Sensitive information disclosure via out-of-bounds read
Published Jul 14, 2026 · Updated Jul 14, 2026
Out-of-bounds read in affected FortiAuthenticator 6.3 through 6.6 releases allows remote attackers to retrieve sensitive information. Fortinet has not disclosed the request handler or buffer operation that reads beyond its intended boundary when processing the crafted request. No authentication or user interaction is required, and the published impact is limited to disclosure without data modification or service interruption.
Summary
What happened
Out-of-bounds read in affected FortiAuthenticator 6.3 through 6.6 releases allows remote attackers to retrieve sensitive information. Fortinet has not disclosed the request handler or buffer operation that reads beyond its intended boundary when processing the crafted request. No authentication or user interaction is required, and the published impact is limited to disclosure without data modification or service interruption.
The record
- CVE
- CVE-2025-53379
- Published
- Jul 14, 2026
- Updated
- Jul 14, 2026
- Vendor
- Fortinet
- Product
- FortiAuthenticator
- Classifications
- CWE-125, T1190
- Attack vector
- network
- Privileges
- unauthenticated
Timeline
How it unfolded
- Jul 14, 2026CVE publishedPublication date reported by the CVE source.
- Jul 14, 2026Record updatedLatest update available in the CVE record.
Exploitability
Present is not the same as exploitable
Compare your product and version with the public record. A matching version still requires validation against your environment.
Is a vulnerable build present?
Compare these published version ranges with your installed build and any vendor patches.
- Affected versionversion=6.3.0 <=6.3.5
- Affected versionversion=6.4.0 <=6.4.11
- Affected versionversion=6.5.0 <=6.5.7
- Affected versionversion=6.6.0 <=6.6.2
What conditions does exploitation require?
What is affected?
Attacks
What attackers are doing with it
Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.
Public exploit references
No public exploit references are available in this record.
Labels summarize the accepted research assessment. They do not indicate a test against your environment.
Technologies
Your stack
See the directory against your own environment.
Your stack
Check the software in your environment
Book a demo to see how Hinoki identifies affected software and validates exploitability in your environment.
Book a demo