Vulnerability identifier: #VU54776

Vulnerability risk: Medium

CVSSv3.1: 4.6 [CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L/E:U/RL:O/RC:C]

CVE-ID: CVE-2021-26090

CWE-ID: CWE-401

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 perform DoS attack on the target system.

The vulnerability exists due memory leak in FortiMail Webmail. A remote attacker can exhaust available memory resources via specifically crafted login requests.

Mitigation
Install updates from vendor's website.

Vulnerable software versions

Fortinet FortiMail: 6.4.0 - 6.4.4

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External links
http://fortiguard.com/advisory/FG-IR-21-042

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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.