Authentication bypass in FortiWAN

Published: 2021-04-28
Risk High
Patch available YES
Number of vulnerabilities 1
CVE ID CVE-2021-26102
Exploitation vector Network
Public exploit N/A
Vulnerable software
Hardware solutions / Routers & switches, VoIP, GSM, etc


Security Advisory

This security advisory describes one high risk vulnerability.

1) Improper Authentication

Risk: High

CVSSv3.1: 8.7 [CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:H/I:H/A:H/E:U/RL:O/RC:C] [PCI]

CVE-ID: CVE-2021-26102

CWE-ID: CWE-287 - Improper Authentication

Exploit availability: No


The vulnerability allows a remote attacker to bypass authentication process.

The vulnerability exists due to an error in the authentication process. A remote non-authenticated attacker can send a specially crafted HTTP POST request and delete arbitrary files on the system using directory traversal sequences. In particular, deleting specific configuration files will reset the Admin password to its default value.

Successful exploitation of the vulnerability may allow an attacker to gain full access to the affected system.


Install updates from vendor's website.

Vulnerable software versions

FortiWAN: before 5.1.1

CPE 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.