What is CVE-2021-36166?

CVE-2021-36166 is an improper authentication vulnerability in FortiMail before 7.0.1 that allows a remote attacker to guess an administrative account's authentication token.

How can a remote attacker exploit CVE-2021-36166?

A remote attacker can exploit CVE-2021-36166 by observing certain system properties to efficiently guess an administrative account's authentication token.

Which versions of FortiMail are affected by CVE-2021-36166?

FortiMail versions 5.4.12, 6.0.x (up to and excluding 6.0.12), 6.2.x (up to and excluding 6.2.8), 6.4.x (up to and excluding 6.4.6), and 7.0.0 are affected by CVE-2021-36166.

What is the severity of CVE-2021-36166?

CVE-2021-36166 has a severity rating of critical with a CVSS score of 9.8.

How do I fix CVE-2021-36166?

To fix CVE-2021-36166, it is recommended to upgrade FortiMail to version 7.0.1 or later.

Vulnerability/
CVE-2021-36166

critical

9.8

CWE

330

1/3/2022

25/10/2024

CVE-2021-36166

First published: Tue Mar 01 2022(Updated: )

An improper authentication vulnerability in FortiMail before 7.0.1 may allow a remote attacker to efficiently guess one administrative account's authentication token by means of the observation of certain system's properties.

Credit: psirt@fortinet.com

Affected Software	Affected Version	How to fix
Fortinet FortiMail	<=5.4.12
Fortinet FortiMail	>=6.0.0<6.0.12
Fortinet FortiMail	>=6.2.0<6.2.8
Fortinet FortiMail	>=6.4.0<6.4.6
Fortinet FortiMail	=7.0.0

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Reference Links

https://fortiguard.com/psirt/FG-IR-21-028

Frequently Asked Questions

What is CVE-2021-36166?
CVE-2021-36166 is an improper authentication vulnerability in FortiMail before 7.0.1 that allows a remote attacker to guess an administrative account's authentication token.
How can a remote attacker exploit CVE-2021-36166?
A remote attacker can exploit CVE-2021-36166 by observing certain system properties to efficiently guess an administrative account's authentication token.
Which versions of FortiMail are affected by CVE-2021-36166?
FortiMail versions 5.4.12, 6.0.x (up to and excluding 6.0.12), 6.2.x (up to and excluding 6.2.8), 6.4.x (up to and excluding 6.4.6), and 7.0.0 are affected by CVE-2021-36166.
What is the severity of CVE-2021-36166?
CVE-2021-36166 has a severity rating of critical with a CVSS score of 9.8.
How do I fix CVE-2021-36166?
To fix CVE-2021-36166, it is recommended to upgrade FortiMail to version 7.0.1 or later.

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agent/severity
agent/references
agent/author
agent/tags
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agent/last-modified-date
agent/softwarecombine
agent/first-publish-date
collector/mitre-cve
source/MITRE
vendor/fortinet
canonical/fortinet fortimail
version/fortinet fortimail/5.4.12
version/fortinet fortimail/6.0.0
version/fortinet fortimail/6.2.0
version/fortinet fortimail/6.4.0
version/fortinet fortimail/7.0.0

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