CVE-2019-17569· NVD / CVE Program· CNA apache

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 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.

MediumCVSS 4.8 · v3.1—No exploit Fix available

Pre-auth

Published: Feb 24, 2020
Updated: Aug 25, 2026
EPSS: 8.9% · 95th percentile
CWE: CWE-444

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Low priority for now.

CVSS: 19 / 40 · 4.8 / 10
CISA KEV: 0 / 30 · Not listed
EPSS: 3 / 30 · 8.9%

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Affected systems

Vendor	Product	CPE
apache	tomcat	cpe:2.3:a:apache:tomcat
apache	tomee	cpe:2.3:a:apache:tomee
opensuse	leap	cpe:2.3:o:opensuse:leap
netapp	data availability services	cpe:2.3:a:netapp:data_availability_services
netapp	oncommand system manager	cpe:2.3:a:netapp:oncommand_system_manager
debian	debian linux	cpe:2.3:o:debian:debian_linux
oracle	agile engineering data management	cpe:2.3:a:oracle:agile_engineering_data_management
oracle	agile product lifecycle management	cpe:2.3:a:oracle:agile_product_lifecycle_management
oracle	communications instant messaging server	cpe:2.3:a:oracle:communications_instant_messaging_server
oracle	health sciences empirica inspections	cpe:2.3:a:oracle:health_sciences_empirica_inspections
oracle	health sciences empirica signal	cpe:2.3:a:oracle:health_sciences_empirica_signal
oracle	hospitality guest access	cpe:2.3:a:oracle:hospitality_guest_access

and 4 more

Affected versions

NVD version ranges (for catalog products). Add the product to your stack with a version and matching uses these.

apache tomcat7.0.98 and later · up to 7.0.99 inclusive
apache tomcat8.5.48 and later · up to 8.5.50 inclusive
apache tomcat9.0.28 and later · up to 9.0.30 inclusive
apache tomee7.0.7
debian debian linux10.0
debian debian linux9.0
netapp data availability servicesall versions
netapp oncommand system manager3.0.0 and later · up to 3.1.3 inclusive
opensuse leap15.1
oracle agile engineering data management6.2.1.0
oracle agile product lifecycle management9.3.3
oracle agile product lifecycle management9.3.5
oracle agile product lifecycle management9.3.6
oracle communications instant messaging server10.0.1.4.0
oracle health sciences empirica inspections1.0.1.2
oracle health sciences empirica signal7.3.3
oracle hospitality guest access4.2.0
oracle hospitality guest access4.2.1
oracle instantis enterprisetrack17.1 and later · up to 17.3 inclusive
oracle mysql enterprise monitorup to 4.0.12 inclusive

Versions reported by the vendor

Affected version ranges reported by the assigning authority (apache). Independent of NVD's CPE analysis and usually ahead of it.

Apache Apache Tomcat
- Apache Tomcat 9.0.28 to 9.0.30, 8.5.48 to 8.5.50, 7.0.98 to 7.0.99affected

Package-level exposure

OSV and GitHub Advisory data: ecosystem, package and range. SBOM matching uses this table.

