FortiwebApplication · Fortinet
CVE-2023-42784
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 handling of syntactically invalid structure in Fortinet FortiWeb at least verions 7.4.0 through 7.4.6 and 7.2.0 through 7.2.10 and 7.0.0 through 7.0.10 allows attacker to execute unauthorized code or commands via HTTP/S crafted requests.
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 confidenceImproper handling of syntactically invalid structure in Fortinet FortiWeb WAF allows unauthenticated attackers to execute arbitrary code or commands via crafted HTTP/HTTPS requests. This is a remote code execution vulnerability in the web application firewall product affecting versions 7.4.0-7.4.6, 7.2.0-7.2.10, and 7.0.0-7.0.10.
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
FortiwebApplication
>= 7.0.0, < 7.4.7CVSS 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
- High
- Availability
- High
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
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 FortiWeb installed versionAccess the FortiWeb web UI or CLI and retrieve the firmware version. In CLI, run: get system status. Alternatively, check via FortiView or in the system information page of the web interface.Affected if The installed version is 7.0.0 through 7.0.10, 7.2.0 through 7.2.10, or 7.4.0 through 7.4.6 (any version >= 7.0.0 and < 7.4.7).
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Identify management interface exposureReview network configuration to determine if the FortiWeb management interface (HTTP/HTTPS on ports 80/443 or the admin GUI port) is accessible from untrusted networks. Check firewall policies and ACLs protecting the management interface.Affected if The management interface or web UI is reachable from the internet or untrusted internal networks without proper access controls.
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Check for WAF HTTP/HTTPS services enabledVerify whether the FortiWeb WAF is actively processing HTTP/HTTPS traffic for protected applications. In the web UI, navigate to Network > Interface or check the server pool configuration to see which interfaces have HTTP/HTTPS services enabled.Affected if FortiWeb is configured to handle HTTP/HTTPS traffic on any interface accessible to attackers, as the vulnerability is exploited via crafted HTTP/HTTPS requests.
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Review access logging for anomalous requestsExamine FortiWeb attack logs, HTTP traffic logs, and audit logs for suspicious patterns or malformed requests that could indicate exploitation attempts. Look for logs with malformed headers, unusual payload structures, or requests to non-standard paths.Affected if Logs show unusual malformed HTTP requests, authentication bypass attempts, or unexpected code execution indicators.
A user is affected if their FortiWeb version falls within 7.0.0-7.4.6 and the management or WAF HTTP interface is exposed to untrusted networks.
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.
dbcve · scoped7.4.7
Upgrade FortiWeb to patched versions (7.4.7 or later, 7.2.11 or later, 7.0.11 or later) as the primary remediation. If immediate patching is not possible, restrict management interface access to trusted networks via ACLs or VPN.
7.4.7 (or 7.2.11+, 7.0.11+)
- 1. Identify the current FortiWeb version using the web UI (System > Status) or CLI: 'get system status'
- 2. For FortiWeb 7.4.x: Upgrade to version 7.4.7 or later
- 3. For FortiWeb 7.2.x: Upgrade to version 7.2.11 or later
- 4. For FortiWeb 7.0.x: Upgrade to version 7.0.11 or later
- 5. Download the firmware from Fortinet Customer Support portal or FortiGuard
- 6. Upload and install the new firmware via FortiWeb web UI (System > Maintenance > Firmware) or CLI: 'execute firmware upgrade'
- 7. After upgrade, verify the new version is running: 'get system status'
- 8. Test that HTTP/S services function normally after the upgrade
Generated from the published advisory — verify against the referenced sources before acting.
Fix this in Fortiweb
Scoped from the published advisory
- Consultation4.0 h
- Implementation8.0 h
- Testing6.0 h
- Review / QA4.0 h
An estimate, not a bill — we confirm scope with you before any work starts. Need it this week? Rush from $6,176.
Scan for this in your stack
Free · runs locallyCheck whether your project pulls in CVE-2023-42784 — 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-2023-42784 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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- Version or environment caveats, and links to real fixes
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