---
title: "CVE-2019-17567\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-2019-17567?format=md
keywords: index, follow
---

# CVE-2019-17567

Publication date 10 June 2021

Last updated 26 August 2025

---

Ubuntu priority

**Medium**

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

## Cvss 3 Severity Score

**5.3 · Medium**

[Score breakdown](https://ubuntu.com/security/CVE-2019-17567?format=md#impact-score)

Toggle side navigation

## Description

Apache HTTP Server versions 2.4.6 to 2.4.46 mod\_proxy\_wstunnel configured
on an URL that is not necessarily Upgraded by the origin server was
tunneling the whole connection regardless, thus allowing for subsequent
requests on the same connection to pass through with no HTTP validation,
authentication or authorization possibly configured.

[Read the notes from the security team](https://ubuntu.com/security/CVE-2019-17567?format=md#notes)

## Status

Show unmaintained releases

| Package | Ubuntu Release | Status |
| --- | --- | --- |
| apache2 | 26.04 LTS resolute | Not affected |
| 25.10 questing | Not affected |
| 25.04 plucky | Not affected |
| 24.10 oracular | Not affected |
| 24.04 LTS noble | Not affected |
| 23.10 mantic | Not affected |
| 23.04 lunar | Not affected |
| 22.10 kinetic | Not affected |
| 22.04 LTS jammy | Not affected |
| 21.10 impish | Not affected |
| 21.04 hirsute | Ignored end of life |
| 20.10 groovy | Ignored end of life |
| 20.04 LTS focal | Vulnerable, fix deferred |
| 18.04 LTS bionic | Vulnerable, fix deferred |
| 16.04 LTS xenial | Vulnerable, fix deferred |
| 14.04 LTS trusty | Vulnerable, fix deferred |

---

* [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-2019-17567?format=md#patch-details)

## Notes

---

### [mdeslaur](https://launchpad.net/~mdeslaur)

The patches required to fix this in stable releases are quite
intrusive and change behaviour. It may not make sense to
backport them to stable releases.

### 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 |
| --- | --- |
| apache2 | * Upstream:   <https://svn.apache.org/r1885605> * Upstream:   <https://github.com/apache/httpd/pull/156> * Upstream:   <https://github.com/apache/httpd/pull/158> * Upstream:   [f7d35dc](https://github.com/apache/httpd/commit/f7d35dc166732bff0e55d1509202d76d53f8c270) * Upstream:   [9759745](https://github.com/apache/httpd/commit/97597452bbdadcbe561cd14fc3ee9049e7d371dd) * Upstream:   [41cdf59](https://github.com/apache/httpd/commit/41cdf59f2343f11fca5152542d843c3403c233db) * Upstream:   [a834551](https://github.com/apache/httpd/commit/a834551b8393065e8124767d5d9fbafb4ec8fd96) * Upstream:   [18c4ac5](https://github.com/apache/httpd/commit/18c4ac516f146dbbff7c4cc6b4cb8cda2f79090a) * Upstream:   [fa22b50](https://github.com/apache/httpd/commit/fa22b50457c81465b5079dc44c7f1f1cb7431f5d) * Upstream:   [cb517a3](https://github.com/apache/httpd/commit/cb517a3b8a2fc1785c7afeff0f0dce69608833f5) |

## Severity score breakdown

CVSS version:
CVSS v3.0

**Base score**

5.3 · Medium

* Base metrics

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

  | Parameter | Value |
  | --- | --- |
  | Base score | 5.3 · Medium |
  | Exploitability score | - |
  | Impact score | - |

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

## References

* [MITRE](https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2019-17567)
* [NVD](https://nvd.nist.gov/vuln/detail/CVE-2019-17567)
* [Launchpad](https://launchpad.net/bugs/cve/CVE-2019-17567)
* [Debian](https://security-tracker.debian.org/tracker/CVE-2019-17567)

### Other references

* <https://httpd.apache.org/security/vulnerabilities_24.html#CVE-2019-17567>
* <https://lists.apache.org/thread.html/r90f693a5c9fb75550ef1412436d5e682a5f845beb427fa6f23419a3c@%3Cannounce.httpd.apache.org%3E>
* <http://www.openwall.com/lists/oss-security/2021/06/10/2>
* <https://www.cve.org/CVERecord?id=CVE-2019-17567>