CVEvulnerability
CVE-2020-12398
7.5 HIGH
Official page ↗
- Status
- Modified
- Published
- 2020-07-09
- Last modified
- 2026-06-17
- Assigner
- [email protected]
- CVSS 3.1 ([email protected])
- 7.5 HIGH — CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N
- CVSS 2.0 ([email protected])
- 4.3 MEDIUM — AV:N/AC:M/Au:N/C:P/I:N/A:N
- Weaknesses
- CWE-319
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.
Affected configurations
• mozilla thunderbird (< 68.9.0)
• canonical ubuntu linux 16.04
• canonical ubuntu linux 18.04
• canonical ubuntu linux 19.10
• canonical ubuntu linux 20.04
Related
Weakness · CWE (1)
- CWE-319 Cleartext Transmission of Sensitive Information weakness
References
- https://bugzilla.mozilla.org/show_bug.cgi?id=1613623 Issue 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=1613623 Issue Tracking, Permissions Required, Vendor Advisory
- https://usn.ubuntu.com/4421-1/ Third Party Advisory
- https://www.mozilla.org/security/advisories/mfsa2020-22/ Vendor Advisory