CVE-2025-53844

Severity: high (CVSS 8.8 v3.1)
Exploited in the wild: not listed in CISA KEV
EPSS: 0.6% probability of exploitation in the next 30 days
Public exploit or detection template: none known
Published: 2026-05-12 · updated 2026-10-07
Weakness: CWE-787

Description

A out-of-bounds write 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 allows attacker to execute unauthorized code or commands via specially crafted packets.

Affected products

Fortinet FortiOS (FortiGate): from 7.2.0 before 7.2.12; from 7.4.0 before 7.4.9; from 7.6.0 before 7.6.4 — fixed in 7.2.12, 7.4.9, 7.6.4

How to fix

Upgrade to a fixed version: Fortinet FortiOS (FortiGate) 7.2.12, 7.4.9, 7.6.4. Check the vendor advisory for mitigations.

References

https://fortiguard.fortinet.com/psirt/FG-IR-26-123
https://cert-portal.siemens.com/productcert/html/ssa-864900.html

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