---
title: "CVE-2019-17569\n    | Ubuntu"
description: Ubuntu is an open source software operating system that runs from the
  desktop, to the cloud, to all your internet connected things.
url: https://ubuntu.com/security/CVE-2019-17569?format=md
keywords: index, follow
---

# CVE-2019-17569

Publication date 24 February 2020

Last updated 25 August 2025

---

Ubuntu priority

**Low**

[Why this priority?](https://ubuntu.com/security/cves/about#priority )

## Cvss 3 Severity Score

**4.8 · Medium**

[Score breakdown](https://ubuntu.com/security/CVE-2019-17569?format=md#impact-score)

Toggle side navigation

## Description

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.

## Status

Show unmaintained releases

| Package | Ubuntu Release | Status |
| --- | --- | --- |
| tomcat7 | 19.10 eoan | Not in release |
| 18.04 LTS bionic | Not affected |
| 16.04 LTS xenial | Not affected |
| 14.04 LTS trusty | Not affected |
| tomcat8 | 19.10 eoan | Not in release |
| 18.04 LTS bionic | Not affected |
| 16.04 LTS xenial | Not affected |
| 14.04 LTS trusty | Not in release |
| tomcat9 | 19.10 eoan | Not affected |
| 18.04 LTS bionic | Not affected |
| 16.04 LTS xenial | Not in release |
| 14.04 LTS trusty | Not in release |

---

* [How can I get the fixes?](https://ubuntu.com/security/cves/about#security)
* [What do statuses mean?](https://ubuntu.com/security/cves/about#statuses)
* [Patch details](https://ubuntu.com/security/CVE-2019-17569?format=md#patch-details)

### Patch details

For informational purposes only. We recommend not to cherry-pick updates. [How can I get the fixes?](https://ubuntu.com/security/cves/about#security)

| Package | Patch details |
| --- | --- |
| tomcat7 | * Upstream:   [b191a0d](https://github.com/apache/tomcat/commit/b191a0d9cf06f4e04257c221bfe41d2b108a9cc8) |
| tomcat8 | * Upstream:   [959f1df](https://github.com/apache/tomcat/commit/959f1dfd767bf3cb64776b44f7395d1d8d8f7ab3) |
| tomcat9 | * Upstream:   [060ecc5](https://github.com/apache/tomcat/commit/060ecc5eb839208687b7fcc9e35287ac8eb46998) |

## Severity score breakdown

CVSS version:
CVSS v3.0

**Base score**

4.8 · Medium

* Base metrics

  | Parameter | Value |
  | --- | --- |
  | Attack vector | Network |
  | Attack complexity | High |
  | Privileges required | None |
  | User interaction | None |
  | Scope | Unchanged |
  | Confidentiality impact | Low |
  | Integrity impact | Low |
  | Availability impact | None |
* Scores

  | Parameter | Value |
  | --- | --- |
  | Base score | 4.8 · Medium |
  | Exploitability score | - |
  | Impact score | - |

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

## References

* [MITRE](https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2019-17569)
* [NVD](https://nvd.nist.gov/vuln/detail/CVE-2019-17569)
* [Launchpad](https://launchpad.net/bugs/cve/CVE-2019-17569)
* [Debian](https://security-tracker.debian.org/tracker/CVE-2019-17569)

### Other references

* <https://lists.apache.org/thread.html/r88def002c5c78534674ca67472e035099fbe088813d50062094a1390%40%3Cannounce.tomcat.apache.org%3E>
* <https://www.cve.org/CVERecord?id=CVE-2019-17569>