CVE-2025-53379

Out‑of‑Bounds Read Enabling Remote Data Exposure in FortiAuthenticator

Published Jul 14, 2026 CVSS 3.1 · 7 High EPSS < 1% KEV · Not listed

Description

A out-of-bounds read vulnerability in Fortinet FortiAuthenticator 6.6.0 through 6.6.2, FortiAuthenticator 6.5 all versions may allow a remote unauthenticated attacker to retrieve sensitive information via a specially crafted request.

Affected Products

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

FortiAuthenticator

unaffected

Version	Status	Constraints
`6.6.0`	affected	≤ 6.6.2
`6.5.0`	affected	≤ 6.5.7
`6.4.0`	affected	≤ 6.4.11
`6.3.0`	affected	≤ 6.3.5

Configuration 1 [-]

OR	cpe:2.3:a:fortinet:fortiauthenticator::::::::
	cpe:2.3:a:fortinet:fortiauthenticator::::::::

No data.

Vendor Product Versions

Fortinet

Fortiauthenticator

Version	Status	Scheme	Platform
`[6.6.0,6.6.2]`	affected	semver	—
`[6.5.0,6.5.7]`	affected	semver	—
`[6.4.0,6.4.11]`	affected	semver	—
`[6.3.0,6.3.5]`	affected	semver	—

Remediation

Vendor Solution

Upgrade to FortiAuthenticator version 6.6.3 or above

Tracking

Advisories

No advisories available

Metrics

No CVSS v4.0

Attack Vector Network

Attack Complexity Low

Privileges Required None

Scope Unchanged

Confidentiality Impact High

Integrity Impact None

Availability Impact None

User Interaction None

No CVSS v3.0

No CVSS v2

This CVE is not in the KEV list.

Exploit prediction score: < 1% (0.529% probability within 30 days)

Exploitation none

Automatable yes

Technical Impact partial

References

Link	Providers
https://fortiguard.fortinet.com/psirt/FG-IR-26-146

History

Jul 31, 2026 10:30 AM Title updated View changes

Type	Values Removed	Values Added
Title		Out‑of‑Bounds Read Enabling Remote Data Exposure in FortiAuthenticator

Jul 29, 2026 6:15 AM Title updated View changes

Type	Values Removed	Values Added
Title	Out-of-Bounds Read in FortiAuthenticator Allows Sensitive Data Disclosure

Jul 23, 2026 3:00 AM Title updated View changes

Type	Values Removed	Values Added
Title		Out-of-Bounds Read in FortiAuthenticator Allows Sensitive Data Disclosure

Jul 17, 2026 10:15 PM Title updated View changes

Type	Values Removed	Values Added
Title	Out‑of‑Bounds Read Leads to Remote Data Exposure in FortiAuthenticator

Jul 16, 2026 3:30 PM Title updated View changes

Type	Values Removed	Values Added
Title		Out‑of‑Bounds Read Leads to Remote Data Exposure in FortiAuthenticator

Jul 14, 2026 4:30 PM Scoring metrics updated View changes

Type	Values Removed	Values Added
Metrics		ssvc `{'options': {'Automatable': 'yes', 'Exploitation': 'none', 'Technical Impact': 'partial'}, 'version': '2.0.3'}`

Jul 14, 2026 3:45 PM Description updated. First appearance in the feed. Weaknesses updated. Affected versions updated. Affected vendors updated. Added references. Scoring metrics updated View changes

Type	Values Removed	Values Added
Description		A out-of-bounds read vulnerability in Fortinet FortiAuthenticator 6.6.0 through 6.6.2, FortiAuthenticator 6.5 all versions may allow a remote unauthenticated attacker to retrieve sensitive information via a specially crafted request.
First Time appeared		Fortinet Fortinet fortiauthenticator
Weaknesses		CWE-125
CPEs		cpe:2.3:a:fortinet:fortiauthenticator:6.3.0:::::::* cpe:2.3:a:fortinet:fortiauthenticator:6.3.1:::::::* cpe:2.3:a:fortinet:fortiauthenticator:6.3.2:::::::* cpe:2.3:a:fortinet:fortiauthenticator:6.3.3:::::::* cpe:2.3:a:fortinet:fortiauthenticator:6.3.4:::::::* cpe:2.3:a:fortinet:fortiauthenticator:6.3.5:::::::* cpe:2.3:a:fortinet:fortiauthenticator:6.4.0:::::::* cpe:2.3:a:fortinet:fortiauthenticator:6.4.10:::::::* cpe:2.3:a:fortinet:fortiauthenticator:6.4.11:::::::* cpe:2.3:a:fortinet:fortiauthenticator:6.4.1:::::::* cpe:2.3:a:fortinet:fortiauthenticator:6.4.2:::::::* cpe:2.3:a:fortinet:fortiauthenticator:6.4.3:::::::* cpe:2.3:a:fortinet:fortiauthenticator:6.4.4:::::::* cpe:2.3:a:fortinet:fortiauthenticator:6.4.5:::::::* cpe:2.3:a:fortinet:fortiauthenticator:6.4.6:::::::* cpe:2.3:a:fortinet:fortiauthenticator:6.4.7:::::::* cpe:2.3:a:fortinet:fortiauthenticator:6.4.8:::::::* cpe:2.3:a:fortinet:fortiauthenticator:6.4.9:::::::* cpe:2.3:a:fortinet:fortiauthenticator:6.5.0:::::::* cpe:2.3:a:fortinet:fortiauthenticator:6.5.1:::::::* cpe:2.3:a:fortinet:fortiauthenticator:6.5.2:::::::* cpe:2.3:a:fortinet:fortiauthenticator:6.5.3:::::::* cpe:2.3:a:fortinet:fortiauthenticator:6.5.4:::::::* cpe:2.3:a:fortinet:fortiauthenticator:6.5.5:::::::* cpe:2.3:a:fortinet:fortiauthenticator:6.5.6:::::::* cpe:2.3:a:fortinet:fortiauthenticator:6.5.7:::::::* cpe:2.3:a:fortinet:fortiauthenticator:6.6.0:::::::* cpe:2.3:a:fortinet:fortiauthenticator:6.6.1:::::::* cpe:2.3:a:fortinet:fortiauthenticator:6.6.2:::::::*
Vendors & Products		Fortinet Fortinet fortiauthenticator
References		https://fortiguard.fortinet.com/psirt/FG-IR-26-146
Metrics		cvssV3_1 `{'score': 7, 'vector': 'CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N/E:F/RL:O/RC:C'}`