Is CVE-2025-59718 in the CISA KEV catalog?

Yes. CVE-2025-59718 is on the CISA Known Exploited Vulnerabilities list, added 2025-12-16.

What is the CVSS severity of CVE-2025-59718?

CVE-2025-59718 has a CVSS v3 base score of 9.8 (CRITICAL).

What is the EPSS score for CVE-2025-59718?

CVE-2025-59718 has an EPSS score of 66.32% (99th percentile), estimating the probability of exploitation in the next 30 days.

How do I fix CVE-2025-59718?

Upgrade fortios to 7.6.4 or later. Fixes are available for 3 affected products.

CVE & CISA-KEV Catalog

CVE-2025-59718

CRITICALCISA KEVEPSS 99th pctl

9.8

CVSS v3

NVD

Description

A improper verification of cryptographic signature vulnerability in Fortinet FortiOS 7.6.0 through 7.6.3, FortiOS 7.4.0 through 7.4.8, FortiOS 7.2.0 through 7.2.11, FortiOS 7.0.0 through 7.0.17, FortiProxy 7.6.0 through 7.6.3, FortiProxy 7.4.0 through 7.4.10, FortiProxy 7.2.0 through 7.2.14, FortiProxy 7.0.0 through 7.0.21, FortiSwitchManager 7.2.0 through 7.2.6, FortiSwitchManager 7.0.0 through 7.0.5 allows an unauthenticated attacker to bypass the FortiCloud SSO login authentication via a crafted SAML response message.

CWE-347

How to fix

Remediation Available

fortiosNVD

Affected:>= 7.6.0, < 7.6.4Fixed in:7.6.4CVE-2025-59718derived from NVD

fortiproxyNVD

Affected:>= 7.6.0, < 7.6.4Fixed in:7.6.4CVE-2025-59718derived from NVD

fortiswitchmanagerNVD

Affected:>= 7.2.0, < 7.2.7Fixed in:7.2.7CVE-2025-59718derived 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

66.32%probability of exploitation in 30 days

99thpercentile

Very high risk: more likely to be exploited than 99% of all known CVEs.

Known Exploited Vulnerability (CISA KEV)

Remediation due: 2025-12-23

References

Vendor Advisory1

fortiguard.fortinet.com

Third-Party Advisory2

Government Resource1

cisa.gov

Related Vulnerabilities

Other CWE-347 vulnerabilities, ordered by exploit likelihood. View all

CVE	Severity	CVSS	EPSS	Exploited	Fix
CVE-2018-16042	Medium	6.5	82%	-	-
CVE-2025-25292	Critical	9.8	64%	-	Fix
CVE-2021-22160	Critical	9.8	53%	-	Fix
CVE-2013-3900	Medium	5.5	45%	KEV	-
CVE-2018-0114	High	7.5	43%	-	Fix
CVE-2020-1464	High	7.8	41%	KEV	-

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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 2026-06-09.