CVE-2020-28018

NameCVE-2020-28018
DescriptionExim 4 before 4.94.2 allows Use After Free in smtp_reset in certain situations that may be common for builds with OpenSSL.
SourceCVE (at NVD; CERT, LWN, oss-sec, fulldisc, Red Hat, Ubuntu, Gentoo, SUSE bugzilla/CVE, GitHub advisories/code/issues, web search, more)

Vulnerable and fixed packages

The table below lists information on source packages.

Source PackageReleaseVersionStatus
exim4 (PTS)bullseye, bullseye (security)4.94.2-7+deb11u3fixed
bookworm, bookworm (security)4.96-15+deb12u5fixed
sid, trixie4.98-1fixed

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

PackageTypeReleaseFixed VersionUrgencyOriginDebian Bugs
exim4sourcestretch(not affected)
exim4sourcebuster4.92-8+deb10u6
exim4source(unstable)4.94.2-1unimportant

Notes

[stretch] - exim4 <not-affected> (Vulnerable code introduced later)
Introduced by: https://git.exim.org/exim.git/commit/a5ffa9b475a426bc73366db01f7cc92a3811bc3a (exim-4_90_RC1)
Debian Exim is built with GnuTLS, not OpenSSL.
https://www.openwall.com/lists/oss-security/2021/05/04/7

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