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CriticalKEV

CVE-2025-59718 — Fortinet Multiple Products Improper Verification of Cryptographic Signature Vulnerability

CVE-2025-59718 · FortiOS · CVSS 9.8 · KEV

In brief

Severity · CVSS
Critical9.8CVSS 3.1, Critical
EPSS
68%
CISA KEV
Known exploited, listed since 16 Dec 2025
Vendor
Fortinet
Published · Modified
·
Last verified

Summary

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.

Weakness: CWE-347

Title, description and the vendor's statements are quoted from the CVE record; a vendor's advisory is summarised in Patcharo's words, with a link.

Affected and fixed versions

Per product and release branch, as the vendor's CVE record and official advisory state them. A fixed release is shown only when a document names it: the vendor's, or CERT-FR's for Check Point, with its source.

10 branches with a published fixed release

Fortinet FortiSwitchManager

Source: FG-IR-25-647CVE-2025-59718

  1. 7.2
    Affected versions7.2.0 – 7.2.6
    First fixed release7.2.7
  2. 7.0
    Affected versions7.0.0 – 7.0.5
    First fixed release7.0.6

Releases the vendor does not list are not affected.

Fortinet FortiOS

Source: FG-IR-25-647CVE-2025-59718

  1. 7.6
    Affected versions7.6.0 – 7.6.3
    First fixed release7.6.4
  2. 7.4
    Affected versions7.4.0 – 7.4.8
    First fixed release7.4.9
  3. 7.2End of life
    Affected versions7.2.0 – 7.2.11
    First fixed release7.2.12
  4. 7.0End of life
    Affected versions7.0.0 – 7.0.17
    First fixed release7.0.18
  5. 6.4End of life
    Affected versionsNot affected
    First fixed release—

Releases the vendor does not list are not affected.

Fortinet FortiProxy

Source: FG-IR-25-647CVE-2025-59718

  1. 7.6
    Affected versions7.6.0 – 7.6.3
    First fixed release7.6.4
  2. 7.4
    Affected versions7.4.0 – 7.4.10
    First fixed release7.4.11
  3. 7.2Approaching end of support
    Affected versions7.2.0 – 7.2.14
    First fixed release7.2.15
  4. 7.0End of life
    Affected versions7.0.0 – 7.0.21
    First fixed release7.0.22

Releases the vendor does not list are not affected.

Remediation

Fix available

Vendor fix

  • FortiSwitchManager 7.27.2.7
  • FortiSwitchManager 7.07.0.6
  • FortiOS 7.67.6.4
  • FortiOS 7.47.4.9
  • FortiOS 7.27.2.12
  • FortiOS 7.07.0.18
  • FortiProxy 7.67.6.4
  • FortiProxy 7.47.4.11
  • FortiProxy 7.27.2.15
  • FortiProxy 7.07.0.22

Upgrade to a fixed release listed above for your branch, or to a later fixed release the vendor explicitly supports.

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

Full text

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

SourceFortinet (CVE record)

SourceFortiGuard FG-IR-25-647

CISA KEV required action

Apply mitigations per vendor instructions, follow applicable BOD 22-01 guidance for cloud services, or discontinue use of the product if mitigations are unavailable.

CISA due date:

SourceCISA KEV

CERT-FR recommendation

Refer to the vendor's security bulletin to obtain patches (see Documentation section).

SourceCERTFR-2025-AVI-1084

Last verified 1 Oct 2026 at 09:32 UTC

Known exploitation

Added to CISA KEV on 16 Dec 2025

Federal remediation due date: 23 Dec 2025

The CISA required action is shown under Remediation.

68% probability of exploitation in the next 30 days (percentile 99%).

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

CERT-FR

1 document of the French national CERT (ANSSI) references this CVE.

Advisory (AVI)CERTFR-2025-AVI-1084Published 10 Dec 2025

Multiple vulnerabilities in Fortinet products

Remote denial of serviceRemote cross-site scripting (XSS)Remote arbitrary code executionData integrity breachSQL injection (SQLi)Security policy bypassData confidentiality breachPrivilege escalation

Summary

Multiple vulnerabilities have been discovered in Fortinet products. Some of them allow an attacker to cause remote arbitrary code execution, privilege escalation, and remote denial of service.

Recommendation

Refer to the vendor's security bulletin to obtain patches (see Documentation section).

Official document on cert.ssi.gouv.frread by Patcharo 28 Sept 2026 at 20:04 UTCMachine translation of the French text published by CERT-FR; a text whose translation did not pass Patcharo's checks stays in French. Identifiers, versions and links are copied unchanged.

Timeline

  1. Published by the source
  2. Added to CISA KEV
  3. CISA remediation due date
  4. Source record last modified
  5. EPSS score computed
  6. Last verified by Patcharo

Official sources

References

Fortinet · CISA Known Exploited Vulnerabilities · NVD · FIRST EPSS · FortiGuard FG-IR-25-647

How Patcharo reads this

Affected and fixed releases come from the vendor's structured statements and are matched against exact versions; CVSS from NVD, exploitation from CISA KEV and the vendor's own advisory, probability from FIRST EPSS. Missing data stays Unknown and never becomes Not affected.

Read the methodologyRead the guide: FortiOS version numbering: branches, patch releases and the Feature and Mature labels

Related vulnerabilities

Other records affecting the same products, newest first.

  • CVE-2026-71407A Stack-based Buffer Overflow vulnerability [CWE-121] vulnerability in Fortinet FortiOS 7.6.1 through 7.6.6 m…High
  • CVE-2025-53844A out-of-bounds write vulnerability in Fortinet FortiOS 7.6.0 through 7.6.3, FortiOS 7.4.0 through 7.4.8, For…High
  • CVE-2025-53847A missing authentication for critical function vulnerability in Fortinet FortiOS 7.6.0 through 7.6.3, FortiOS…High
  • CVE-2025-68686Fortinet FortiOS Exposure of Sensitive Information to an Unauthorized Actor VulnerabilityMediumKEV
  • CVE-2025-64157A use of externally-controlled format string vulnerability in Fortinet FortiOS 7.6.0 through 7.6.4, FortiOS 7…High

All FortiOS vulnerabilitiesAll FortiProxy vulnerabilitiesAll Fortinet vulnerabilities