CVE-2020-12398

high
Published — · Modified —
CVSS v3
CVSS v2
VIR risk
8.0

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.

Predictions

Exploit likelihood
20%
Patch ETA

Heuristic predictions, AS-IS, for prioritization only.

Mitigations

vendor Authored 2026-05-27

Vendor advisory: debian — https://security-tracker.debian.org/tracker/CVE-2020-12398

vendor Authored 2026-05-27

Vendor advisory: arch — https://security.archlinux.org/ASA-202006-4

OS impact

OSVersionStatusFixed in
arch archfixed68.9.0-1
debian debianbookwormfixed1:68.9.0-1
debian debianbullseyefixed1:68.9.0-1
debian debianforkyfixed1:68.9.0-1
debian debiansidfixed1:68.9.0-1
debian debiantrixiefixed1:68.9.0-1

References

Verify integrity in audit chain (admin only). AS-IS.