CVE-2020-12389

CriticalCVSS 10.0/10Last modified Jun 17, 2026

Description

The Firefox content processes did not sufficiently lockdown access control which could result in a sandbox escape. *Note: this issue only affects Firefox on Windows operating systems.*. This vulnerability affects Firefox ESR < 68.8 and Firefox < 76.

Metrics

CVSS 3.1 10.0/10CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:H/I:H/A:H

Weakness enumeration

CWE-20

Affected software

No affected versions have been published.

Timeline

Published: May 26, 2020
Last modified: Jun 17, 2026
NVD status: Modified

Related CVEs from 2020

CVE-2020-12398.8A memory corruption vulnerability exists when Windows Media Foundation improperly handles objects in memory, aka 'Media Foundation Memory Co CVE-2020-123909.8Incorrect origin serialization of URLs with IPv6 addresses could lead to incorrect security checks. This vulnerability affects Firefox < 76.CVE-2020-123917.5Documents formed using data: URLs in an OBJECT element failed to inherit the CSP of the creating context. This allowed the execution of scri CVE-2020-123925.5The 'Copy as cURL' feature of Devtools' network tab did not properly escape the HTTP POST data of a request, which can be controlled by the CVE-2020-123937.8The 'Copy as cURL' feature of Devtools' network tab did not properly escape the HTTP method of a request, which can be controlled by the web CVE-2020-123943.3A logic flaw in our location bar implementation could have allowed a local attacker to spoof the current location by selecting a different o CVE-2020-123959.8Mozilla developers and community members reported memory safety bugs present in Firefox 75 and Firefox ESR 68.7. Some of these bugs showed e CVE-2020-123969.8Mozilla developers and community members reported memory safety bugs present in Firefox 75. Some of these bugs showed evidence of memory cor CVE-2020-123974.3By encoding Unicode whitespace characters within the From email header, an attacker can spoof the sender email address that Thunderbird disp CVE-2020-123987.5If Thunderbird is configured to use STARTTLS for an IMAP server, and the server sends a PREAUTH response, then Thunderbird will continue wit CVE-2020-123994.4NSS has shown timing differences when performing DSA signatures, which was exploitable and could eventually leak private keys. This vulnerab CVE-2020-12408.8A remote code execution vulnerability exists in Microsoft Excel software when the software fails to properly handle objects in memory, aka '