---
title: "CVE-2017-7656\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-2017-7656?format=md
keywords: index, follow
---

# CVE-2017-7656

Publication date 26 June 2018

Last updated 26 August 2025

---

Ubuntu priority

**Medium**

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

## Cvss 3 Severity Score

**7.5 · High**

[Score breakdown](https://ubuntu.com/security/CVE-2017-7656?format=md#impact-score)

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## Description

In Eclipse Jetty, versions 9.2.x and older, 9.3.x (all configurations), and
9.4.x (non-default configuration with RFC2616 compliance enabled), HTTP/0.9
is handled poorly. An HTTP/1 style request line (i.e. method space URI
space version) that declares a version of HTTP/0.9 was accepted and treated
as a 0.9 request. If deployed behind an intermediary that also accepted and
passed through the 0.9 version (but did not act on it), then the response
sent could be interpreted by the intermediary as HTTP/1 headers. This could
be used to poison the cache if the server allowed the origin client to
generate arbitrary content in the response.

[Read the notes from the security team](https://ubuntu.com/security/CVE-2017-7656?format=md#notes)

## Status

Show unmaintained releases

| Package | Ubuntu Release | Status |
| --- | --- | --- |
| jetty9 | 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 | Not affected |
| 20.10 groovy | Not affected |
| 20.04 LTS focal | Not affected |
| 19.10 eoan | Not affected |
| 19.04 disco | Not affected |
| 18.10 cosmic | Not affected |
| 18.04 LTS bionic | Vulnerable |
| 17.10 artful | Ignored end of life |
| 16.04 LTS xenial | Vulnerable |
| 14.04 LTS trusty | Not in release |
| jetty8 | 26.04 LTS resolute | Not in release |
| 25.10 questing | Not in release |
| 25.04 plucky | Not in release |
| 24.10 oracular | Not in release |
| 24.04 LTS noble | Not in release |
| 23.10 mantic | Not in release |
| 23.04 lunar | Not in release |
| 22.10 kinetic | Not in release |
| 22.04 LTS jammy | Not in release |
| 21.10 impish | Not in release |
| 21.04 hirsute | Not in release |
| 20.10 groovy | Not in release |
| 20.04 LTS focal | Not in release |
| 19.10 eoan | Not in release |
| 19.04 disco | Not in release |
| 18.10 cosmic | Not in release |
| 18.04 LTS bionic | Not in release |
| 17.10 artful | Not in release |
| 16.04 LTS xenial | Ignored |
| 14.04 LTS trusty | Ignored end of standard support |

---

* [How can I get the fixes?](https://ubuntu.com/security/cves/about#security)
* [What do statuses mean?](https://ubuntu.com/security/cves/about#statuses)

## Notes

---

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

jetty8 ignored (very hard to exploit, complex patch)

## Severity score breakdown

CVSS version:
CVSS v3.0

**Base score**

7.5 · High

* Base metrics

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

  | Parameter | Value |
  | --- | --- |
  | Base score | 7.5 · High |
  | Exploitability score | - |
  | Impact score | - |

**Vector:** CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N

## References

* [MITRE](https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2017-7656)
* [NVD](https://nvd.nist.gov/vuln/detail/CVE-2017-7656)
* [Launchpad](https://launchpad.net/bugs/cve/CVE-2017-7656)
* [Debian](https://security-tracker.debian.org/tracker/CVE-2017-7656)

### Other references

* <https://bugs.eclipse.org/bugs/show_bug.cgi?id=535667>
* <https://www.cve.org/CVERecord?id=CVE-2017-7656>