# CVE-2025-53843

## Summary

- **CVE ID:** CVE-2025-53843
- **Severity:** MEDIUM
- **CVSS Score:** 6.9 (CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H/E:P/RL:W/RC:C)
- **CWE:** CWE-121
- **Published:** Nov 18, 2025
- **Last Modified:** Aug 11, 2026

## Description

A stack-based buffer overflow vulnerability in Fortinet FortiOS 7.6.0 through 7.6.3, FortiOS 7.4.0 through 7.4.8, FortiOS 7.2 all versions, FortiOS 7.0 all versions, FortiOS 6.4 all versions allows attacker to execute unauthorized code or commands via specially crafted packets

## Affected Products

- Fortinet — FortiOS (7.6.0)
- Fortinet — FortiOS (7.4.0)
- Fortinet — FortiOS (7.2.0)
- Fortinet — FortiOS (7.0.0)
- Fortinet — FortiOS (6.4.0)

## References

- [CNA](https://fortiguard.fortinet.com/psirt/FG-IR-25-358)
- [siemens-SADP](https://cert-portal.siemens.com/productcert/html/ssa-864900.html)

## Exploitation Prediction (EPSS)

- **EPSS Score:** 0.58%
- **EPSS Percentile:** 46.4

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_Exported from OnDuty AI Vulnerability Intelligence on 2026-09-17._