CVEvulnerability
CVE-2021-38502
5.9 MEDIUM
Official page ↗
- Status
- Modified
- Published
- 2021-11-03
- Last modified
- 2026-06-17
- Assigner
- [email protected]
- CVSS 3.1 ([email protected])
- 5.9 MEDIUM — CVSS:3.1/AV:N/AC:H/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
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.
Affected configurations
• mozilla thunderbird (< 91.2)
• debian debian linux 9.0
• debian debian linux 10.0
• debian debian linux 11.0
References
- https://bugzilla.mozilla.org/show_bug.cgi?id=1733366 Issue Tracking, Permissions Required, Vendor Advisory
- https://lists.debian.org/debian-lts-announce/2022/01/msg00001.html Mailing List, Third Party Advisory
- https://www.debian.org/security/2022/dsa-5034 Issue Tracking, Third Party Advisory
- https://www.mozilla.org/security/advisories/mfsa2021-47/ Vendor Advisory
- https://bugzilla.mozilla.org/show_bug.cgi?id=1733366 Issue Tracking, Permissions Required, Vendor Advisory
- https://lists.debian.org/debian-lts-announce/2022/01/msg00001.html Mailing List, Third Party Advisory
- https://www.debian.org/security/2022/dsa-5034 Issue Tracking, Third Party Advisory
- https://www.mozilla.org/security/advisories/mfsa2021-47/ Vendor Advisory