Ecosystem	Package	Affected range	Fix
Debian:10	tomcat9	before 9.0.31-1~deb10u1	9.0.31-1~deb10u1
Debian:12	tomcat9	before 9.0.31-1	9.0.31-1
Debian:8	tomcat7	before 7.0.56-3+really7.0.100-1	7.0.56-3+really7.0.100-1
Debian:9	tomcat8	before 8.5.54-0+deb9u1	8.5.54-0+deb9u1
Maven	org.apache.tomcat:tomcat	from 7.0.98 · before 7.0.100	7.0.100
Maven	org.apache.tomcat:tomcat	from 8.5.48 · before 8.5.51	8.5.51
Maven	org.apache.tomcat:tomcat	from 9.0.28 · before 9.0.31	9.0.31
Maven	org.apache.tomcat.embed:tomcat-embed-core	from 7.0.98 · before 7.0.100	7.0.100
Maven	org.apache.tomcat.embed:tomcat-embed-core	from 8.5.48 · before 8.5.51	8.5.51
Maven	org.apache.tomcat.embed:tomcat-embed-core	from 9.0.28 · before 9.0.31	9.0.31
openSUSE:Leap 15.1	tomcat	before 9.0.31-lp151.3.12.1	9.0.31-lp151.3.12.1
openSUSE:Tumbleweed	tomcat	before 9.0.36-8.4	9.0.36-8.4
Red Hat:jboss_enterprise_web_server:5.3::el6	jws5-tomcat	before 0:9.0.30-3.redhat_4.1.el6jws	0:9.0.30-3.redhat_4.1.el6jws
Red Hat:jboss_enterprise_web_server:5.3::el6	jws5-tomcat-admin-webapps	before 0:9.0.30-3.redhat_4.1.el6jws	0:9.0.30-3.redhat_4.1.el6jws
Red Hat:jboss_enterprise_web_server:5.3::el6	jws5-tomcat-docs-webapp	before 0:9.0.30-3.redhat_4.1.el6jws	0:9.0.30-3.redhat_4.1.el6jws
Red Hat:jboss_enterprise_web_server:5.3::el6	jws5-tomcat-el-3.0-api	before 0:9.0.30-3.redhat_4.1.el6jws	0:9.0.30-3.redhat_4.1.el6jws
Red Hat:jboss_enterprise_web_server:5.3::el6	jws5-tomcat-javadoc	before 0:9.0.30-3.redhat_4.1.el6jws	0:9.0.30-3.redhat_4.1.el6jws
Red Hat:jboss_enterprise_web_server:5.3::el6	jws5-tomcat-jsp-2.3-api	before 0:9.0.30-3.redhat_4.1.el6jws	0:9.0.30-3.redhat_4.1.el6jws
Red Hat:jboss_enterprise_web_server:5.3::el6	jws5-tomcat-lib	before 0:9.0.30-3.redhat_4.1.el6jws	0:9.0.30-3.redhat_4.1.el6jws
Red Hat:jboss_enterprise_web_server:5.3::el6	jws5-tomcat-native	before 0:1.2.23-4.redhat_4.el6jws	0:1.2.23-4.redhat_4.el6jws
Red Hat:jboss_enterprise_web_server:5.3::el6	jws5-tomcat-native-debuginfo	before 0:1.2.23-4.redhat_4.el6jws	0:1.2.23-4.redhat_4.el6jws
Red Hat:jboss_enterprise_web_server:5.3::el6	jws5-tomcat-selinux	before 0:9.0.30-3.redhat_4.1.el6jws	0:9.0.30-3.redhat_4.1.el6jws
Red Hat:jboss_enterprise_web_server:5.3::el6	jws5-tomcat-servlet-4.0-api	before 0:9.0.30-3.redhat_4.1.el6jws	0:9.0.30-3.redhat_4.1.el6jws
Red Hat:jboss_enterprise_web_server:5.3::el6	jws5-tomcat-webapps	before 0:9.0.30-3.redhat_4.1.el6jws	0:9.0.30-3.redhat_4.1.el6jws

+29

Same product

apache: all records

Other highest-scoring records for the same primary product.

CVE-2025-24813Apache Tomcat: Potential RCE and/or information disclosure and/or information corruption with partial PUTKEV
99Now
CVE-2016-8735Remote code execution is possible with Apache Tomcat before 6.0.48, 7.x before 7.0.73, 8.x before 8.0.39, 8.5.x before 8.5.7, and 9.x beforeKEV
96Now
CVE-2017-12617When running Apache Tomcat versions 9.0.0.M1 to 9.0.0, 8.5.0 to 8.5.22, 8.0.0.RC1 to 8.0.46 and 7.0.0 to 7.0.81 with HTTP PUTs enabled (e.g.KEV
92Now
CVE-2017-12615When running Apache Tomcat 7.0.0 to 7.0.79 on Windows with HTTP PUTs enabled (e.g.KEV
92Now
CVE-2026-34486Apache Tomcat: Fix for CVE-2026-29146 allowed bypass of EncryptInterceptorKEV
62This week
CVE-2019-0232When running on Windows with enableCmdLineArguments enabled, the CGI Servlet in Apache Tomcat 9.0.0.M1 to 9.0.17, 8.5.0 to 8.5.39 and 7.0.0
62This week

Remediation

Which version to upgrade to

Fix versions compiled from the vendor, package registries and Microsoft. Verify the vendor's note before upgrading.

