CVE-2021-3657

Name	CVE-2021-3657
Description	A flaw was found in mbsync versions prior to 1.4.4. Due to inadequate handling of extremely large (>=2GiB) IMAP literals, malicious or compromised IMAP servers, and hypothetically even external email senders, could cause several different buffer overflows, which could conceivably be exploited for remote code execution.
Source	CVE (at NVD; CERT, LWN, oss-sec, fulldisc, bugtraq, EDB, Metasploit, Red Hat, Ubuntu, Gentoo, SUSE bugzilla/CVE, Mageia, GitHub code/issues, web search, more)
References	DLA-3066-1

Vulnerable and fixed packages

The table below lists information on source packages.

Source Package	Release	Version	Status
isync (PTS)	buster	1.3.0-2.2~deb10u1	vulnerable
	bullseye	1.3.0-2.2+deb11u1	fixed
	bookworm, sid	1.4.4-3	fixed

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

Package	Type	Release	Fixed Version	Origin
isync	source	stretch	1.2.1-2+deb9u1	DLA-3066-1
isync	source	bullseye	1.3.0-2.2+deb11u1
isync	source	(unstable)	1.4.4-1

[buster] - isync <no-dsa> (Minor issue)
https://www.openwall.com/lists/oss-security/2021/12/03/1