CVE-2021-38502

Name	CVE-2021-38502
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.
Source	CVE (at NVD; CERT, LWN, oss-sec, fulldisc, Red Hat, Ubuntu, Gentoo, SUSE bugzilla/CVE, GitHub advisories/code/issues, web search, more)
References	DLA-2874-1, DSA-5034-1

Vulnerable and fixed packages

The table below lists information on source packages.

Source Package	Release	Version	Status
thunderbird (PTS)	bullseye	1:115.12.0-1~deb11u1	fixed
	bullseye (security)	1:128.4.3esr-1~deb11u1	fixed
	bookworm	1:115.16.0esr-1~deb12u1	fixed
	bookworm (security)	1:128.4.3esr-1~deb12u1	fixed
	sid, trixie	1:128.4.3esr-1	fixed

The information below is based on the following data on fixed versions.

Package	Type	Release	Fixed Version	Origin
thunderbird	source	experimental	1:91.2.0-1
thunderbird	source	stretch	1:91.4.1-1~deb9u1	DLA-2874-1
thunderbird	source	buster	1:91.4.1-1~deb10u1	DSA-5034-1
thunderbird	source	bullseye	1:91.4.1-1~deb11u1	DSA-5034-1
thunderbird	source	(unstable)	1:91.2.1-1

https://www.mozilla.org/en-US/security/advisories/mfsa2021-47/#CVE-2021-38502