Product / package	Fixed version	Source
debian:tomcat7	7.0.56-3+really7.0.100-1 · Debian:8	Package registry (OSV)
debian:tomcat8	8.5.54-0+deb9u1 · Debian:9	Package registry (OSV)
debian:tomcat9	9.0.31-1 · Debian:12	Package registry (OSV)
Maven:org.apache.tomcat:tomcat	7.0.100	Package registry (OSV)
Maven:org.apache.tomcat:tomcat	8.5.51	Package registry (OSV)
Maven:org.apache.tomcat:tomcat	9.0.31	Package registry (OSV)
Maven:org.apache.tomcat.embed:tomcat-embed-core	7.0.100	Package registry (OSV)
Maven:org.apache.tomcat.embed:tomcat-embed-core	8.5.51	Package registry (OSV)
Maven:org.apache.tomcat.embed:tomcat-embed-core	9.0.31	Package registry (OSV)
opensuse:tomcat	9.0.31-lp151.3.12.1 · openSUSE:Leap 15.1	Package registry (OSV)
red hat:jws5-tomcat	0:9.0.30-3.redhat_4.1.el6jws · Red Hat:jboss_enterprise_web_server:5.3::el6	Package registry (OSV)
red hat:jws5-tomcat-admin-webapps	0:9.0.30-3.redhat_4.1.el6jws · Red Hat:jboss_enterprise_web_server:5.3::el6	Package registry (OSV)
red hat:jws5-tomcat-docs-webapp	0:9.0.30-3.redhat_4.1.el6jws · Red Hat:jboss_enterprise_web_server:5.3::el6	Package registry (OSV)
red hat:jws5-tomcat-el-3.0-api	0:9.0.30-3.redhat_4.1.el6jws · Red Hat:jboss_enterprise_web_server:5.3::el6	Package registry (OSV)
red hat:jws5-tomcat-javadoc	0:9.0.30-3.redhat_4.1.el6jws · Red Hat:jboss_enterprise_web_server:5.3::el6	Package registry (OSV)
red hat:jws5-tomcat-jsp-2.3-api	0:9.0.30-3.redhat_4.1.el6jws · Red Hat:jboss_enterprise_web_server:5.3::el6	Package registry (OSV)
red hat:jws5-tomcat-lib	0:9.0.30-3.redhat_4.1.el6jws · Red Hat:jboss_enterprise_web_server:5.3::el6	Package registry (OSV)
red hat:jws5-tomcat-native	0:1.2.23-4.redhat_4.el6jws · Red Hat:jboss_enterprise_web_server:5.3::el6	Package registry (OSV)
red hat:jws5-tomcat-native-debuginfo	0:1.2.23-4.redhat_4.el6jws · Red Hat:jboss_enterprise_web_server:5.3::el6	Package registry (OSV)
red hat:jws5-tomcat-selinux	0:9.0.30-3.redhat_4.1.el6jws · Red Hat:jboss_enterprise_web_server:5.3::el6	Package registry (OSV)
red hat:jws5-tomcat-servlet-4.0-api	0:9.0.30-3.redhat_4.1.el6jws · Red Hat:jboss_enterprise_web_server:5.3::el6	Package registry (OSV)
red hat:jws5-tomcat-webapps	0:9.0.30-3.redhat_4.1.el6jws · Red Hat:jboss_enterprise_web_server:5.3::el6	Package registry (OSV)
suse:tomcat	9.0.31-3.42.2 · SUSE:Linux Enterprise High Performance Computing 15-ESPOS	Package registry (OSV)

Exploit status

No known public exploit

No public exploit has been observed yet. That doesn't mean you're safe, only that the bar is a little higher.

Research context

For pentesters and researchers: attack profile, score disagreement, timeline, patch commits, credits, variant and chain candidates, bug bounty scope. All derived from existing data; no exploit code.

Timeline

From publication to today: proof of concept, Metasploit module, CISA KEV and fix record. Dates are as reported by the sources.

No dated events beyond publication.

EPSS, last 120 days

FIRST EPSS daily score; only changes of 0.01 or more are recorded (step chart).

Patch and commit links

Commit, PR and diff links among the references. A starting point for patch-diffing and variant hunting; fixes, not exploits.

No commit or PR link among the references.

Credits

All researchers

Finders, reporters and analysts named in the CNA record. Click a name for that researcher’s other records.

No credits in the CNA record.

Variant candidates

Same product, same weakness class, within 18 months. If the patch missed the root cause, the sibling bug is here.

No nightly-computed relations.

Chain candidates

An authentication bypass and a privilege-requiring bug in the same product, published close together: combined they may become an unauthenticated path.

—

Bug bounty scope

No known public program.

Source: bounty-targets-data (public HackerOne, Bugcrowd, Intigriti, YesWeHack listings).

National notice (Türkiye Cybersecurity Directorate / USOM)

Official security notices citing this record; remediation advice is on the agency's page.

TR-20-394 · May 29, 2020(Apache, Tomcat için Güvenlik Güncellemeleri Yayınladı)
TR-20-203 · Apr 7, 2020(Apache, Tomcat için Güvenlik Güncellemeleri Yayınladı)

All national notices →

Technical details

Attack conditions

Anyone who can reach it over the internet can trigger it.
No account or password is required.
No user action is required.
Special conditions such as timing or configuration are required.

If successful

Confidentiality: low · data can be read
Integrity: low · data or configuration can be modified
Availability: none

Attack vector: Network
Attack complexity: High
Privileges required: None
User interaction: None
Scope: Unchanged
Confidentiality impact: Low
Integrity impact: Low
Availability impact: None

Weakness class (CWE)

CWE-444 · Inconsistent Interpretation of HTTP Requests ('HTTP Request/Response Smuggling')

CVSS vector

CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:L/I:L/A:N

nvd-primary

Attack context

MITRE CAPEC attack patterns and ATT&CK techniques for this weakness class (CWE). A starting point for detection rules and threat hunting.

Attack patterns (CAPEC)

ATT&CK techniques

—

Change log

Fix✗ → ✓Sep 28, 2026, 10:45 PM UTC

For records you follow, these changes also arrive as notifications. →

References

Vendor advisories and official records. Exploit/PoC links are deliberately left out.

All records

Noroxi analysis

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Data sources and verification

CNA: apache

CVE.org (CNA)Aug 5, 2024, 1:40 AM UTC
NVDAug 25, 2026, 12:28 PM UTC
FIRST EPSSOct 5, 2026, 12:00 AM UTC
OSV / GHSAOct 6, 2026, 3:23 AM UTC

Each line is when that source was last processed for this record.

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