CVE-2020-12398
Publication date 9 June 2020
Last updated 25 August 2025
Ubuntu priority
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.
Status
| Package | Ubuntu Release | Status |
|---|---|---|
| thunderbird | 20.04 LTS focal |
Fixed 1:68.10.0+build1-0ubuntu0.20.04.1
|
| 18.04 LTS bionic |
Fixed 1:68.10.0+build1-0ubuntu0.18.04.1
|
|
| 16.04 LTS xenial |
Fixed 1:68.10.0+build1-0ubuntu0.16.04.1
|
|
| 14.04 LTS trusty | Not in release |
Severity score breakdown
| Parameter | Value |
|---|---|
| Base score |
7.5 · High
|
| Attack vector | Network |
| Attack complexity | Low |
| Privileges required | None |
| User interaction | None |
| Scope | Unchanged |
| Confidentiality | High |
| Integrity impact | None |
| Availability impact | None |
| Vector | CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N |
References
Related Ubuntu Security Notices (USN)
- USN-4421-1
- Thunderbird vulnerabilities
- 8 July 2020