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CVE-2020-28017

Published: 4 May 2021

Exim 4 before 4.94.2 allows Integer Overflow to Buffer Overflow in receive_add_recipient via an e-mail message with fifty million recipients. NOTE: remote exploitation may be difficult because of resource consumption.

Priority

Medium

Cvss 3 Severity Score

9.8

Score breakdown

Status

Package Release Status
exim4
Launchpad, Ubuntu, Debian
focal
Released (4.93-13ubuntu1.5)
groovy
Released (4.94-7ubuntu1.2)
hirsute
Released (4.94-15ubuntu1.2)
jammy
Released (4.94-15ubuntu1.2)
trusty
Released (4.82-3ubuntu2.4+esm3)
Available with Ubuntu Pro or Ubuntu Pro (Infra-only)
upstream Needs triage

xenial
Released (4.86.2-2ubuntu2.6+esm1)
Available with Ubuntu Pro or Ubuntu Pro (Infra-only)
impish
Released (4.94-15ubuntu1.2)
bionic
Released (4.90.1-1ubuntu1.8)

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