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.
References (20)
Core 20
Core References
Third Party Advisory, VDB Entry vdb-entry
x_refsource_bid
http://www.securityfocus.com/bid/108874
Vendor Advisory vendor-advisory
x_refsource_ubuntu
https://usn.ubuntu.com/4128-1/
Vendor Advisory vendor-advisory
x_refsource_ubuntu
https://usn.ubuntu.com/4128-2/
Vendor Advisory vendor-advisory
x_refsource_redhat
https://access.redhat.com/errata/RHSA-2019:3929
Vendor Advisory vendor-advisory
x_refsource_redhat
https://access.redhat.com/errata/RHSA-2019:3931
Mailing List vendor-advisory
x_refsource_suse
http://lists.opensuse.org/opensuse-security-announce/2020-01/msg00013.html
Mailing List mailing-list
x_refsource_mlist
https://lists.apache.org/thread.html/r6ccee4e849bc77df0840c7f853f6bd09d426f6741247da2b7429d5d9%40%3Cdev.tomcat.apache.org%3E
Mailing List mailing-list
x_refsource_mlist
https://lists.apache.org/thread.html/r3bbb800a816d0a51eccc5a228c58736960a9fffafa581a225834d97d%40%3Cdev.tomcat.apache.org%3E
Mailing List mailing-list
x_refsource_mlist
https://lists.apache.org/thread.html/raba0fabaf4d56d4325ab2aca8814f0b30a237ab83d8106b115ee279a%40%3Cdev.tomcat.apache.org%3E
Mailing List mailing-list
x_refsource_mlist
https://lists.apache.org/thread.html/r48c1444845fe15a823e1374674bfc297d5008a5453788099ea14caf0%40%3Cdev.tomcat.apache.org%3E
Third Party Advisory vendor-advisory
x_refsource_debian
https://www.debian.org/security/2020/dsa-4680
Vendor Advisory x_refsource_misc
https://www.oracle.com/security-alerts/cpuapr2020.html
Vendor Advisory x_refsource_misc
https://www.oracle.com/technetwork/security-advisory/cpuoct2019-5072832.html
Vendor Advisory x_refsource_misc
https://www.oracle.com/security-alerts/cpujan2020.html
Vendor Advisory x_refsource_misc
https://www.oracle.com/security-alerts/cpuoct2020.html
Mailing List x_refsource_misc
https://lists.apache.org/thread.html/df1a2c1b87c8a6c500ecdbbaf134c7f1491c8d79d98b48c6b9f0fa6a%40%3Cannounce.tomcat.apache.org%3E
Vendor Advisory x_refsource_confirm
https://www.synology.com/security/advisory/Synology_SA_19_29
Vendor Advisory x_refsource_confirm
https://security.netapp.com/advisory/ntap-20190625-0002/
Vendor Advisory x_refsource_confirm
https://support.f5.com/csp/article/K17321505
Vendor Advisory x_refsource_misc
https://www.oracle.com/security-alerts/cpuApr2021.html
Scores
CVSS v3
7.5
EPSS
0.7130
EPSS Percentile
98.7%
Attack Vector
NETWORK
CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
Details
CWE
CWE-667
Status
published
Products (3)
apache/tomcat
9.0.0 milestone1 (27 CPE variants)
apache/tomcat
8.5.0 - 8.5.40
org.apache.tomcat.embed/tomcat-embed-core
9.0.0.M1 - 9.0.20Maven
Published
Jun 21, 2019
Tracked Since
Feb 18, 2026