CVE-2021-36386

Name	CVE-2021-36386
Description	report_vbuild in report.c in Fetchmail before 6.4.20 sometimes omits initialization of the vsnprintf va_list argument, which might allow mail servers to cause a denial of service or possibly have unspecified other impact via long error messages. NOTE: it is unclear whether use of Fetchmail on any realistic platform results in an impact beyond an inconvenience to the client user.
Source	CVE (at NVD; CERT, LWN, oss-sec, fulldisc, bugtraq, EDB, Metasploit, Red Hat, Ubuntu, Gentoo, SUSE bugzilla/CVE, Mageia, GitHub advisories/code/issues, web search, more)

Vulnerable and fixed packages

The table below lists information on source packages.

Source Package	Release	Version	Status
fetchmail (PTS)	buster	6.4.0~beta4-3+deb10u1	vulnerable
	bullseye	6.4.16-4+deb11u1	fixed
	bookworm, sid	6.4.37-1	fixed

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

Package	Type	Release	Fixed Version	Urgency	Origin	Debian Bugs
fetchmail	source	(unstable)	6.4.16-4	unimportant

Notes

https://www.fetchmail.info/fetchmail-SA-2021-01.txt
Fixed by: https://gitlab.com/fetchmail/fetchmail/-/commit/c546c8299243a10a7b85c638e0e61396ecd5d8b5 (RELEASE_6-4-20)
Regression fix: https://gitlab.com/fetchmail/fetchmail/-/commit/d3db2da1d13bd2419370ad96defb92eecb17064c (RELEASE_6-4-21)
Negligible security impact