---
title: "CVE-2018-5766\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-2018-5766?format=md
keywords: index, follow
---

# CVE-2018-5766

Publication date 18 January 2018

Last updated 26 August 2025

---

Ubuntu priority

**Medium**

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

## Cvss 3 Severity Score

**8.8 · High**

[Score breakdown](https://ubuntu.com/security/CVE-2018-5766?format=md#impact-score)

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## Description

In Libav through 12.2, there is an invalid memcpy in the av\_packet\_ref
function of libavcodec/avpacket.c. Remote attackers could leverage this
vulnerability to cause a denial of service (segmentation fault) via a
crafted avi file.

[Read the notes from the security team](https://ubuntu.com/security/CVE-2018-5766?format=md#notes)

## Status

Show unmaintained releases

| Package | Ubuntu Release | Status |
| --- | --- | --- |
| libav | 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 |
| 20.04 LTS focal | 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 | Not in release |
| 14.04 LTS trusty | Vulnerable |

---

* [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)

No fix available as of 2019-03-01

## Severity score breakdown

CVSS version:
CVSS v3.0

**Base score**

8.8 · High

* Base metrics

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

  | Parameter | Value |
  | --- | --- |
  | Base score | 8.8 · High |
  | Exploitability score | - |
  | Impact score | - |

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

## References

* [MITRE](https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2018-5766)
* [NVD](https://nvd.nist.gov/vuln/detail/CVE-2018-5766)
* [Launchpad](https://launchpad.net/bugs/cve/CVE-2018-5766)
* [Debian](https://security-tracker.debian.org/tracker/CVE-2018-5766)

### Other references

* <https://bugzilla.libav.org/show_bug.cgi?id=1112>
* <https://www.cve.org/CVERecord?id=CVE-2018-5766>