---
title: "CVE-2019-16239\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-2019-16239?format=md
keywords: index, follow
---

# CVE-2019-16239

Publication date 17 September 2019

Last updated 29 July 2025

---

Ubuntu priority

**Medium**

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

## Cvss 3 Severity Score

**9.8 · Critical**

[Score breakdown](https://ubuntu.com/security/CVE-2019-16239?format=md#impact-score)

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## Description

process\_http\_response in OpenConnect before 8.05 has a Buffer Overflow when
a malicious server uses HTTP chunked encoding with crafted chunk sizes.

## Status

Show unmaintained releases

| Package | Ubuntu Release | Status |
| --- | --- | --- |
| openconnect | 22.10 kinetic | Not affected |
| 22.04 LTS jammy | Not affected |
| 21.10 impish | Ignored end of life |
| 21.04 hirsute | Ignored end of life |
| 20.10 groovy | Ignored end of life |
| 20.04 LTS focal | Not affected |
| 19.10 eoan | Ignored end of life |
| 19.04 disco | Ignored end of life |
| 18.04 LTS bionic | Fixed 7.08-3ubuntu0.18.04.2 |
| 16.04 LTS xenial | Not affected |
| 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-2019-16239?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 |
| --- | --- |
| openconnect | * Upstream:   [875f0a6](https://github.com/openconnect/openconnect/commit/875f0a65ab73f4fb581ca870fd3a901bd278f8e8) |

## Severity score breakdown

CVSS version:
CVSS v3.0

**Base score**

9.8 · Critical

* Base metrics

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

  | Parameter | Value |
  | --- | --- |
  | Base score | 9.8 · Critical |
  | Exploitability score | - |
  | Impact score | - |

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

## References

* [MITRE](https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2019-16239)
* [NVD](https://nvd.nist.gov/vuln/detail/CVE-2019-16239)
* [Launchpad](https://launchpad.net/bugs/cve/CVE-2019-16239)
* [Debian](https://security-tracker.debian.org/tracker/CVE-2019-16239)

### Related Ubuntu Security Notices (USN)

+ [USN-4565-1](https://usn.ubuntu.com/USN-4565-1)
+ OpenConnect vulnerability
+ 5 October 2020

### Other references

* <http://lists.infradead.org/pipermail/openconnect-devel/2019-September/005412.html>
* <https://github.com/openconnect/openconnect/commit/875f0a65ab73f4fb581ca870fd3a901bd278f8e8>
* <https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/FX56KYWC7X4ETV4P6HGJC7GZUEBITBBS/>
* <https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/HDMZGNBLZZKAGBI2PNXYWWKLD2LXKFH6/>
* <https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/WI7ZENFAWCHF2RU4NHPL2CU4WGZ4BNDJ/>
* <https://t2.fi/schedule/2019/>
* <https://www.cve.org/CVERecord?id=CVE-2019-16239>