CVE-2021-26102

Fortinet Fortiwan path traversal

9.8 CRITICALEPSS 19.7%

Published19 Dec 2024

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 breakdown

Attack vectorNetwork

Attack complexityLow

Privileges requiredNone

User interactionNone

ScopeUnchanged

ConfidentialityHigh

IntegrityHigh

AvailabilityHigh

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

Affected products

Fortinet Fortiwan≥ 4.4.0 < 4.5.8

Remediation

Fixed in

Fortinet Fortiwan≥ 4.5.8

Frequently asked

Is CVE-2021-26102 being actively exploited?

CVE-2021-26102 is not in the CISA KEV catalog. Its EPSS exploit probability is 19.7%.

How severe is CVE-2021-26102?

CVE-2021-26102 has a CVSS 3.1 base score of 9.8, rated critical. EPSS estimates a 19.7% probability of exploitation.

Which products are affected by CVE-2021-26102?

Affected products include Fortinet Fortiwan.

How do I fix CVE-2021-26102?

Upgrade affected software to a fixed version, for example Fortinet Fortiwan 4.5.8 or later, then confirm no affected versions remain in your inventory.

How Secuno handles this

Secuno correlates vulnerabilities like CVE-2021-26102 against the real software inventory on every managed device, every day. Rather than a static severity, each match is scored in context: exploit availability, EPSS, the asset's exposure, and business criticality decide where it lands in the queue. If an affected version is present anywhere across your portfolio, it surfaces automatically with a prioritised remediation path.

See how prioritisation works Book a demo

Data from the NVD, CISA KEV catalog and FIRST EPSS. CVSS 3.1 base score shown where available.