Operation on a Resource after Expiration or Release Affecting firefox package, versions <88.0+build2-0ubuntu0.21.04.1


Severity

Recommended
medium

Based on Ubuntu security rating.

Threat Intelligence

EPSS
0.26% (66th percentile)

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  • Snyk IDSNYK-UBUNTU2104-FIREFOX-1256028
  • published20 Apr 2021
  • disclosed24 Jun 2021

Introduced: 20 Apr 2021

CVE-2021-23995  (opens in a new tab)
CWE-672  (opens in a new tab)

How to fix?

Upgrade Ubuntu:21.04 firefox to version 88.0+build2-0ubuntu0.21.04.1 or higher.

NVD Description

Note: Versions mentioned in the description apply only to the upstream firefox package and not the firefox package as distributed by Ubuntu. See How to fix? for Ubuntu:21.04 relevant fixed versions and status.

When Responsive Design Mode was enabled, it used references to objects that were previously freed. We presume that with enough effort this could have been exploited to run arbitrary code. This vulnerability affects Firefox ESR < 78.10, Thunderbird < 78.10, and Firefox < 88.

CVSS Scores

version 3.1