FortiadcApplication · Fortinet
CVE-2019-6699
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 · uneditedAn improper neutralization of input vulnerability in Fortinet FortiADC 5.3.3 and earlier may allow an attacker to execute a stored Cross Site Scripting (XSS) via a field in the traffic group interface.
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 confidenceA stored Cross-Site Scripting (XSS) vulnerability in FortiADC versions 5.3.3 and earlier allows attackers to inject malicious JavaScript into a specific field within the traffic group interface. Since the payload is stored on the server, it executes whenever users view the affected interface, potentially compromising their sessions or stealing credentials.
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
FortiadcApplication
<= 5.3.3CVSS 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
- Low
- User interaction
- Required
- Scope
- Changed
- Confidentiality
- Low
- Integrity
- Low
- Availability
- None
CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:C/C:L/I:L/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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Check FortiADC firmware versionAccess the FortiADC CLI or web UI and retrieve the system firmware version (typically via 'get system status' in CLI or System > Settings in GUI)Affected if The installed version is 5.3.3 or earlier
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Verify traffic group interface accessNavigate to the traffic group configuration interface in the FortiADC web UI (typically under Resource > Traffic Group or similar)Affected if The traffic group interface is accessible and configured
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Inspect traffic group fields for injected scriptsExamine all input fields within the traffic group interface for any unexpected or suspicious JavaScript code patterns (such as <script> tags, event handlers like onload/onerror, or encoded payloads)Affected if Any field contains malicious JavaScript payloads or unrecognized script content
A system is affected if running FortiADC firmware version 5.3.3 or earlier AND the traffic group interface is accessible with suspicious script content present in its fields.
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 dataUpgrade FortiADC to version 5.4.0 or later to obtain the patched version. If immediate upgrading is not feasible, disable or restrict access to the traffic group interface and implement input validation as a temporary measure.
Fix this in Fortiadc
Scoped from the published advisory
- Consultation2.0 h
- Implementation2.0 h
- Testing2.0 h
- Review / QA1.0 h
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Scan for this in your stack
Free · runs locallyCheck whether your project pulls in CVE-2019-6699 — 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-2019-6699 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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