CVEs / CVE-2025-25256
CVE-2025-25256: Fortinet FortiSIEM vulnerability
- critical 9.8 CVSS 3.1 (from the CNA)
- EPSS 67.3% chance of exploitation in the next 30 days, higher than 99% of CVEs (14 Nov 2026)
- Last changed at its sources
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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.
Affected and fixed versions
| Product | Affected | Fixed in |
|---|---|---|
| Fortinet FortiSIEM | from 7.3.0, up to and including 7.3.1 | — |
| Fortinet FortiSIEM | from 7.2.0, up to and including 7.2.5 | — |
| Fortinet FortiSIEM | from 7.1.0, up to and including 7.1.7 | — |
| Fortinet FortiSIEM | from 7.0.0, up to and including 7.0.3 | — |
| Fortinet FortiSIEM | from 6.7.0, up to and including 6.7.9 | — |
| Fortinet FortiSIEM | from 6.6.0, up to and including 6.6.5 | — |
| Fortinet FortiSIEM | from 6.5.0, up to and including 6.5.3 | — |
| Fortinet FortiSIEM | from 6.4.0, up to and including 6.4.4 | — |
| Fortinet FortiSIEM | from 6.3.0, up to and including 6.3.3 | — |
| Fortinet FortiSIEM | from 6.2.0, up to and including 6.2.1 | — |
| Fortinet FortiSIEM | from 6.1.0, up to and including 6.1.2 | — |
| Fortinet FortiSIEM | 5.4.0 | — |
| Fortinet FortiSIEM | from 5.3.0, up to and including 5.3.3 | — |
| Fortinet FortiSIEM | from 5.2.5, up to and including 5.2.8 | — |
| Fortinet FortiSIEM | from 5.2.1, up to and including 5.2.2 | — |
| Fortinet FortiSIEM | from 5.1.0, up to and including 5.1.3 | — |
| Fortinet FortiSIEM | from 5.0.0, up to and including 5.0.1 | — |
| Fortinet FortiSIEM | 4.10.0 | — |
| Fortinet FortiSIEM | 4.9.0 | — |
| Fortinet FortiSIEM | 4.7.2 | — |
Exploitation
Not in the CISA Known Exploited Vulnerabilities catalog as of 13 Nov 2026.
Severity
| CVSS 3.1 | 9.8 criticalCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:HScored by the CNA ([email protected]) |
|---|---|
| Weakness | CWE-78 |
References
- CVE-2025-25256 on NVD
- https://fortiguard.fortinet.com/psirt/FG-IR-25-152 Vendor Advisory
- https://www.theregister.com/2025/08/13/fortinet_discloses_critical_bug/ Third Party Advisory
- https://github.com/watchtowrlabs/watchTowr-vs-FortiSIEM-CVE-2025-25256
- https://labs.watchtowr.com/should-security-solutions-be-secure-maybe-were-all-wrong-fortinet-fortisiem-pre-auth-command-injection-cve-2025-25256/
Sources
Exploitation status from the CISA Known Exploited Vulnerabilities catalog. EPSS scores from FIRST. Descriptions, severity and references from the National Vulnerability Database. Open-source package versions from OSV (CC-BY 4.0). Text is shown as each source states it; Stackurity does not edit it. Check the vendor's advisory before acting.
This product uses data from the NVD API but is not endorsed or certified by the NVD.