---
title: "CVE-2019-11753\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-2019-11753?format=md
keywords: index, follow
---

# CVE-2019-11753

Publication date 27 September 2019

Last updated 25 August 2025

---

Ubuntu priority

**Medium**

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

## Cvss 3 Severity Score

**7.8 · High**

[Score breakdown](https://ubuntu.com/security/CVE-2019-11753?format=md#impact-score)

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## Description

The Firefox installer allows Firefox to be installed to a custom user
writable location, leaving it unprotected from manipulation by unprivileged
users or malware. If the Mozilla Maintenance Service is manipulated to
update this unprotected location and the updated maintenance service in the
unprotected location has been altered, the altered maintenance service can
run with elevated privileges during the update process due to a lack of
integrity checks. This allows for privilege escalation if the executable
has been replaced locally. <br>\*Note: This attack requires local system
access and only affects Windows. Other operating systems are not
affected.\*. This vulnerability affects Firefox < 69, Firefox ESR < 60.9,
and Firefox ESR < 68.1.

[Read the notes from the security team](https://ubuntu.com/security/CVE-2019-11753?format=md#notes)

## Status

Show unmaintained releases

| Package | Ubuntu Release | Status |
| --- | --- | --- |
| firefox | 24.04 LTS noble | Not affected |
| 23.10 mantic | Not affected |
| 23.04 lunar | Not affected |
| 22.10 kinetic | Not affected |
| 22.04 LTS jammy | Not affected |
| 21.10 impish | Not affected |
| 21.04 hirsute | Not affected |
| 20.10 groovy | Not affected |
| 20.04 LTS focal | Not in release |
| 19.10 eoan | Not affected |
| 19.04 disco | Not affected |
| 18.04 LTS bionic | Not affected |
| 16.04 LTS xenial | Not affected |
| 14.04 LTS trusty | Not in release |
| 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 |
| 18.04 LTS bionic | Ignored |
| 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 | Ignored end of life |
| 20.04 LTS focal | Ignored |
| 19.10 eoan | Ignored end of life |
| 19.04 disco | Ignored end of life |
| 18.04 LTS bionic | Ignored |
| 16.04 LTS xenial | Not in release |
| 14.04 LTS trusty | Not in release |
| mozjs60 | 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 | Ignored end of life |
| 19.04 disco | Ignored end of life |
| 18.04 LTS bionic | 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**

7.8 · High

* Base metrics

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

  | Parameter | Value |
  | --- | --- |
  | Base score | 7.8 · High |
  | Exploitability score | - |
  | Impact score | - |

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

## References

* [MITRE](https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2019-11753)
* [NVD](https://nvd.nist.gov/vuln/detail/CVE-2019-11753)
* [Launchpad](https://launchpad.net/bugs/cve/CVE-2019-11753)
* [Debian](https://security-tracker.debian.org/tracker/CVE-2019-11753)

### Other references

* <https://www.mozilla.org/en-US/security/advisories/mfsa2019-25/#CVE-2019-11753>
* <https://www.cve.org/CVERecord?id=CVE-2019-11753>