CVE-2025-53844 - Vulnerability Details

- Out-of-Bounds Write in FortiOS Allows Remote Code Execution

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.

Published: 2026-05-12

Score: 8.3 High

EPSS: < 1% Very Low

KEV: No

Impact:

Action:

Analysis

Analysis and contextual insights are available on OpenCVE Cloud.

Default status is the baseline for the product, each version can override it (e.g. patched versions marked unaffected).

Vendor Product Default status Versions

Fortinet

FortiOS

unaffected

Version	Status	Constraints
`7.6.0`	affected	≤ 7.6.3
`7.4.0`	affected	≤ 7.4.8
`7.2.0`	affected	≤ 7.2.11
`7.0.0`	affected	≤ 7.0.17
`6.4.0`	affected	≤ 6.4.16
`6.2.0`	affected	≤ 6.2.17
`6.0.0`	affected	≤ 6.0.18

Configuration 1 [-]

OR	cpe:2.3:o:fortinet:fortios::::::::
	cpe:2.3:o:fortinet:fortios::::::::
	cpe:2.3:o:fortinet:fortios::::::::

No data.

Vendor Product Confidence Versions

Fortinet

Fortios

100%

Version	Status	Scheme	Platform
`[7.6.0,7.6.3]`	affected	semver	—
`[7.4.0,7.4.8]`	affected	semver	—
`[7.2.0,7.2.11]`	affected	semver	—
`[7.0.0,7.0.17]`	affected	semver	—
`[6.4.0,6.4.16]`	affected	semver	—
`[6.2.0,6.2.17]`	affected	semver	—
`[6.0.0,6.0.18]`	affected	semver	—

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Remediation

Vendor Solution

Upgrade to FortiOS version 7.6.4 or above Upgrade to FortiOS version 7.4.9 or above Upgrade to FortiOS version 7.2.12 or above Upgrade to FortiOS version 7.0.18 or above Fortinet remediated this issue in FortiSASE version 25.3.a and hence customers do not need to perform any action. Upgrade to FortiSwitchManager version 7.2.7 or above Upgrade to FortiSwitchManager version 7.0.6 or above Fortinet remediated this issue in FortiEdgeCloud version 25.3 and hence customers do not need to perform any action.

Tracking

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Advisories

No advisories yet.

No CVSS v4.0

Attack Vector Network

Attack Complexity Low

Privileges Required Low

Scope Unchanged

Confidentiality Impact High

Integrity Impact High

Availability Impact High

User Interaction None

No CVSS v3.0

No CVSS v2

This CVE is not in the KEV list.

The EPSS score is 0.00023.

Exploitation none

Automatable no

Technical Impact total

References

Link	Providers
https://fortiguard.fortinet.com/psirt/FG-IR-26-123

History

Fri, 15 May 2026 14:15:00 +0000

Type	Values Removed	Values Added
CPEs		cpe:2.3:o:fortinet:fortios::::::::

Tue, 12 May 2026 19:15:00 +0000

Type	Values Removed	Values Added
Metrics		ssvc `{'options': {'Automatable': 'no', 'Exploitation': 'none', 'Technical Impact': 'total'}, 'version': '2.0.3'}`

Tue, 12 May 2026 18:45:00 +0000

Type	Values Removed	Values Added
Title		Out-of-Bounds Write in FortiOS Allows Remote Code Execution

