CVE-2020-28013
Publication date 4 May 2021
Last updated 25 August 2025
Ubuntu priority
Description
Exim 4 before 4.94.2 allows Heap-based Buffer Overflow because it mishandles "-F '.('" on the command line, and thus may allow privilege escalation from any user to root. This occurs because of the interpretation of negative sizes in strncpy.
Status
| Package | Ubuntu Release | Status |
|---|---|---|
| exim4 | 22.04 LTS jammy |
Fixed 4.94-15ubuntu1.2
|
| 20.04 LTS focal |
Fixed 4.93-13ubuntu1.5
|
|
| 18.04 LTS bionic |
Fixed 4.90.1-1ubuntu1.8
|
|
| 16.04 LTS xenial |
Fixed 4.86.2-2ubuntu2.6+esm1
|
|
| 14.04 LTS trusty |
Fixed 4.82-3ubuntu2.4+esm3
|
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CVSS version: CVSS v3.0
Base score
7.8 · High
Vector: CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
References
Related Ubuntu Security Notices (USN)
- USN-4934-1
- Exim vulnerabilities
- 4 May 2021
- USN-4934-2
- Exim vulnerabilities
- 6 May 2021