Vulnerability identifier: #VU84878

Vulnerability risk: Medium

CVSSv3.1: 6.4 [CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:N/E:U/RL:O/RC:C]

CVE-ID: CVE-2021-42761

CWE-ID: CWE-384

Exploitation vector: Network

Exploit availability: No

Vulnerable software:
Fortinet FortiWeb
Server applications / Remote management servers, RDP, SSH

Vendor: Fortinet, Inc

Description

The vulnerability allows a remote attacker to compromise the affected system.

The vulnerability exists due to usage of weak session identifiers in FortiWeb. A remote attacker can infer the session identifier of other users and possibly usurp their session.

Mitigation
Install updates from vendor's website.

Vulnerable software versions

Fortinet FortiWeb: 6.4.0 - 6.4.3, 6.3.0 - 6.3.16, 6.2.0 - 6.2.6, 5.7.0 - 5.7.3, 5.8.0 - 5.8.7, 6.0.0 - 6.0.7, 6.1.0 - 6.1.2, 5.9.0 - 5.9.1, 5.6.0 - 5.6.2

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External links
http://www.fortiguard.com/psirt/FG-IR-21-214

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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.