CVE-2020-12397

Mozilla: Sender Email Address Spoofing using encoded Unicode characters

Loading…

Severity

Low

Red Hat Product Security

4.3

CVSS 3.1

Review impact separately from score.

Published · May 5, 2020

Updated · November 22, 2025

Description

By encoding Unicode whitespace characters within the From email header, an attacker can spoof the sender email address that Thunderbird displays. This vulnerability affects Thunderbird < 68.8.0.

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 · 4.3
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:L/A:N

CWE-172 · Encoding Error