CVE-2019-6520
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 · uneditedMoxa IKS and EDS does not properly check authority on server side, which results in a read-only user being able to perform arbitrary configuration changes.
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 confidenceMoxa IKS and EDS industrial Ethernet switches contain a server-side improper authorization vulnerability where the server fails to properly enforce permission boundaries. A read-only user account can bypass authorization checks to perform administrative-level configuration changes, effectively achieving privilege escalation through the web interface or management interface.
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<= 4.5<= 3.8<= 3.8<= 3.8CVSS 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
- None
- Integrity
- High
- Availability
- None
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/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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Identify device model and firmware versionAccess the device web interface or management console and locate the firmware version information, typically found under System > Device Information or a similar status/overview pageAffected if The firmware version matches one of the affected products: IKS G6824a with firmware <= 4.5, or EDS 405a/408a/510a with firmware <= 3.8
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Check for presence of read-only user accountsNavigate to the user management or account settings section in the web interface and review the list of defined user accounts and their assigned privilege levelsAffected if One or more read-only or low-privilege user accounts exist on the device, as these accounts can exploit the authorization bypass
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Verify management interface accessibilityDetermine if the web-based management interface is reachable from the network by attempting to access the device IP via HTTP/HTTPS or checking firewall rules and network access controlsAffected if The management interface is exposed to untrusted networks, as the vulnerability is exploited through this interface
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Audit configuration change logs for privilege escalationReview system logs, audit logs, or configuration change logs to identify any administrative-level configuration changes made by accounts with read-only or limited privilegesAffected if Configuration changes were performed by accounts that should only have read-only permissions, indicating successful exploitation of the authorization bypass
A user is affected if they operate a Moxa IKS G6824a or EDS 405a/408a/510a device with firmware at or below the affected version AND have read-only user accounts configured with access to the management interface.
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 vendor-supplied firmware patches when available; until then, restrict management access to trusted users only and consider network segmentation to limit exposure of the management interface.
- Consultation2.0 h
- Implementation4.0 h
- Testing3.0 h
- Review / QA2.0 h
An estimate, not a bill — we confirm scope with you before any work starts. Need it this week? Rush from $3,088.
Scan for this in your stack
Free · runs locallyCheck whether your project pulls in CVE-2019-6520 — 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-2019-6520 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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A place for practitioners to share what actually worked: a mitigation you’ve tested, a configuration change, a version- or environment-specific caveat, or a link to a verified patch. The most useful notes rise to the top as peers upvote them, so the signal stays high.
- 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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