CVE-2025-59718

CRITICALCISA KEV

9.8

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.

CVE Details

CVSS v3.1 Score9.8

SeverityCRITICAL

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

Attack VectorNETWORK

ComplexityLOW

Privileges RequiredNONE

User InteractionNONE

Published12/9/2025

Last Modified12/17/2025

Sourcekev

Honeypot Sightings0

CISA KEV

VendorFortinet

ProductMultiple Products

Vulnerability NameFortinet Multiple Products Improper Verification of Cryptographic Signature Vulnerability

KEV Date Added2025-12-16

Remediation Due Date2025-12-23

Ransomware UseUnknown

Affected Products

fortinet:fortiosfortinet:fortiproxyfortinet:fortiswitchmanager

Weaknesses (CWE)

CWE-347

References

https://fortiguard.fortinet.com/psirt/FG-IR-25-647(psirt@fortinet.com)

https://arcticwolf.com/resources/blog/arctic-wolf-observes-malicious-sso-logins-following-disclosure-cve-2025-59718-cve-2025-59719/(134c704f-9b21-4f2e-91b3-4a467353bcc0)

https://www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2025-59718(134c704f-9b21-4f2e-91b3-4a467353bcc0)

IOC Correlations

No correlations recorded

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