CVE-2020-28010

Publication date 4 May 2021

Last updated 25 August 2025

Ubuntu priority

Cvss 3 Severity Score

Description

Exim 4 before 4.94.2 allows Out-of-bounds Write because the main function, while setuid root, copies the current working directory pathname into a buffer that is too small (on some common platforms).

Read the notes from the security team

Status

Show unmaintained releases

Package	Ubuntu Release	Status
exim4	22.04 LTS jammy	Fixed 4.94-15ubuntu1.2
	21.10 impish	Fixed 4.94-15ubuntu1.2
	21.04 hirsute	Fixed 4.94-15ubuntu1.2
	20.10 groovy	Fixed 4.94-7ubuntu1.2
	20.04 LTS focal	Fixed 4.93-13ubuntu1.5
	18.04 LTS bionic	Fixed 4.90.1-1ubuntu1.8
	16.04 LTS xenial	Not affected
	14.04 LTS trusty	Not affected

Notes

leosilva

code introduced later, xenial and trusty ESM not affected

Severity score breakdown

Parameter	Value
Base score	7.8 · High
Attack vector	Local
Attack complexity	Low
Privileges required	Low
User interaction	None
Scope	Unchanged
Confidentiality	High
Integrity impact	High
Availability impact	High
Vector	CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H