Review reviewHigh

CVE-2025-53379

Fortinet FortiAuthenticator, fortiauthenticator

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.

CVSS
7.5
EPSS
0.39%
31.2% percentile
CISA KEV
Not listed
Published
2026.07.15
PRIORITY ASSESSMENT

Review review

The CVSS severity warrants an early asset and exposure review.

Known exploitationNot established by KEV
Exploit probability0.39%
Technical severityCVSS 7.5

Vulnerability overview

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 product and versions

Product
Fortinet FortiAuthenticator, fortiauthenticator
Affected versions
>= 6.6.0 <= 6.6.2, >= 6.5.0 <= 6.5.7, >= 6.4.0 <= 6.4.11, >= 6.3.0 <= 6.3.5
Fixed versions
No verified fixed-version field is available yet

Recommended response sequence

Confirm exposure before applying a vendor-supported change.

Full remediation guide
  1. 1
    Identify

    Confirm that Fortinet FortiAuthenticator, fortiauthenticator and an affected version are present.

  2. 2
    Prioritize

    Combine exploitation signals with asset exposure and business criticality.

  3. 3
    Remediate

    Follow the vendor advisory or supported update path and preserve rollback options.

  4. 4
    Verify

    Recheck the version, service health, access paths, and relevant logs.

Technical data

CVSS vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N
CWE
CWE-125
CVE-2025-53379 — Fortinet FortiAuthenticator, fortiauthenticator | SECUFOCUS NOW