#VU54790 Missing Required Cryptographic Step in Fortinet FortiMail - CVE-2021-26100

Vulnerability identifier: #VU54790

Vulnerability risk: Medium

CVSSv4.0: 4.6 [CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:H/VI:N/VA:N/SC:N/SI:N/SA:N/E:U/U:Green]

CVE-ID: CVE-2021-26100

CWE-ID: CWE-325

Exploitation vector: Network

Exploit availability: No

Vulnerable software:
Fortinet FortiMail
Server applications / IDS/IPS systems, Firewalls and proxy servers

Vendor: Fortinet, Inc

Description

The vulnerability allows a remote attacker to gain access to sensitive information.

The vulnerability exists due to a missing cryptographic step in FortiMail IBE. A remote attacker who intercepts the encrypted messages can manipulate them in such a way that makes the tampering and the recovery of the plaintexts possible.

Mitigation
Install updates from vendor's website.

Vulnerable software versions

Fortinet FortiMail: 5.0 - 6.4.4

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External links
https://fortiguard.com/advisory/FG-IR-21-003

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Q & A

Can this vulnerability be exploited remotely?

Yes. This vulnerability can be exploited by a remote non-authenticated attacker via the Internet.

Is there known malware, which exploits this vulnerability?

No. We are not aware of malware exploiting this vulnerability.