Which products and versions are affected by CVE-2025-25256?

Affected: FortiSIEM (Fortinet) versions 5.2.8, 5.3.0, 5.3.1, 5.3.2, 5.3.3, 5.4.0, 6.1.0, 6.1.1. The full list is in the CVE brief.

Is CVE-2025-25256 being exploited in the wild?

It is exploited in the wild, listed in Industry KEV feed since Aug 12, 2025.

Is CVE-2025-25256 in the CISA KEV catalog?

No, it is not currently listed in the CISA Known Exploited Vulnerabilities catalog.

Is there a public exploit for CVE-2025-25256?

Public exploit code is available.

Is there a fix for CVE-2025-25256?

Fixed versions are available, including FortiSIEM 6.7.10, FortiSIEM 7.0.4, FortiSIEM 7.1.8.

How urgently should CVE-2025-25256 be patched?

Brandefense priority: patch immediately, because it is listed as exploited in the wild.

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Vulnerability Intelligence

CVE-2025-25256

CriticalExploitedPublic exploit

An improper neutralization of special elements used in an OS command ('OS Command Injection') vulnerability [CWE-78] in Fortinet FortiSIEM version 7.3.0 through 7.3.1, 7.2.0 through 7.2.5, 7.1.0 through 7.1.7, 7.0.0 through 7.0.3 and before

Published Aug 12, 2025 · Updated Aug 18, 2026

Key Facts

Patch immediately

CVE-2025-25256 is a critical-severity vulnerability (CVSS 9.8 v3.1) affecting FortiSIEM (Fortinet).
It is exploited in the wild, listed in Industry KEV feed since Aug 12, 2025. Public exploit code is available.
EPSS estimates a 65% probability of exploitation in the next 30 days.
Fixed versions are available, including FortiSIEM 6.7.10, FortiSIEM 7.0.4, FortiSIEM 7.1.8.
Brandefense priority: patch immediately, because it is listed as exploited in the wild.

CVSS v3.1

9.8

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

EPSS (30-day exploit likelihood)

65%

Higher than 99.2% of all scored CVEs

Exploited in the wild

Yes

1 catalog listing

Public exploit code

Available

Proof-of-concept or weaponized module

Get the full CVE-2025-25256 brief as a PDF

Every affected product and fixed release, exploitation status and a first 24 hours response checklist, emailed within minutes.

Description

An improper neutralization of special elements used in an OS command ('OS Command Injection') vulnerability [CWE-78] vulnerability in Fortinet FortiSIEM 7.3.0 through 7.3.1, FortiSIEM 7.2.0 through 7.2.5, FortiSIEM 7.1.0 through 7.1.7, FortiSIEM 7.0.0 through 7.0.3, FortiSIEM 6.7.0 through 6.7.9, FortiSIEM 6.6 all versions, FortiSIEM 6.5 all versions, FortiSIEM 6.4 all versions, FortiSIEM 6.3 all versions, FortiSIEM 6.2 all versions, FortiSIEM 6.1 all versions, FortiSIEM 5.4 all versions, FortiSIEM 5.3 all versions, FortiSIEM 5.2 all versions, FortiSIEM 5.1 all versions, FortiSIEM 5.0 all versions, FortiSIEM 4.10 all versions, FortiSIEM 4.9 all versions, FortiSIEM 4.7 all versions allows an unauthenticated attacker to execute unauthorized code or commands via crafted CLI requests.

Known-Exploited Catalog Listings

Catalog	Added	Remediation due	Ransomware use
Industry KEV feed	Aug 12, 2025	n/a	Not reported

Required action: Apply remediations or mitigations per vendor instructions or discontinue use of the product if remediation or mitigations are unavailable.

Affected Products

62 affected entries in total

Product	Affected versions	Fixed in
FortiSIEMFortinet	5.2.8, 5.3.0, 5.3.1, 5.3.2, 5.3.3, 5.4.0, 6.1.0, 6.1.1	6.7.10

Patched Releases

FortiSIEM

6.7.10, 7.0.4, 7.1.8, 7.2.6, 7.3.2

Timeline

Publicly disclosed
Aug 12, 2025
Added to Industry KEV feed
Aug 12, 2025
Last updated
Aug 18, 2026

Weakness Type

CWE-78 Improper Neutralization of Special Elements used in an OS Command ('OS Command Injection')

References

advisoryhttps://fortiguard.fortinet.com/psirt/FG-IR-25-152
advisoryhttps://www.theregister.com/2025/08/13/fortinet_discloses_critical_bug/
exploitVulnCheck exploitation report
exploitVulnCheck exploitation report
exploitVulnCheck exploitation report

3 more references in the full CVE brief

FAQ

Common Questions.

An improper neutralization of special elements used in an OS command ('OS Command Injection') vulnerability [CWE-78] vulnerability in Fortinet FortiSIEM 7.3.0 through 7.3.1, FortiSIEM 7.2.0 through 7.2.5, FortiSIEM 7.1.0 through 7.1.7, FortiSIEM 7.0.0 through 7.0.3, FortiSIEM 6.7.0 through 6.7.9, FortiSIEM 6.6 all ver…
Affected: FortiSIEM (Fortinet) versions 5.2.8, 5.3.0, 5.3.1, 5.3.2, 5.3.3, 5.4.0, 6.1.0, 6.1.1. The full list is in the CVE brief.
It is exploited in the wild, listed in Industry KEV feed since Aug 12, 2025.
No, it is not currently listed in the CISA Known Exploited Vulnerabilities catalog.
Public exploit code is available.
Fixed versions are available, including FortiSIEM 6.7.10, FortiSIEM 7.0.4, FortiSIEM 7.1.8.
Brandefense priority: patch immediately, because it is listed as exploited in the wild.

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