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Fencer Vulns
medium 4.8

CVE-2019-17569 json

Potential HTTP request smuggling in Apache Tomcat

published 2020-02-24 6 y ago modified 2026-08-25 2 mo ago also GHSA-767j-jfh2-jvrc , EUVD-2020-0293

cvss
4.8
version 3.1, NVD
cisa kev
Not listed
not in CISA's catalog
epss
8.9%
EPSS 8.9% chance of exploitation in 30 days, percentile 95%
public exploits
0
none known

Summary

The refactoring present in Apache Tomcat 9.0.28 to 9.0.30, 8.5.48 to 8.5.50 and 7.0.98 to 7.0.99 introduced a regression. The result of the regression was that invalid Transfer-Encoding headers were incorrectly processed leading to a possibility of HTTP Request Smuggling if Tomcat was located behind a reverse proxy that incorrectly handled the invalid Transfer-Encoding header in a particular manner. Such a reverse proxy is considered unlikely.

Patch / fix

  • maven org.apache.tomcat.embed:tomcat-embed-core 7.0.100, 8.5.51, 9.0.31
  • maven org.apache.tomcat:tomcat 7.0.100, 8.5.51, 9.0.31
  • tomcat9 Debian 14, Debian 13, Debian 12 9.0.31-1

debian advisories DEBIAN-CVE-2019-17569

  • jws5-tomcat jboss enterprise web server 5.3 9.0.30-3.redhat_4.1.el6jws
  • jws5-tomcat jboss enterprise web server 5.3 9.0.30-3.redhat_4.1.el7jws
  • jws5-tomcat jboss enterprise web server 5.3 9.0.30-3.redhat_4.1.el8jws
  • jws5-tomcat-lib jboss enterprise web server 5.3 9.0.30-3.redhat_4.1.el6jws
  • jws5-tomcat-lib jboss enterprise web server 5.3 9.0.30-3.redhat_4.1.el7jws
  • jws5-tomcat-lib jboss enterprise web server 5.3 9.0.30-3.redhat_4.1.el8jws
  • jws5-tomcat-native jboss enterprise web server 5.3 1.2.23-4.redhat_4.el6jws
  • jws5-tomcat-native jboss enterprise web server 5.3 1.2.23-4.redhat_4.el7jws

red hat advisories RHSA-2020:1520

  • tomcat SLES for SAP 12 SP3, SLES for SAP 12 SP2, SLES 12 SP3-LTSS +8 more 8.0.53-29.27.1
  • tomcat SLES for SAP 12 SP5, SLES for SAP 12 SP4, SLES 12 SP5 +1 more 9.0.31-3.25.1
  • tomcat SLE Module for Web and Scripting 15 SP1 9.0.31-4.22.1
  • tomcat SLES for SAP 15, SLES 15-LTSS, SLE High Performance Computing 15-LTSS +1 more 9.0.31-3.42.2
  • tomcat SLES for SAP 12 SP1, SLES 12 SP1-LTSS 8.0.53-10.43.1

suse advisories SUSE-SU-2020:1498-1SUSE-SU-2020:1497-1SUSE-SU-2020:0632-1SUSE-SU-2020:0631-1SUSE-SU-2020:0598-1

  • tomcat openSUSE Tumbleweed 9.0.36-8.4
  • tomcat10 openSUSE Tumbleweed 10.1.14-1.1
  • tomcat openSUSE Leap 15.1 9.0.31-lp151.3.12.1

opensuse advisories openSUSE-SU-2024:11468-1openSUSE-SU-2024:13441-1openSUSE-SU-2020:0345-1

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-2019-17569 updated cvss 4.3

tomcat: Regression in handling of Transfer-Encoding header allows for HTTP request smuggling

  • Red Hat JBoss Enterprise Application Platform 6 jbossweb jbossweb Red Hat JBoss Fuse 6 tomcat Red Hat OpenStack Platform 10 (Newton) opendaylight
    affected: no fix planned “Out of support scope”
  • Red Hat OpenStack Platform 13 (Queens) opendaylight
    affected: no fix planned “Will not fix”
  • Red Hat JBoss Web Server (JWS) 5.3
    fixed: vendor fix RHSA-2020:1521
  • Red Hat JBoss Web Server 5.3 for RHEL 6 Server jws5-tomcat 9.0.30-3.redhat_4.1.el6jws, jws5-tomcat-lib 9.0.30-3.redhat_4.1.el6jws, jws5-tomcat-native 1.2.23-4.redhat_4.el6jws, jws5-tomcat-javadoc 9.0.30-3.redhat_4.1.el6jws, jws5-tomcat-selinux 9.0.30-3.redhat_4.1.el6jws, jws5-tomcat-webapps 9.0.30-3.redhat_4.1.el6jws, +5 more Red Hat JBoss Web Server 5.3 for RHEL 7 Server jws5-tomcat 9.0.30-3.redhat_4.1.el7jws, jws5-tomcat-lib 9.0.30-3.redhat_4.1.el7jws, jws5-tomcat-native 1.2.23-4.redhat_4.el7jws, jws5-tomcat-javadoc 9.0.30-3.redhat_4.1.el7jws, jws5-tomcat-selinux 9.0.30-3.redhat_4.1.el7jws, jws5-tomcat-webapps 9.0.30-3.redhat_4.1.el7jws, +5 more Red Hat JBoss Web Server 5.3 for RHEL 8 jws5-tomcat 9.0.30-3.redhat_4.1.el8jws, jws5-tomcat-lib 9.0.30-3.redhat_4.1.el8jws, jws5-tomcat-native 1.2.23-4.redhat_4.el8jws, jws5-tomcat-javadoc 9.0.30-3.redhat_4.1.el8jws, jws5-tomcat-selinux 9.0.30-3.redhat_4.1.el8jws, jws5-tomcat-webapps 9.0.30-3.redhat_4.1.el8jws, +5 more
    fixed: vendor fix RHSA-2020:1520
  • Red Hat Decision Manager 7 tomcat Red Hat Enterprise Linux 5 tomcat5 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 Enterprise Linux 8 pki-servlet-engine, pki-servlet-4.0-api Red Hat Fuse 7 tomcat
    +3 more products
    Red Hat JBoss Web Server 3 tomcat Red Hat Process Automation 7 tomcat Red Hat support for Spring Boot tomcat
    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

8.87% chance of exploitation in the next 30 days, higher than 95% of all scored CVEs (FIRST EPSS, 2026-11-08).

CVSS scores

assigned by version score vector
NVD 3.1 4.8 CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:L/I:L/A:N
NVD 2.0 5.8 AV:N/AC:M/Au:N/C:P/I:P/A:N
GitHub 3.1 4.8 CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:L/I:L/A:N

Affected packages

ecosystem package affected fixed in
maven org.apache.tomcat.embed:tomcat-embed-core
>=7.0.98, <7.0.100
>=8.5.48, <8.5.51
>=9.0.28, <9.0.31
7.0.100
8.5.51
9.0.31
maven org.apache.tomcat:tomcat
>=7.0.98, <7.0.100
>=8.5.48, <8.5.51
>=9.0.28, <9.0.31
7.0.100
8.5.51
9.0.31

Affected products

  • Apache Apache Tomcat

Classification

Weakness
  • CWE-444 Inconsistent Interpretation of HTTP Requests

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.