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Critical

CVE-2023-42789 — A out-of-bounds write vulnerability in Fortinet FortiOS 7.4.0 through 7.4.1, FortiOS 7.2.0 through 7.2.5, For…

CVE-2023-42789 · FortiProxy · CVSS 9.8

In brief

Severity · CVSS
Critical9.8CVSS 3.1, Critical
EPSS
3%
CISA KEV
Not listed
CERT-FR
No advisory or alert referenced in the catalog
Vendor
Fortinet
Published · Modified
·
Last verified

Summary

A out-of-bounds write vulnerability in Fortinet FortiOS 7.4.0 through 7.4.1, FortiOS 7.2.0 through 7.2.5, FortiOS 7.0.0 through 7.0.12, FortiOS 6.4.0 through 6.4.14, FortiOS 6.2.0 through 6.2.15, FortiProxy 7.4.0, FortiProxy 7.2.0 through 7.2.6, FortiProxy 7.0.0 through 7.0.12, FortiProxy 2.0.0 through 2.0.13, FortiSASE 23.2.b allows attacker to execute unauthorized code or commands via specially crafted HTTP requests.

Weakness: CWE-787

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.

9 branches with a published fixed release · 1 branch to migrate

Fortinet FortiProxy

Source: FG-IR-23-328CVE-2023-42789

  1. 7.4
    Affected versions7.4.0
    First fixed release7.4.1
  2. 7.2Approaching end of support
    Affected versions7.2.0 – 7.2.6
    First fixed release7.2.7
  3. 7.0End of life
    Affected versions7.0.0 – 7.0.12
    First fixed release7.0.13
  4. 2.0End of life
    Affected versions2.0.0 – 2.0.13
    First fixed release2.0.14
  5. 1.2End of life
    Affected versionsNot affected
    First fixed release—

Releases the vendor does not list are not affected.

Fortinet FortiSASE

Source: FG-IR-23-328CVE-2023-42789

  1. 24.1
    Affected versionsNot affected
    First fixed release—
  2. 23.4
    Affected versionsNot affected
    First fixed release—
  3. 23.3
    Affected versionsNot affected
    First fixed release—
  4. 23.2
    Affected versionsListed as affected, releases not specified
    First fixed releaseMigration to a fixed release required
  5. 23.1
    Affected versionsNot affected
    First fixed release—
  6. 22.4
    Affected versionsNot affected
    First fixed release—

Releases the vendor does not list are not affected.

Fortinet FortiOS

Source: FG-IR-23-328CVE-2023-42789

  1. 7.4
    Affected versions7.4.0 – 7.4.1
    First fixed release7.4.2
  2. 7.2End of life
    Affected versions7.2.0 – 7.2.5
    First fixed release7.2.6
  3. 7.0End of life
    Affected versions7.0.0 – 7.0.12
    First fixed release7.0.13
  4. 6.4End of life
    Affected versions6.4.0 – 6.4.14
    First fixed release6.4.15
  5. 6.2End of life
    Affected versions6.2.0 – 6.2.15
    First fixed release6.2.16

Releases the vendor does not list are not affected.

Remediation

Fix available

Vendor fix

  • FortiProxy 7.47.4.1
  • FortiProxy 7.27.2.7
  • FortiProxy 7.07.0.13
  • FortiProxy 2.02.0.14
  • FortiOS 7.47.4.2
  • FortiOS 7.27.2.6
  • FortiOS 7.07.0.13
  • FortiOS 6.46.4.15
  • FortiOS 6.26.2.16

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

  • FortiSASE 23.2

Upgrade to FortiProxy version 7.4.1 or above Upgrade to FortiProxy version 7.2.7 or above Upgrade to FortiProxy version 7.0.13 or above Upgrade to FortiProxy version 2.0.14 or above Upgrade to FortiSwitchManager version 7.2.3 or above Upgrade to FortiSwitchManager version 7.0.3 or above Fortinet remediated this issue

Full text

in FortiSASE version 23.3.b and hence customers do not need to perform any action. Upgrade to FortiOS version 7.4.2 or above Upgrade to FortiOS version 7.2.6 or above Upgrade to FortiOS version 7.0.13 or above Upgrade to FortiOS version 6.4.15 or above Upgrade to FortiOS version 6.2.16 or above Upgrade to FortiPAM version 1.2.0 or above

SourceFortinet (CVE record)

SourceFortiGuard FG-IR-23-328

Last verified 1 Oct 2026 at 09:29 UTC

Known exploitation

Not listed in CISA KEV as of the last check.

3% probability of exploitation in the next 30 days (percentile 88%).

CVSS:3.1/AV:N/AC:L/PR:N/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-23-328

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 FortiProxy vulnerabilitiesAll FortiOS vulnerabilitiesAll Fortinet vulnerabilities