CVE-2020-6822
Mozilla: Out of bounds write in GMPDecodeData when processing large images
Severity
ModerateRed Hat Product Security
CVSS 3.1
Review impact separately from score.
Published · April 8, 2020
Updated · November 22, 2025
Description
The Mozilla Foundation Security Advisory describes this flaw as:
On 32-bit builds, an out of bounds write could have occurred when processing an image larger than 4 GB in GMPDecodeData. It is possible that with enough effort this could have been exploited to run arbitrary code.
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 · 8.8CVSS: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