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CVE-2025-53847 — A missing authentication for critical function vulnerability in Fortinet FortiOS 7.6.0 through 7.6.3, FortiOS…

CVE-2025-53847 · FortiOS · CVSS 8.8

In brief

Severity · CVSS
High8.8CVSS 3.1, High
EPSS
0.28%
CISA KEV
Not listed
Vendor
Fortinet
Products
FortiOS
Published · Modified
·
Last verified

Summary

A missing authentication for critical function 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, FortiOS 6.4 all versions, FortiOS 6.2.9 through 6.2.17 allows attacker to execute unauthorized code or commands via specially crafted packets.

Weakness: CWE-306

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.

4 branches with a published fixed release · 2 branches to migrate

Fortinet FortiOS

Source: FG-IR-26-125CVE-2025-53847

  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 versions6.4.0 – 6.4.16
    First fixed releaseMigration to a fixed release required
  6. 6.2End of life
    Affected versions6.2.9 – 6.2.17
    First fixed releaseMigration to a fixed release required

Releases the vendor does not list are not affected.

Remediation

Fix available

Vendor fix

  • FortiOS 7.67.6.4
  • FortiOS 7.47.4.9
  • FortiOS 7.27.2.12
  • FortiOS 7.07.0.18

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

Branches without a fix of their own: migrate to a fixed release

  • FortiOS 6.4
  • FortiOS 6.2

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

SourceFortinet (CVE record)

SourceFortiGuard FG-IR-26-125

CERT-FR recommendation

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

SourceCERTFR-2026-AVI-0440

Last verified 1 Oct 2026 at 09:29 UTC

Known exploitation

Not listed in CISA KEV as of the last check.

0.28% probability of exploitation in the next 30 days (percentile 19%).

CVSS:3.1/AV:A/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-2026-AVI-0440Published 15 Apr 2026

Multiple vulnerabilities in Fortinet products

Remote arbitrary code executionPrivilege escalationRemote denial of serviceData confidentiality breachData integrity breachSecurity policy bypassRemote cross-site scripting (XSS)Not specified by the vendorServer-side request forgery (SSRF)SQL injection (SQLi)

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. Fortinet indicates that the CVE-2025-61624 vulnerability is actively exploited.

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 20:03 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. EPSS score computed
  3. Source record last modified
  4. Last verified by Patcharo

Official sources

References

Fortinet · NVD · FIRST EPSS · FortiGuard FG-IR-26-125

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-2025-68686Fortinet 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
  • CVE-2026-22153An Authentication Bypass by Primary Weakness vulnerability [CWE-305] vulnerability in Fortinet FortiOS 7.6.0 …High

All FortiOS vulnerabilitiesAll Fortinet vulnerabilities