A relative path traversal vulnerability (CWE-23) in FortiWAN version 4.5.7 and below, 4.4 all versions may allow a remote non-authenticated…

published 2024-12-19 22 mo ago modified 2026-06-17 4 mo ago also EUVD-2021-12923

cvss: 9.8; version 3.1, CNA
cisa kev: Not listed; not in CISA's catalog
epss: 19.7%; EPSS 19.7% chance of exploitation in 30 days, percentile 97%
public exploits: 0; none known

A relative path traversal vulnerability (CWE-23) in FortiWAN version 4.5.7 and below, 4.4 all versions may allow a remote non-authenticated attacker to delete files on the system by sending a crafted POST request. In particular, deleting specific configuration files will reset the Admin password to its default value.

Patch / fix

fixed in 1

fortinet fortiwan 4.5.8

CISA SSVC

Exploitation: none
Automatable: yes
Technical impact: total
Assessed: 22 mo ago (2024-12-19)

Exploit prediction

19.72% chance of exploitation in the next 30 days, higher than 97% of all scored CVEs (FIRST EPSS, 2026-11-08).

CVSS scores

assigned by	version	score	vector
CNA	3.1	9.8	CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H/E:H/RL:U/RC:C
CNA	3.1	9.8	CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
NVD	3.1	9.1	CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:H

Affected products

Fortinet FortiWAN

Classification

Weakness

CWE-305 Authentication Bypass by Primary Weakness
CWE-22 Improper Limitation of a Pathname to a Restricted Directory

Technology feeds

Fortinet rss critical rss

References

fortiguard.fortinet.com /psirt/FG-IR-21-048
vendor-advisory

Sources

CVE List CVE-2021-26102
NVD CVE-2021-26102

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Summary