CVE-2020-28021

Publication date 4 May 2021

Last updated 24 July 2024

Ubuntu priority

Cvss 3 Severity Score

Exim 4 before 4.94.2 has Improper Neutralization of Line Delimiters. An authenticated remote SMTP client can insert newline characters into a spool file (which indirectly leads to remote code execution as root) via AUTH= in a MAIL FROM command.

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	Fixed 4.86.2-2ubuntu2.6+esm1 Ubuntu Pro
	14.04 LTS trusty	Fixed 4.82-3ubuntu2.4+esm3 Ubuntu Pro

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Notes

leosilva

fix is same as CVE-2020-28015

Severity score breakdown

Parameter	Value
Base score	8.8 · High
Attack vector	Network
Attack complexity	Low
Privileges required	Low
User interaction	None
Scope	Unchanged
Confidentiality	High
Integrity impact	High
Availability impact	High
Vector	CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H