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CVE-2020-28020

Published: 4 May 2021

Exim 4 before 4.92 allows Integer Overflow to Buffer Overflow, in which an unauthenticated remote attacker can execute arbitrary code by leveraging the mishandling of continuation lines during header-length restriction.

Priority

Medium

Cvss 3 Severity Score

9.8

Score breakdown

Status

Package Release Status
exim4
Launchpad, Ubuntu, Debian
bionic
Released (4.90.1-1ubuntu1.8)
focal Not vulnerable
(4.93-13ubuntu1.1)
groovy Not vulnerable
(4.94-7ubuntu1)
hirsute Not vulnerable
(4.94-15ubuntu1)
impish Not vulnerable
(4.94-15ubuntu1)
jammy Not vulnerable
(4.94-15ubuntu1)
upstream
Released (4.92)
trusty
Released (4.82-3ubuntu2.4+esm3)
Available with Ubuntu Pro or Ubuntu Pro (Infra-only)
xenial
Released (4.86.2-2ubuntu2.6+esm1)
Available with Ubuntu Pro or Ubuntu Pro (Infra-only)
Patches:
upstream: https://github.com/Exim/exim/commit/56ac062a3ff94fc4e1bbfc2293119c079a4e980b

Severity score breakdown

Parameter Value
Base score 9.8
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