Is CVE-2021-26102 in the CISA KEV catalog?

No. CVE-2021-26102 is not currently on the CISA Known Exploited Vulnerabilities list.

What is the CVSS severity of CVE-2021-26102?

CVE-2021-26102 has a CVSS v3 base score of 9.8 (CRITICAL).

What is the EPSS score for CVE-2021-26102?

CVE-2021-26102 has an EPSS score of 16.36% (97th percentile), estimating the probability of exploitation in the next 30 days.

How do I fix CVE-2021-26102?

Upgrade fortiwan to 4.5.8 or later.

CVE & CISA-KEV Catalog

CVE-2021-26102

CRITICALEPSS 97th pctl

9.8

CVSS v3

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.

CWE-305 CWE-22Path Traversal

How to fix

Remediation Available

fortiwanNVD

Affected:>= 4.4.0, < 4.5.8Fixed in:4.5.8CVE-2021-26102derived from NVD

TridentStack Control can deploy fixes like this automatically across your Windows, macOS, and Linux fleet. See how it works

Remediation is compiled from vendor and distribution security advisories. Always confirm against the linked source for your exact version and platform.

CVSS v3 Vector

Exploitability

Attack VectorNetwork

Attack ComplexityLow

Privileges RequiredNone

User InteractionNone

ScopeUnchanged

Impact

ConfidentialityHigh

IntegrityHigh

AvailabilityHigh

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

Exploit Intelligence

16.36%probability of exploitation in 30 days

97thpercentile

Very high risk: more likely to be exploited than 97% of all known CVEs.

References

Vendor Advisory1

fortiguard.fortinet.com

Related Vulnerabilities

Other CWE-305 vulnerabilities, ordered by exploit likelihood. View all

CVE	Severity	CVSS	EPSS	Exploited	Fix
CVE-2025-31161	Critical	9.8	100%	KEV + Ransom	Fix
CVE-2020-10923	High	8.8	85%	-	-
CVE-2023-28126	Medium	5.9	67%	-	-
CVE-2023-34124	Critical	9.8	45%	-	Fix
CVE-2024-37085	Medium	6.8	27%	KEV + Ransom	Fix
CVE-2025-32011	Critical	9.8	22%	-	-

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This product uses NVD data but is not endorsed or certified by the NVD. EPSS scores courtesy of FIRST.org (https://www.first.org/epss). Source: CISA KEV Catalog. Data as of 2025-01-21.