CVE-2020-12406

HIGH

Firefox < 77.0 - Memory Corruption via Unboxed Object Type Confusion

Title source: manual
STIX 2.1

Description

Mozilla Developer Iain Ireland discovered a missing type check during unboxed objects removal, resulting in a crash. We presume that with enough effort that it could be exploited to run arbitrary code. This vulnerability affects Thunderbird < 68.9.0, Firefox < 77, and Firefox ESR < 68.9.

References (5)

Core 5
Core References
Issue Tracking, Vendor Advisory x_refsource_misc
https://bugzilla.mozilla.org/show_bug.cgi?id=1639590
Third Party Advisory vendor-advisory x_refsource_ubuntu
https://usn.ubuntu.com/4421-1/

Scores

CVSS v3 8.8
EPSS 0.0035
EPSS Percentile 57.8%
Attack Vector NETWORK
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H

Details

CWE
CWE-345
Status published
Products (7)
canonical/ubuntu_linux 16.04
canonical/ubuntu_linux 18.04
canonical/ubuntu_linux 19.10
canonical/ubuntu_linux 20.04
mozilla/firefox < 77.0
mozilla/firefox_esr < 68.9.0
mozilla/thunderbird < 68.9.0
Published Jul 09, 2020
Tracked Since Feb 18, 2026