---
title: "CVE-2018-14642\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-2018-14642?format=md
keywords: index, follow
---

# CVE-2018-14642

Publication date 18 September 2018

Last updated 11 July 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-2018-14642?format=md#impact-score)

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## Description

An information leak vulnerability was found in Undertow. If all headers are
not written out in the first write() call then the code that handles
flushing the buffer will always write out the full contents of the
writevBuffer buffer, which may contain data from previous requests.

## Status

Show unmaintained releases

| Package | Ubuntu Release | Status |
| --- | --- | --- |
| undertow | 26.04 LTS resolute | Needs evaluation |
| 25.10 questing | Ignored end of life, was needs-triage |
| 25.04 plucky | Ignored end of life, was needs-triage |
| 24.10 oracular | Ignored end of life, was needs-triage |
| 24.04 LTS noble | Needs evaluation |
| 23.10 mantic | Not in release |
| 23.04 lunar | Not in release |
| 22.10 kinetic | Fixed 2.0.23-1 |
| 22.04 LTS jammy | Fixed 2.0.23-1 |
| 21.10 impish | Fixed 2.0.23-1 |
| 21.04 hirsute | Fixed 2.0.23-1 |
| 20.10 groovy | Fixed 2.0.23-1 |
| 20.04 LTS focal | Fixed 2.0.23-1 |
| 19.10 eoan | Fixed 2.0.23-1 |
| 19.04 disco | Ignored end of life |
| 18.10 cosmic | Ignored end of life |
| 18.04 LTS bionic | Needs evaluation |
| 16.04 LTS xenial | Needs evaluation |
| 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)

## Severity score breakdown

CVSS version:
CVSS v3.0

**Base score**

5.3 · Medium

* Base metrics

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

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

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

## References

* [MITRE](https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2018-14642)
* [NVD](https://nvd.nist.gov/vuln/detail/CVE-2018-14642)
* [Launchpad](https://launchpad.net/bugs/cve/CVE-2018-14642)
* [Debian](https://security-tracker.debian.org/tracker/CVE-2018-14642)

### Other references

* <https://bugzilla.redhat.com/show_bug.cgi?id=1628702>
* <https://bugzilla.redhat.com/show_bug.cgi?id=CVE-2018-14642>
* <https://www.cve.org/CVERecord?id=CVE-2018-14642>