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4.8Medium

Apache Tomcat

CVE-2019-17569

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.

What this means for your business

  • It affects Apache Tomcat. It matters if your company, or a supplier that handles your data, runs it.
  • An attacker can use it remotely, over a network, without a login, and without anyone at your company clicking anything.

What to do

  1. 1Check whether your company or your suppliers run Apache Tomcat, and which version. The affected versions are listed further down this page.
  2. 2If you do, apply the vendor's fix. A patch or vendor advisory has been published.

Not sure if your company is exposed?

Fastnexa’s certified penetration testers can check whether attackers could use this flaw, or others like it, against your websites, apps and network. The full test is free for our first 10 founding clients until 31 December 2026.

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Scoring

CVSS
4.8 (v3.1)
Vector
CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:L/I:L/A:N
Weakness
CWE-444
Assigned by
security@apache.org

Dates

Published
2020-02-24
Last modified
2026-08-25
Sources
NVD

Affected products

  • Apache Tomcat7.0.98 - 7.0.99, 8.5.48 - 8.5.50, 9.0.28 - 9.0.30
  • Apache Tomee7.0.7
  • Opensuse Leap15.1
  • Netapp Data Availability Servicesall versions
  • Netapp Oncommand System Manager3.0.0 - 3.1.3
  • Debian Debian Linux9.0, 10.0
  • Oracle Agile Engineering Data Management6.2.1.0
  • Oracle Agile Product Lifecycle Management9.3.3, 9.3.5, 9.3.6
  • 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, 4.2.1

As listed in the NVD configuration data. Not a statement about your estate.

References