---
title: "CVE-2016-9819\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-2016-9819?format=md
keywords: index, follow
---

# CVE-2016-9819

Publication date 1 March 2017

Last updated 25 August 2025

---

Ubuntu priority

**Medium**

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

## Cvss 3 Severity Score

**5.5 · Medium**

[Score breakdown](https://ubuntu.com/security/CVE-2016-9819?format=md#impact-score)

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## Description

libavcodec/mpegvideo.c in libav 11.8 allows remote attackers to cause a
denial of service (crash) via vectors involving left shift of a negative
value.

### From the Ubuntu Security Team

It was discovered that Libav incorrectly handled certain media
files. An attacker could possibly use this issue to cause a denial of
service or other unspecified impact.

[Read the notes from the security team](https://ubuntu.com/security/CVE-2016-9819?format=md#notes)

## Status

Show unmaintained releases

| Package | Ubuntu Release | Status |
| --- | --- | --- |
| libav | 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 |
| 17.04 zesty | Not in release |
| 16.10 yakkety | Not in release |
| 16.04 LTS xenial | Not in release |
| 14.04 LTS trusty | Fixed 6:9.20-0ubuntu0.14.04.1+esm1  Ubuntu Pro |
| 12.04 LTS precise | Ignored end of life |

---

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

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## Notes

---

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

reproducer in the asarubbo repo

## Severity score breakdown

CVSS version:
CVSS v3.0

**Base score**

5.5 · Medium

* Base metrics

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

  | Parameter | Value |
  | --- | --- |
  | Base score | 5.5 · Medium |
  | Exploitability score | - |
  | Impact score | - |

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

## References

* [MITRE](https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2016-9819)
* [NVD](https://nvd.nist.gov/vuln/detail/CVE-2016-9819)
* [Launchpad](https://launchpad.net/bugs/cve/CVE-2016-9819)
* [Debian](https://security-tracker.debian.org/tracker/CVE-2016-9819)

### Other references

* <https://blogs.gentoo.org/ago/2016/12/01/libav-multiple-crashes-from-the-undefined-behavior-sanitizer>
* <https://github.com/asarubbo/poc/blob/master/00036-libav-leftshift-mpegvideo>
* <https://www.cve.org/CVERecord?id=CVE-2016-9819>