| Name | CVE-2020-28019 |
| Description | Exim 4 before 4.94.2 has Improper Initialization that can lead to recursion-based stack consumption or other consequences. This occurs because use of certain getc functions is mishandled when a client uses BDAT instead of DATA. |
| Source | CVE (at NVD; CERT, LWN, oss-sec, fulldisc, Red Hat, Ubuntu, Gentoo, SUSE bugzilla/CVE, GitHub advisories/code/issues, web search, more) |
| References | DLA-2650-1, DSA-4912-1 |
Vulnerable and fixed packages
The table below lists information on source packages.
| Source Package | Release | Version | Status |
|---|
| exim4 (PTS) | jessie, jessie (lts) | 4.84.2-2+deb8u12 | fixed |
| stretch (security) | 4.89-2+deb9u8 | fixed |
| stretch (lts), stretch | 4.89-2+deb9u13 | fixed |
| buster, buster (lts) | 4.92-8+deb10u10 | fixed |
| buster (security) | 4.92-8+deb10u9 | fixed |
| bullseye | 4.94.2-7+deb11u3 | fixed |
| bullseye (security) | 4.94.2-7+deb11u4 | fixed |
| bookworm | 4.96-15+deb12u6 | fixed |
| bookworm (security) | 4.96-15+deb12u5 | fixed |
| sid, trixie | 4.98-2 | fixed |
The information below is based on the following data on fixed versions.
Notes
Introduced by: https://git.exim.org/exim.git/commit/7e3ce68e68ab9b8906a637d352993abf361554e2 (exim-4_88_RC1)
https://www.openwall.com/lists/oss-security/2021/05/04/7
[jessie] - exim4 <not-affected> (Vulnerability introduced later; no BDAT support yet)