CVE-2025-59718

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Summary

CVECVE-2025-59718
StatePUBLISHED
Assignerfortinet
Source PriorityCVE Program / NVD first with legacy fallback
Published2025-12-09 18:15:54 UTC
Updated2026-06-09 12:47:10 UTC
DescriptionA 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.

Risk And Classification

Primary CVSS: v3.1 9.8 CRITICAL from [email protected]

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

EPSS: 0.658250000 probability, percentile 0.991690000 (date 2026-06-23)

CISA KEV: Listed on 2025-12-16; due 2025-12-23; ransomware use Unknown

Problem Types: CWE-347 | CWE-347 Improper access control

VersionSourceTypeScoreSeverityVector
3.1[email protected]Secondary9.8CRITICALCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
3.1CNACVSS9.1CRITICALCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H/E:F/RL:O/RC:C

CVSS v3.1 Breakdown

Attack Vector
Network
Attack Complexity
Low
Privileges Required
None
User Interaction
None
Scope
Unchanged
Confidentiality
High
Integrity
High
Availability
High

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

CISA Known Exploited Vulnerability

VendorFortinet
ProductMultiple Products
NameFortinet Multiple Products Improper Verification of Cryptographic Signature Vulnerability
Required ActionApply mitigations per vendor instructions, follow applicable BOD 22-01 guidance for cloud services, or discontinue use of the product if mitigations are unavailable.
Noteshttps://fortiguard.fortinet.com/psirt/FG-IR-25-647 ; https://docs.fortinet.com/upgrade-tool/fortigate ; https://nvd.nist.gov/vuln/detail/CVE-2025-59718

NVD Known Affected Configurations (CPE 2.3)

TypeVendorProductVersionUpdateEditionLanguage
Application Fortinet Fortiproxy All All All All

Vendor Declared Affected Products

SourceVendorProductVersionPlatforms
CNA Fortinet FortiSwitchManager affected 7.2.0 7.2.6 semver Not specified
CNA Fortinet FortiSwitchManager affected 7.0.0 7.0.5 semver Not specified
CNA Fortinet FortiOS affected 7.6.0 7.6.3 semver Not specified
CNA Fortinet FortiOS affected 7.4.0 7.4.8 semver Not specified
CNA Fortinet FortiOS affected 7.2.0 7.2.11 semver Not specified
CNA Fortinet FortiOS affected 7.0.0 7.0.17 semver Not specified
CNA Fortinet FortiProxy affected 7.6.0 7.6.3 semver Not specified
CNA Fortinet FortiProxy affected 7.4.0 7.4.10 semver Not specified
CNA Fortinet FortiProxy affected 7.2.0 7.2.14 semver Not specified
CNA Fortinet FortiProxy affected 7.0.0 7.0.21 semver Not specified
ADP Siemens RUGGEDCOM APE1808 affected * custom Not specified

References

ReferenceSourceLinkTags
cert-portal.siemens.com/productcert/html/ssa-864900.html 0b142b55-0307-4c5a-b3c9-f314f3fb7c5e cert-portal.siemens.com Third Party Advisory
www.cisa.gov/known-exploited-vulnerabilities-catalog 134c704f-9b21-4f2e-91b3-4a467353bcc0 www.cisa.gov US Government Resource
fortiguard.fortinet.com/psirt/FG-IR-25-647 [email protected] fortiguard.fortinet.com Vendor Advisory
arcticwolf.com/resources/blog/arctic-wolf-observes-malicious-sso-logins-foll... 134c704f-9b21-4f2e-91b3-4a467353bcc0 arcticwolf.com Third Party Advisory
CVE Program record CVE.ORG www.cve.org canonical
NVD vulnerability detail NVD nvd.nist.gov canonical, analysis
CISA Known Exploited Vulnerabilities catalog CISA www.cisa.gov kev

Additional Advisory Data

SourceTimeEvent
ADP2025-12-16T00:00:00.000ZCVE-2025-59718 added to CISA KEV

Solutions

CNA: Upgrade to FortiSwitchManager version 7.2.7 or above Upgrade to FortiSwitchManager version 7.0.6 or above Upgrade to FortiProxy version 7.6.4 or above Upgrade to FortiProxy version 7.4.11 or above Upgrade to FortiProxy version 7.2.15 or above Upgrade to FortiProxy version 7.0.22 or above Upgrade to FortiOS version 7.6.4 or above Upgrade to FortiOS version 7.4.9 or above Upgrade to FortiOS version 7.2.12 or above Upgrade to FortiOS version 7.0.18 or above Upgrade to FortiWeb version 8.0.1 or above Upgrade to FortiWeb version 7.6.5 or above Upgrade to FortiWeb version 7.4.10 or above Fortinet remediated this issue in FortiSASE version 25.3.b and hence customers do not need to perform any action. Upgrade to FortiPAM version 1.8.0 or above

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