CVE-2020-12397

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CVSS 3.1

4.3 medium

EPSS

<1%p47

Published

May 22, 2020 (May 22, 2020)

Modified

Jun 17, 2026

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.

Vendors: mozilla canonical
Products: thunderbird, ubuntu linux
Weakness: CWE-346
Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:L/A:N

NVD CVE.org GitHub PoCs EPSS (0.6%)

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