#VU54787 Missing required cryptographic step

Published: 2021-07-13

Vulnerability identifier: #VU54787

Vulnerability risk: High

CVSSv3.1: 7.1 [CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H/E:U/RL:O/RC:C]

CVE-ID: CVE-2021-24020


Exploitation vector: Network

Exploit availability: No

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

Vendor: Fortinet, Inc


The vulnerability allows a remote attacker to bypass signature verification.

The vulnerability exists due to a missing cryptographic step in the implementation of the hash digest algorithm in FortiMail. A remote non-authenticated attacker can tamper with signed URLs by appending further data which allows bypass of signature verification.

Install updates from vendor's website.

Vulnerable software versions

Fortinet FortiMail: 6.2.0 - 6.4.4


External links

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.

Latest bulletins with this vulnerability