CVE-2020-28024

2021-05-0400:00:00

ubuntu.com

9.8 High

CVSS3

Attack Vector

NETWORK

Attack Complexity

LOW

Privileges Required

NONE

User Interaction

NONE

Scope

UNCHANGED

Confidentiality Impact

HIGH

Integrity Impact

HIGH

Availability Impact

HIGH

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

7.5 High

CVSS2

Access Vector

NETWORK

Access Complexity

LOW

Authentication

NONE

Confidentiality Impact

PARTIAL

Integrity Impact

PARTIAL

Availability Impact

PARTIAL

AV:N/AC:L/Au:N/C:P/I:P/A:P

0.005 Low

EPSS

Percentile

76.5%

JSON

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.

OSVersionArchitecturePackageVersionFilename
ubuntu18.04noarchexim4< 4.90.1-1ubuntu1.8UNKNOWN
ubuntu20.04noarchexim4< 4.93-13ubuntu1.5UNKNOWN
ubuntu20.10noarchexim4< 4.94-7ubuntu1.2UNKNOWN
ubuntu21.04noarchexim4< 4.94-15ubuntu1.2UNKNOWN
ubuntu21.10noarchexim4< 4.94-15ubuntu1.2UNKNOWN
ubuntu22.04noarchexim4< 4.94-15ubuntu1.2UNKNOWN
ubuntu14.04noarchexim4< 4.82-3ubuntu2.4+esm3) Available with Ubuntu Pro or Ubuntu Pro (Infra-onlyUNKNOWN
ubuntu16.04noarchexim4< 4.86.2-2ubuntu2.6+esm1) Available with Ubuntu Pro or Ubuntu Pro (Infra-onlyUNKNOWN

OS	Version	Architecture	Package	Version	Filename
ubuntu	18.04	noarch	exim4	< 4.90.1-1ubuntu1.8	UNKNOWN
ubuntu	20.04	noarch	exim4	< 4.93-13ubuntu1.5	UNKNOWN
ubuntu	20.10	noarch	exim4	< 4.94-7ubuntu1.2	UNKNOWN
ubuntu	21.04	noarch	exim4	< 4.94-15ubuntu1.2	UNKNOWN
ubuntu	21.10	noarch	exim4	< 4.94-15ubuntu1.2	UNKNOWN
ubuntu	22.04	noarch	exim4	< 4.94-15ubuntu1.2	UNKNOWN
ubuntu	14.04	noarch	exim4	< 4.82-3ubuntu2.4+esm3) Available with Ubuntu Pro or Ubuntu Pro (Infra-only	UNKNOWN
ubuntu	16.04	noarch	exim4	< 4.86.2-2ubuntu2.6+esm1) Available with Ubuntu Pro or Ubuntu Pro (Infra-only	UNKNOWN