---
title: "CVE-2017-7811\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-2017-7811?format=md
keywords: index, follow
---

# CVE-2017-7811

Publication date 2 October 2017

Last updated 25 August 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-2017-7811?format=md#impact-score)

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## Description

Memory safety bugs were reported in Firefox 55. Some of these bugs showed
evidence of memory corruption and we presume that with enough effort that
some of these could be exploited to run arbitrary code. This vulnerability
affects Firefox < 56.

[Read the notes from the security team](https://ubuntu.com/security/CVE-2017-7811?format=md#notes)

## Status

Show unmaintained releases

| Package | Ubuntu Release | Status |
| --- | --- | --- |
| firefox | 24.04 LTS noble | Fixed 56.0+build6-0ubuntu1 |
| 23.10 mantic | Fixed 56.0+build6-0ubuntu1 |
| 23.04 lunar | Fixed 56.0+build6-0ubuntu1 |
| 22.10 kinetic | Fixed 56.0+build6-0ubuntu1 |
| 22.04 LTS jammy | Fixed 56.0+build6-0ubuntu1 |
| 21.10 impish | Fixed 56.0+build6-0ubuntu1 |
| 21.04 hirsute | Fixed 56.0+build6-0ubuntu1 |
| 20.10 groovy | Fixed 56.0+build6-0ubuntu1 |
| 20.04 LTS focal | Fixed 56.0+build6-0ubuntu1 |
| 19.10 eoan | Fixed 56.0+build6-0ubuntu1 |
| 19.04 disco | Fixed 56.0+build6-0ubuntu1 |
| 18.10 cosmic | Fixed 56.0+build6-0ubuntu1 |
| 18.04 LTS bionic | Fixed 56.0+build6-0ubuntu1 |
| 17.10 artful | Fixed 56.0+build6-0ubuntu1 |
| 17.04 zesty | Fixed 56.0+build6-0ubuntu0.17.04.1 |
| 16.04 LTS xenial | Fixed 56.0+build6-0ubuntu0.16.04.1 |
| 14.04 LTS trusty | Fixed 56.0+build6-0ubuntu0.14.04.1 |
| mozjs38 | 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 | Ignored |
| 17.10 artful | Ignored end of life |
| 17.04 zesty | Ignored end of life |
| 16.04 LTS xenial | Not in release |
| 14.04 LTS trusty | Not in release |
| mozjs52 | 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 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 | Not affected |
| 17.10 artful | Not affected |
| 17.04 zesty | Not in release |
| 16.04 LTS xenial | Not in release |
| 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)

## Notes

---

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

mozjs contains a copy of the SpiderMonkey JavaScript engine

## 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:3.0/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-2017-7811)
* [NVD](https://nvd.nist.gov/vuln/detail/CVE-2017-7811)
* [Launchpad](https://launchpad.net/bugs/cve/CVE-2017-7811)
* [Debian](https://security-tracker.debian.org/tracker/CVE-2017-7811)

### Related Ubuntu Security Notices (USN)

+ [USN-3435-1](https://usn.ubuntu.com/USN-3435-1)
+ Firefox vulnerabilities
+ 2 October 2017

### Other references

* <https://www.mozilla.org/en-US/security/advisories/mfsa2017-21/>
* <https://www.cve.org/CVERecord?id=CVE-2017-7811>