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CVE-2020-28024

Publication date 4 May 2021

Last updated 24 July 2024

Ubuntu priority

Medium

Why this priority?

Cvss 3 Severity Score

9.8 · Critical

Score breakdown

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.

Status

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
14.04 LTS trusty

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Severity score breakdown

Parameter Value
Base score 9.8 · Critical
Attack vector Network
Attack complexity Low
Privileges required None
User interaction None
Scope Unchanged
Confidentiality High
Integrity impact High
Availability impact High
Vector CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

References

Related Ubuntu Security Notices (USN)

Other references