CVE-2020-12417

Mozilla: Memory corruption due to missing sign-extension for ValueTags on ARM64

Loading…

Severity

Important

Red Hat Product Security

8.8

CVSS 3.1

Review impact separately from score.

Published · June 30, 2020

Updated · November 22, 2025

Description

The Mozilla Foundation Security Advisory describes this flaw as:

Due to confusion about ValueTags on JavaScript Objects, an object may pass through the type barrier, resulting in memory corruption and a potentially exploitable crash.

Statement

This vulnerability only affects Firefox on ARM64/aarch64 platforms. Other architectures are not affected.

CVSS score applicability

The CVSS score(s) listed for this vulnerability do not reflect the associated product's status, and are included for informational purposes to better understand the severity of this vulnerability.

Mitigation

No mitigation is specified in collected source.

CVSS / CWE

CVSS 3.1 · 8.8
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H

CWE-119 · Improper Restriction of Operations within the Bounds of a Memory Buffer