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CVE-2023-44247 — A double free vulnerability [CWE-415] vulnerability in Fortinet FortiOS 6.4 all versions may allow a privileg…

CVE-2023-44247 · FortiOS · CVSS 7.2

In brief

Severity · CVSS
High7.2CVSS 3.1, High
EPSS
1%
CISA KEV
Not listed
CERT-FR
No advisory or alert referenced in the catalog
Vendor
Fortinet
Products
FortiOS
Published · Modified
·
Last verified

Summary

A double free vulnerability [CWE-415] vulnerability in Fortinet FortiOS 6.4 all versions may allow a privileged attacker to execute code or commands via crafted HTTP or HTTPs requests.

Weakness: CWE-415

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.

1 branch to migrate

No precise fixed release is published in the sources Patcharo follows.

Fortinet FortiOS

Source: FG-IR-23-195CVE-2023-44247

  1. 7.4
    Affected versionsNot affected
    First fixed release—
  2. 7.2End of life
    Affected versionsNot affected
    First fixed release—
  3. 7.0End of life
    Affected versionsNot affected
    First fixed release—
  4. 6.4End of life
    Affected versions6.4.0 – 6.4.16
    First fixed releaseMigration to a fixed release required

Releases the vendor does not list are not affected.

Remediation

Vendor guidance

Vendor statement

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

  • FortiOS 6.4

Upgrade to FortiOS version 7.0.0 or above

SourceFortinet (CVE record)

Vendor advisory

Sourcehttps://fortiguard.com/psirt/FG-IR-23-195

Last verified 1 Oct 2026 at 09:29 UTC

Known exploitation

Not listed in CISA KEV as of the last check.

1% probability of exploitation in the next 30 days (percentile 68%).

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

CERT-FR

No CERT-FR advisory or alert of the last two years references this CVE, for the vendors Patcharo covers.

Timeline

  1. Published by the source
  2. Source record last modified
  3. EPSS score computed
  4. Last verified by Patcharo

Official sources

References

Fortinet · NVD · FIRST EPSS · FortiGuard FG-IR-23-195

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 Fortinet vulnerabilities