FortiauthenticatorApplication · Fortinet
CVE-2025-53379
Official description Straight from the sourceThe vendor's or NVD's own wording, published unedited. Authoritative, but often terse — it says what broke, rarely what to do.
NVD · uneditedA 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.
Technical summary Written by usOur analysis, written from the advisory, the CVSS vector and the affected-version data. It adds context the advisory leaves out, and never invents facts that are not in the source.
dbcve analysis · moderate confidenceAn out-of-bounds read vulnerability in FortiAuthenticator versions 6.6.0-6.6.2 and all 6.5 versions allows remote unauthenticated attackers to retrieve sensitive information via specially crafted HTTP requests. The vulnerability stems from improper bounds checking in the request handling logic.
Verify against the referenced sources before acting — the references below are authoritative for this CVE, this summary is not.
Affected products & versions What the vendor confirmedThe version ranges the vendor confirmed as vulnerable. If your version sits inside a range here, treat yourself as exposed until you have upgraded.
NVD · CPE data
FortiauthenticatorApplication
>= 6.5.0, <= 6.5.7>= 6.6.0, <= 6.6.2CVSS breakdown How the score is builtThe industry scoring standard. It rates how the flaw is reached, what it takes to exploit, and what an attacker gains — the score is derived from those, not the other way round.
From the vector- Attack vector
- Network
- Complexity
- Low
- Privileges
- None
- User interaction
- None
- Scope
- Unchanged
- Confidentiality
- High
- Integrity
- None
- Availability
- None
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N
Am I affected? How to checkSteps we derive from the advisory and the affected-version data, so you can decide whether this CVE reaches your setup. They are a guide, not a scan — your own configuration is the authority.
dbcve checksWork through these to decide whether this CVE applies to you.
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Determine FortiAuthenticator installed versionLog into the FortiAuthenticator CLI and run the command: get system status. Alternatively, access the web UI login page or dashboard to view the firmware version.Affected if The displayed version is between 6.5.0 and 6.5.7 inclusive, or between 6.6.0 and 6.6.2 inclusive.
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Verify management interface network exposureReview firewall rules or network configuration to determine if the FortiAuthenticator management interface (typically ports HTTP 80 or HTTPS 443) is accessible from untrusted or external networks.Affected if The management interface is directly exposed to the internet or to networks outside the trusted internal network.
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Inspect HTTP access logs for anomalous requestsAccess the FortiAuthenticator logs via the web UI (Log & Report > Event Log) or CLI (execute log filter ... and execute log view ...) and search for unusual or malformed HTTP requests, especially from unauthorized IP addresses.Affected if Logs contain unusual HTTP request patterns that may indicate exploitation attempts.
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Check for unexpected sensitive information disclosureReview system logs, authentication logs, and any exported data for signs that sensitive information (such as session tokens, user credentials, or internal system data) was retrieved unexpectedly.Affected if Logs or system outputs show information that should not be accessible to unauthenticated users.
You are affected if your FortiAuthenticator version is 6.5.0-6.5.7 or 6.6.0-6.6.2 AND the management interface is reachable from untrusted networks, as this allows remote unauthenticated attackers to exploit the out-of-bounds read.
Generated from the published advisory. Verify against your own configuration.
Remediation Closing itWhat it takes to close this. Where a vendor fix exists we point at it; where none exists we say so plainly, and can build one. Effort estimates are scoped from the advisory, not from your codebase.
From vendor dataApply Fortinet's available patch for FortiAuthenticator or upgrade to a fixed version as indicated in the vendor advisory. Until patched, restrict access to FortiAuthenticator management interfaces from untrusted networks.
Fix this in Fortiauthenticator
Scoped from the published advisory
- Consultation2.0 h
- Implementation4.0 h
- Testing3.0 h
- Review / QA1.0 h
An estimate, not a bill — we confirm scope with you before any work starts. Need it this week? Rush from $2,800.
Scan for this in your stack
Free · runs locallyCheck whether your project pulls in CVE-2025-53379 — or any other known-vulnerable package — straight from your lock files. Free and open source; it runs locally and uploads nothing.
References Go to the primary sourcePrimary sources — vendor advisories, patches and trackers. Where our summary and a reference disagree, the reference wins.
Primary sourcesPractitioner notes
ContributedPeer-ranked notes from engineers who’ve handled CVE-2025-53379 in production — separate from our analysis above.
The advisory tells you what broke. It rarely tells you what actually worked. If you’ve dealt with this one, that detail is what the next engineer is searching for.
- The version that genuinely resolved it — not the one the vendor claimed
- A config change or rule that shut the vector down
- A gotcha in the upgrade path that cost you an afternoon
No notes yet
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- Verified mitigations, workarounds, and config changes
- Version or environment caveats, and links to real fixes
- No weaponised exploit code, or anything meant to cause harm
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