CVE-2020-12397

MEDIUM 4.3CVE-2020-12397 · Published 22/05/2020 · updated 17/06/2026

In short

CVE-2020-12397 is a MEDIUM (CVSS 4.3) vulnerability affecting thunderbird (mozilla).
Chance of exploitation in the next 30 days (EPSS): 0.61%, higher than 49.5% of all vulnerabilities.
Fix: update to 68.8.0 or later.

Package	Affected versions	Patched versions
thunderbird mozilla	`< 68.8.0`	`68.8.0`

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.

References

bugzilla.mozilla.org/show_bug.cgi · Issue Tracking
security.gentoo.org/glsa/202005-03 · Third Party Advisory
usn.ubuntu.com/4373-1 · Third Party Advisory
mozilla.org/security/advisories/mfsa2020-18 · Vendor Advisory

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Package

Affected versions

Patched versions

thunderbird

mozilla

< 68.8.0

68.8.0

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