critical
CVE-2020-28024
Exim 4 before 4.94.2 allows Buffer Underwrite that may result in unaut ...
In the Trivy database since at least 24 Oct 2026, 07:11 UTCWhen it arrived before that build is not recorded.
Severity by source
NVD9.8CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
Trivy's own label is CRITICAL. Rated critical by NVD, Amazon. Rated lower by Ubuntu (medium).
Description
Exim 4 before 4.94.2 allows Buffer Underwrite that may result in unauthenticated remote attackers executing arbitrary commands, because smtp_ungetc was only intended to push back characters, but can actually push back non-character error codes such as EOF.
Affected packages and fixed versions
| Source | Package | Fixed in |
|---|---|---|
| amazon linux 1 | exim, exim-debuginfo, exim-greylist and 3 more | 4.92-1.33.amzn1 |
| alpine 3.13 | exim | 4.94.2-r0 |
| alpine 3.14 | exim | 4.94.2-r0 |
| alpine 3.15 | exim | 4.94.2-r0 |
| alpine 3.16 | exim | 4.94.2-r0 |
| alpine 3.17 | exim | 4.94.2-r0 |
| alpine 3.18 | exim | 4.94.2-r0 |
| alpine 3.19 | exim | 4.94.2-r0 |
| alpine 3.20 | exim | 4.94.2-r0 |
| alpine 3.21 | exim | 4.94.2-r0 |
| alpine 3.22 | exim | 4.94.2-r0 |
| alpine 3.23 | exim | 4.94.2-r0 |
Show all 36 entries from 31 sources
| Source | Package | Fixed in |
|---|---|---|
| amazon linux 1 | exim | 4.92-1.33.amzn1 |
| amazon linux 1 | exim-debuginfo | 4.92-1.33.amzn1 |
| amazon linux 1 | exim-greylist | 4.92-1.33.amzn1 |
| amazon linux 1 | exim-mon | 4.92-1.33.amzn1 |
| amazon linux 1 | exim-mysql | 4.92-1.33.amzn1 |
| amazon linux 1 | exim-pgsql | 4.92-1.33.amzn1 |
| alpine 3.13 | exim | 4.94.2-r0 |
| alpine 3.14 | exim | 4.94.2-r0 |
| alpine 3.15 | exim | 4.94.2-r0 |
| alpine 3.16 | exim | 4.94.2-r0 |
| alpine 3.17 | exim | 4.94.2-r0 |
| alpine 3.18 | exim | 4.94.2-r0 |
| alpine 3.19 | exim | 4.94.2-r0 |
| alpine 3.20 | exim | 4.94.2-r0 |
| alpine 3.21 | exim | 4.94.2-r0 |
| alpine 3.22 | exim | 4.94.2-r0 |
| alpine 3.23 | exim | 4.94.2-r0 |
| alpine 3.24 | exim | 4.94.2-r0 |
| alpine edge | exim | 4.94.2-r0 |
| debian 10 | exim4 | 4.92-8+deb10u6 |
| debian 11 | exim4 | 4.94.2-1 |
| debian 12 | exim4 | 4.94.2-1 |
| debian 13 | exim4 | 4.94.2-1 |
| debian 14 | exim4 | 4.94.2-1 |
| debian 9 | exim4 | 4.89-2+deb9u8 |
| echo | exim4 | 4.94.2-1 |
| ubuntu 14.04-ESM | exim4 | 4.82-3ubuntu2.4+esm3 |
| ubuntu 16.04-ESM | exim4 | 4.86.2-2ubuntu2.6+esm1 |
| ubuntu 18.04 | exim4 | 4.90.1-1ubuntu1.8 |
| ubuntu 18.04-ESM | exim4 | 4.90.1-1ubuntu1.8 |
| ubuntu 20.04 | exim4 | 4.93-13ubuntu1.5 |
| ubuntu 20.04-ESM | exim4 | 4.93-13ubuntu1.5 |
| ubuntu 20.10 | exim4 | 4.94-7ubuntu1.2 |
| ubuntu 21.04 | exim4 | 4.94-15ubuntu1.2 |
| ubuntu 21.10 | exim4 | 4.94-15ubuntu1.2 |
| ubuntu 22.04 | exim4 | 4.94-15ubuntu1.2 |