PT-2025-47356 · Fortinet · Fortios

Published 2025-11-18 · Updated 2026-01-16 · CVE-2025-53843

Positive Technologies (AI Summary)

CVSS v3.1

7.5

High

Base vector

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

Name of the Vulnerable Software and Affected Versions Fortinet FortiOS versions 6.4 through 7.6.3 Fortinet FortiOS version 7.0 Fortinet FortiOS version 7.2 Fortinet FortiOS versions 7.4.0 through 7.4.8 Fortinet FortiOS versions 7.6.0 through 7.6.3

Description A stack-based buffer overflow exists in Fortinet FortiOS. An unauthenticated attacker can remotely execute code. The issue is triggered by specially crafted packets.

Recommendations Fortinet FortiOS version 6.4: At the moment, there is no information about a newer version that contains a fix for this vulnerability. Fortinet FortiOS version 7.0: At the moment, there is no information about a newer version that contains a fix for this vulnerability. Fortinet FortiOS version 7.2: At the moment, there is no information about a newer version that contains a fix for this vulnerability. Fortinet FortiOS versions 7.4.0 through 7.4.8: At the moment, there is no information about a newer version that contains a fix for this vulnerability. Fortinet FortiOS versions 7.6.0 through 7.6.3: At the moment, there is no information about a newer version that contains a fix for this vulnerability.

Stack Overflow

Weakness Enumeration

CWE-121

Related Identifiers

BDU:2025-14860

CVE-2025-53843

Affected Products

Fortios

References · 8

• https://fortiguard.fortinet.com/psirt/FG-IR-25-358 · Vendor Advisory
• https://nvd.nist.gov/vuln/detail/CVE-2025-53843 · Security Note
• https://osv.dev/vulnerability/CVE-2025-53843 · Vendor Advisory
• https://bdu.fstec.ru/vul/2025-14860 · Security Note
• https://twitter.com/VulmonFeeds/status/1990892409618563227 · Twitter Post
• https://twitter.com/ZeroPathLabs/status/1990835033473515978 · Twitter Post
• https://twitter.com/CVEnew/status/1991042958494187928 · Twitter Post
• https://t.me/CVEtracker/37635 · Telegram Post