| Name | CVE-2020-28018 |
| Description | Exim 4 before 4.94.2 allows Use After Free in smtp_reset in certain situations that may be common for builds with OpenSSL. |
| Source | CVE (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 Package | Release | Version | Status |
|---|
| exim4 (PTS) | buster | 4.92-8+deb10u6 | fixed |
| buster (security) | 4.92-8+deb10u9 | fixed |
| bullseye, bullseye (security) | 4.94.2-7+deb11u2 | fixed |
| bookworm, bookworm (security) | 4.96-15+deb12u4 | fixed |
| trixie | 4.97-5 | fixed |
| sid | 4.97-8 | fixed |
The information below is based on the following data on fixed versions.
| Package | Type | Release | Fixed Version | Urgency | Origin | Debian Bugs |
|---|
| exim4 | source | stretch | (not affected) | | | |
| exim4 | source | buster | 4.92-8+deb10u6 | | | |
| exim4 | source | (unstable) | 4.94.2-1 | unimportant | | |
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