FortiisolatorWeb server / proxy · Fortinet
CVE-2021-41020
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 access control vulnerability [CWE-284] in FortiIsolator versions 2.3.2 and below may allow an authenticated, non privileged attacker to regenerate the CA certificate via the regeneration URL.
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 · high confidenceFortiIsolator versions 2.3.2 and below contain an improper access control vulnerability (CWE-284) that allows authenticated non-privileged users to regenerate CA certificates through a dedicated regeneration URL. This action should be restricted to administrators or privileged users only, but the lack of proper authorization checks permits any authenticated user to regenerate the CA certificate.
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
FortiisolatorWeb server / proxy
>= 2.3.0, < 2.3.3CVSS 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
- None
- Scope
- Unchanged
- Confidentiality
- High
- Integrity
- High
- Availability
- High
CVSS:3.1/AV:N/AC:L/PR:L/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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Identify FortiIsolator installation and versionLocate the FortiIsolator instance in your environment and determine the installed version number. This is typically visible in the product web GUI under System > Settings or via CLI commands such as 'get system status' or 'diagnose system version'.Affected if The installed version is 2.3.0, 2.3.1, or 2.3.2 (any version >= 2.3.0 but < 2.3.3).
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Verify the CA certificate regeneration endpoint is accessibleLocate or infer the CA certificate regeneration URL endpoint within FortiIsolator. This is typically found under System > Certificates or a similar certificate management section of the web interface.Affected if The CA certificate regeneration functionality exists and is reachable through a dedicated URL or API endpoint within the product.
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Test authorization controls on CA certificate regenerationLog in to FortiIsolator using a non-privileged or standard user account (one without administrator rights). Attempt to access the CA certificate regeneration URL or initiate a certificate regeneration action.Affected if An authenticated non-privileged user can successfully regenerate CA certificates, indicating the authorization check is missing or insufficient.
Your environment is affected if FortiIsolator version is between 2.3.0 and 2.3.2 inclusive AND any authenticated user (including non-privileged users) can access the CA certificate regeneration functionality without proper authorization enforcement.
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 · scoped2.3.3
Upgrade FortiIsolator to a version above 2.3.2, or implement proper access control restrictions to ensure the CA certificate regeneration functionality is only accessible to privileged users.
FortiIsolator 2.3.3 or later
- Download FortiIsolator version 2.3.3 or later from Fortinet's official support portal
- Review Fortinet's upgrade documentation for FortiIsolator before proceeding
- Apply the upgrade to your FortiIsolator instance following standard upgrade procedures
- Verify the upgrade was successful and the version is 2.3.3 or higher
Generated from the published advisory — verify against the referenced sources before acting.
Fix this in Fortiisolator
Scoped from the published advisory
- Consultation2.0 h
- Implementation2.0 h
- Testing2.0 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 $1,984.
Scan for this in your stack
Free · runs locallyCheck whether your project pulls in CVE-2021-41020 — 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-2021-41020 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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