CVE-2021-36386

NameCVE-2021-36386
Descriptionreport_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.
SourceCVE (at NVD; CERT, LWN, oss-sec, fulldisc, bugtraq, EDB, Metasploit, Red Hat, Ubuntu, Gentoo, SUSE bugzilla/CVE, Mageia, GitHub code/issues, web search, more)
NVD severitymedium

Vulnerable and fixed packages

The table below lists information on source packages.

Source PackageReleaseVersionStatus
fetchmail (PTS)stretch6.3.26-3vulnerable
buster6.4.0~beta4-3+deb10u1vulnerable
bullseye6.4.16-4fixed
bookworm, sid6.4.22-1fixed

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

PackageTypeReleaseFixed VersionUrgencyOriginDebian Bugs
fetchmailsource(unstable)6.4.16-4unimportant

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

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