2019:1866-1 |
openSUSE
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| openSUSE Tumbleweed | tomcat | 9.0.36-8.4 | openSUSE-SU-2024:11468-1 |
| openSUSE Tumbleweed | tomcat10 | 10.1.14-1.1 | openSUSE-SU-2024:13441-1 |
| openSUSE Leap 15.1 | tomcat | 9.0.30-lp151.3.6.1 | openSUSE-SU-2020:0038-1 |
Affected packages
| Ecosystem | Package | Affected | Fixed | Record |
|---|---|---|---|---|
| Maven | org.apache.tomcat.embed:tomcat-embed-core | >= 9.0.0.M1, < 9.0.20 | 9.0.20 | GHSA-q4hg-rmq2-52q9 |
| Maven | org.apache.tomcat.embed:tomcat-embed-core | >= 8.5.0, < 8.5.41 | 8.5.41 | GHSA-q4hg-rmq2-52q9 |
Advisories 12
- RHSA-2019:3929 Red Hat Security Advisory: Red Hat JBoss Web Server 5.2 security release Red Hat Security Advisories (RHSA) · Sep 21, 2026
- DSA-4680-1 tomcat9 - security update Debian Security (DSA / DLA) · Mar 9, 2026
- USN-4128-1 tomcat8 vulnerabilities Ubuntu Security Notices (USN) · Feb 10, 2026
- USN-4128-2 tomcat9 vulnerabilities Ubuntu Security Notices (USN) · Feb 10, 2026
- SUSE-SU-2020:0632-1 Security update for tomcat SUSE / openSUSE Security Updates · Feb 4, 2026
- SUSE-SU-2020:0029-1 Security update for tomcat SUSE / openSUSE Security Updates · Feb 4, 2026
- SUSE-SU-2020:0226-1 Security update for tomcat SUSE / openSUSE Security Updates · Feb 4, 2026
- openSUSE-SU-2024:11468-1 tomcat-9.0.36-8.4 on GA media SUSE / openSUSE Security Updates · Feb 4, 2026
- openSUSE-SU-2020:0038-1 Security update for tomcat SUSE / openSUSE Security Updates · Feb 4, 2026
- SUSE-SU-2019:1866-1 Security update for tomcat SUSE / openSUSE Security Updates · Feb 4, 2026
- openSUSE-SU-2024:13441-1 tomcat10-10.1.14-1.1 on GA media SUSE / openSUSE Security Updates · Feb 4, 2026
- WID-SEC-2024-0528 Dell Data Protection Advisor: Mehrere Schwachstellen BSI CERT-Bund (WID) · Feb 29, 2024
References
- 108874 vdb-entry
- USN-4128-1 vendor-advisory
- USN-4128-2 vendor-advisory
- RHSA-2019:3929 vendor-advisory
- RHSA-2019:3931 vendor-advisory
- openSUSE-SU-2020:0038 vendor-advisory
- [tomcat-dev] 20200203 svn commit: r1873527 [24/30] - /tomcat/site/trunk/docs/ mailing-list
- [tomcat-dev] 20200203 svn commit: r1873527 [25/30] - /tomcat/site/trunk/docs/ mailing-list
- [tomcat-dev] 20200213 svn commit: r1873980 [28/34] - /tomcat/site/trunk/docs/ mailing-list
- [tomcat-dev] 20200213 svn commit: r1873980 [29/34] - /tomcat/site/trunk/docs/ mailing-list
- DSA-4680 vendor-advisory
- https://www.oracle.com/security-alerts/cpuapr2020.html
- https://www.oracle.com/technetwork/security-advisory/cpuoct2019-5072832.html
- https://www.oracle.com/security-alerts/cpujan2020.html
- https://www.oracle.com/security-alerts/cpuoct2020.html
- https://lists.apache.org/thread.html/df1a2c1b87c8a6c500ecdbbaf134c7f1491c8d79d98b48c6b9f0fa6a%40%3Cannounce.tomcat.apache.org%3E
- https://www.synology.com/security/advisory/Synology_SA_19_29
- https://security.netapp.com/advisory/ntap-20190625-0002/
- https://support.f5.com/csp/article/K17321505
- https://www.oracle.com/security-alerts/cpuApr2021.html