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Vulnerability record · CVE-2021-26102 · published 19 December 2024

CVE-2021-26102: Fortinet fortiwan path traversal vulnerability

Fortinet · Fortiwan

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.

9.1 CVSS 3.1 Critical EPSS 20% · top 2.7% CWE-305 · CWE-305CWE-22 · Path traversal
9.1CVSS 3.1 base score
20%EPSS exploitation probability, 30 days
NoNot in CISA KEV
1Affected product versions listed by NVD
1References
17 Jun 2026Last modified by NVD

Description

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.

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:H

Affected products

1 vulnerable configurations from NVD's CPE data, grouped by vendor and product.

References

LinkTags
https://fortiguard.fortinet.com/psirt/FG-IR-21-048 Vendor Advisory

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Related vulnerabilities

Same products first, then exploited flaws of the same weakness class.

9.8CVE-2021-26112Fortinet fortiwan out-of-bounds write vulnerabilityMultiple stack-based buffer overflow vulnerabilities [CWE-121] both in network daemons and in the command line interpreter of FortiWAN before 4.5.9 m…EPSS 1.7%9.8CVE-2021-26114Fortinet fortiwan sql injection vulnerabilityMultiple improper neutralization of special elements used in an SQL command vulnerabilities in FortiWAN before 4.5.9 may allow an unauthenticated att…EPSS 1.6%8.8CVE-2023-44251Fortinet fortiwan path traversal vulnerability** UNSUPPORTED WHEN ASSIGNED **A improper limitation of a pathname to a restricted directory ('path traversal') vulnerability [CWE-22] in Fortinet Fo…EPSS 0.84%8.8CVE-2023-44252Fortinet fortiwan improper authentication vulnerability** UNSUPPORTED WHEN ASSIGNED **An improper authentication vulnerability [CWE-287] in Fortinet FortiWAN version 5.2.0 through 5.2.1 and version 5.1.1 …EPSS 0.72%8.8CVE-2022-33869Fortinet fortiwan os command injection vulnerabilityAn improper neutralization of special elements used in an OS command vulnerability [CWE-78] in the management interface of FortiWAN 4.0.0 through 4.5…EPSS 1.3%8.8CVE-2021-24009Fortinet fortiwan os command injection vulnerabilityMultiple improper neutralization of special elements used in an OS command vulnerabilities (CWE-78) in the Web GUI of FortiWAN before 4.5.9 may allow…EPSS 1.5%8.8CVE-2016-4965Fortinet fortiwan os command injection vulnerabilityFortinet FortiWan (formerly AscernLink) before 4.2.5 allows remote authenticated users with access to the nslookup functionality to execute arbitrary…EPSS 4.1%7.8CVE-2021-26115Fortinet fortiwan os command injection vulnerabilityAn OS command injection (CWE-78) vulnerability in FortiWAN version 4.5.7 and below Command Line Interface may allow a local, authenticated and unpriv…EPSS 0.79%

Source: NIST National Vulnerability Database (record CVE-2021-26102), CISA KEV, FIRST EPSS (scores of 2026-09-26). This page is refreshed as NVD updates the record.