CVE-2021-38502

medium

Description

Thunderbird ignored the configuration to require STARTTLS security for an SMTP connection. A MITM could perform a downgrade attack to intercept transmitted messages, or could take control of the authenticated session to execute SMTP commands chosen by the MITM. If an unprotected authentication method was configured, the MITM could obtain the authentication credentials, too. This vulnerability affects Thunderbird < 91.2.

References

https://bugzilla.mozilla.org/show_bug.cgi?id=1733366

https://www.mozilla.org/security/advisories/mfsa2021-47/

https://www.debian.org/security/2022/dsa-5034

https://lists.debian.org/debian-lts-announce/2022/01/msg00001.html

Details

Source: MITRE

Published: 2021-11-03

Updated: 2022-07-12

Risk Information

CVSS v2

Base Score: 4.3

Vector: AV:N/AC:M/Au:N/C:P/I:N/A:N

Impact Score: 2.9

Exploitability Score: 8.6

Severity: MEDIUM

CVSS v3

Base Score: 5.9

Vector: CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:N/A:N

Impact Score: 3.6

Exploitability Score: 2.2

Severity: MEDIUM