CVE-2025-53843

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

Scoring

Severity

MEDIUM

CVSS base score

6.9

CVSS vector

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

EPSS probability

0.58%

CWE

CWE-121

Published

2025-11-18

Last modified

2026-08-11

Affected products

• Fortinet FortiOS
• Fortinet FortiOS
• Fortinet FortiOS
• Fortinet FortiOS
• Fortinet FortiOS

Weakness type

• CWE-121

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