CVE-2020-12398

HighCVSS 7.5/10Last modified Jun 17, 2026

Description

If Thunderbird is configured to use STARTTLS for an IMAP server, and the server sends a PREAUTH response, then Thunderbird will continue with an unencrypted connection, causing email data to be sent without protection. This vulnerability affects Thunderbird < 68.9.0.

Metrics

CVSS 3.1 7.5/10CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N

Weakness enumeration

CWE-319

Affected software

Vendor	Product	Versions
Mozilla	Thunderbird	>= unspecified, < 68.9.0

References

https://bugzilla.mozilla.org/show_bug.cgi?id=1613623Issue Tracking, Permissions Required, Vendor Advisory
https://usn.ubuntu.com/4421-1/Third Party Advisory
https://www.mozilla.org/security/advisories/mfsa2020-22/Vendor Advisory
https://bugzilla.mozilla.org/show_bug.cgi?id=1613623Issue Tracking, Permissions Required, Vendor Advisory
https://usn.ubuntu.com/4421-1/Third Party Advisory
https://www.mozilla.org/security/advisories/mfsa2020-22/Vendor Advisory

Timeline

Published: Jul 9, 2020
Last modified: Jun 17, 2026
NVD status: Modified

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