Tue, 12 May 2026 17:30:00 +0000

Type	Values Removed	Values Added
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.
First Time appeared		Fortinet Fortinet fortios
Weaknesses		CWE-787
CPEs		cpe:2.3:o:fortinet:fortios:6.0.0:::::::* cpe:2.3:o:fortinet:fortios:6.0.10:::::::* cpe:2.3:o:fortinet:fortios:6.0.11:::::::* cpe:2.3:o:fortinet:fortios:6.0.12:::::::* cpe:2.3:o:fortinet:fortios:6.0.13:::::::* cpe:2.3:o:fortinet:fortios:6.0.14:::::::* cpe:2.3:o:fortinet:fortios:6.0.15:::::::* cpe:2.3:o:fortinet:fortios:6.0.16:::::::* cpe:2.3:o:fortinet:fortios:6.0.17:::::::* cpe:2.3:o:fortinet:fortios:6.0.18:::::::* cpe:2.3:o:fortinet:fortios:6.0.1:::::::* cpe:2.3:o:fortinet:fortios:6.0.2:::::::* cpe:2.3:o:fortinet:fortios:6.0.3:::::::* cpe:2.3:o:fortinet:fortios:6.0.4:::::::* cpe:2.3:o:fortinet:fortios:6.0.5:::::::* cpe:2.3:o:fortinet:fortios:6.0.6:::::::* cpe:2.3:o:fortinet:fortios:6.0.7:::::::* cpe:2.3:o:fortinet:fortios:6.0.8:::::::* cpe:2.3:o:fortinet:fortios:6.0.9:::::::* cpe:2.3:o:fortinet:fortios:6.2.0:::::::* cpe:2.3:o:fortinet:fortios:6.2.10:::::::* cpe:2.3:o:fortinet:fortios:6.2.11:::::::* cpe:2.3:o:fortinet:fortios:6.2.12:::::::* cpe:2.3:o:fortinet:fortios:6.2.13:::::::* cpe:2.3:o:fortinet:fortios:6.2.14:::::::* cpe:2.3:o:fortinet:fortios:6.2.15:::::::* cpe:2.3:o:fortinet:fortios:6.2.16:::::::* cpe:2.3:o:fortinet:fortios:6.2.17:::::::* cpe:2.3:o:fortinet:fortios:6.2.1:::::::* cpe:2.3:o:fortinet:fortios:6.2.2:::::::* cpe:2.3:o:fortinet:fortios:6.2.3:::::::* cpe:2.3:o:fortinet:fortios:6.2.4:::::::* cpe:2.3:o:fortinet:fortios:6.2.5:::::::* cpe:2.3:o:fortinet:fortios:6.2.6:::::::* cpe:2.3:o:fortinet:fortios:6.2.7:::::::* cpe:2.3:o:fortinet:fortios:6.2.8:::::::* cpe:2.3:o:fortinet:fortios:6.2.9:::::::* cpe:2.3:o:fortinet:fortios:6.4.0:::::::* cpe:2.3:o:fortinet:fortios:6.4.10:::::::* cpe:2.3:o:fortinet:fortios:6.4.11:::::::* cpe:2.3:o:fortinet:fortios:6.4.12:::::::* cpe:2.3:o:fortinet:fortios:6.4.13:::::::* cpe:2.3:o:fortinet:fortios:6.4.14:::::::* cpe:2.3:o:fortinet:fortios:6.4.15:::::::* cpe:2.3:o:fortinet:fortios:6.4.16:::::::* cpe:2.3:o:fortinet:fortios:6.4.1:::::::* cpe:2.3:o:fortinet:fortios:6.4.2:::::::* cpe:2.3:o:fortinet:fortios:6.4.3:::::::* cpe:2.3:o:fortinet:fortios:6.4.4:::::::* cpe:2.3:o:fortinet:fortios:6.4.5:::::::* cpe:2.3:o:fortinet:fortios:6.4.6:::::::* cpe:2.3:o:fortinet:fortios:6.4.7:::::::* cpe:2.3:o:fortinet:fortios:6.4.8:::::::* cpe:2.3:o:fortinet:fortios:6.4.9:::::::* cpe:2.3:o:fortinet:fortios:7.0.0:::::::* cpe:2.3:o:fortinet:fortios:7.0.10:::::::* cpe:2.3:o:fortinet:fortios:7.0.11:::::::* cpe:2.3:o:fortinet:fortios:7.0.12:::::::* cpe:2.3:o:fortinet:fortios:7.0.13:::::::* cpe:2.3:o:fortinet:fortios:7.0.14:::::::* cpe:2.3:o:fortinet:fortios:7.0.15:::::::* cpe:2.3:o:fortinet:fortios:7.0.16:::::::* cpe:2.3:o:fortinet:fortios:7.0.17:::::::* cpe:2.3:o:fortinet:fortios:7.0.1:::::::* cpe:2.3:o:fortinet:fortios:7.0.2:::::::* cpe:2.3:o:fortinet:fortios:7.0.3:::::::* cpe:2.3:o:fortinet:fortios:7.0.4:::::::* cpe:2.3:o:fortinet:fortios:7.0.5:::::::* cpe:2.3:o:fortinet:fortios:7.0.6:::::::* cpe:2.3:o:fortinet:fortios:7.0.7:::::::* cpe:2.3:o:fortinet:fortios:7.0.8:::::::* cpe:2.3:o:fortinet:fortios:7.0.9:::::::* cpe:2.3:o:fortinet:fortios:7.2.0:::::::* cpe:2.3:o:fortinet:fortios:7.2.10:::::::* cpe:2.3:o:fortinet:fortios:7.2.11:::::::* cpe:2.3:o:fortinet:fortios:7.2.1:::::::* cpe:2.3:o:fortinet:fortios:7.2.2:::::::* cpe:2.3:o:fortinet:fortios:7.2.3:::::::* cpe:2.3:o:fortinet:fortios:7.2.4:::::::* cpe:2.3:o:fortinet:fortios:7.2.5:::::::* cpe:2.3:o:fortinet:fortios:7.2.6:::::::* cpe:2.3:o:fortinet:fortios:7.2.7:::::::* cpe:2.3:o:fortinet:fortios:7.2.8:::::::* cpe:2.3:o:fortinet:fortios:7.2.9:::::::* cpe:2.3:o:fortinet:fortios:7.4.0:::::::* cpe:2.3:o:fortinet:fortios:7.4.1:::::::* cpe:2.3:o:fortinet:fortios:7.4.2:::::::* cpe:2.3:o:fortinet:fortios:7.4.3:::::::* cpe:2.3:o:fortinet:fortios:7.4.4:::::::* cpe:2.3:o:fortinet:fortios:7.4.5:::::::* cpe:2.3:o:fortinet:fortios:7.4.6:::::::* cpe:2.3:o:fortinet:fortios:7.4.7:::::::* cpe:2.3:o:fortinet:fortios:7.4.8:::::::* cpe:2.3:o:fortinet:fortios:7.6.0:::::::* cpe:2.3:o:fortinet:fortios:7.6.1:::::::* cpe:2.3:o:fortinet:fortios:7.6.2:::::::* cpe:2.3:o:fortinet:fortios:7.6.3:::::::*
Vendors & Products		Fortinet Fortinet fortios
References		https://fortiguard.fortinet.com/psirt/FG-IR-26-123
Metrics		cvssV3_1 `{'score': 8.3, 'vector': 'CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H/E:P/RL:O/RC:C'}`

Subscriptions

Fortinet Fortios

MITRE

Status: PUBLISHED

Assigner: fortinet

Published: 2026-05-12T16:54:10.126Z

Updated: 2026-05-13T03:58:28.011Z

Reserved: 2025-07-10T08:53:33.015Z

Link: CVE-2025-53844

Vulnrichment

Updated: 2026-05-12T19:02:24.868Z

NVD

Status : Analyzed

Published: 2026-05-12T18:16:35.983

Modified: 2026-05-15T14:04:00.013

Link: CVE-2025-53844

Redhat

No data.

OpenCVE Enrichment

Updated: 2026-05-12T21:45:05Z

Weaknesses

CWE-787

Tracking

Attack Vector Network

Attack Complexity Low

Privileges Required Low

Scope Unchanged

Confidentiality Impact High

Integrity Impact High

Availability Impact High

User Interaction None

Exploitation none

Automatable no

Technical Impact total

Subscriptions

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