CVE-2020-29491
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 · uneditedDell Wyse ThinOS 8.6 and prior versions contain an insecure default configuration vulnerability. A remote unauthenticated attacker could potentially exploit this vulnerability to gain access to the sensitive information on the local network, leading to the potential compromise of impacted thin clients.
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 confidenceDell Wyse ThinOS 8.6 and prior versions contain an insecure default configuration vulnerability that allows remote unauthenticated attackers to gain access to sensitive information on the local network, potentially compromising affected thin clients.
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<= 8.6CVSS 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
- Changed
- Confidentiality
- High
- Integrity
- None
- Availability
- None
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/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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Identify the device as Dell Wyse ThinOSAccess the thin client management interface or check the system information screen during boot. ThinOS devices typically show the model as 'Dell Wyse' with ThinOS branding.Affected if The device is a Dell Wyse thin client running ThinOS firmware
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Check the ThinOS firmware versionIn the ThinOS management console, navigate to System Setup > System Information, or view the version displayed on the boot screen. Compare the version number to 8.6.Affected if The installed version is 8.6 or any version prior to 8.6 (for example, 8.5, 8.4, etc.)
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Identify exposed network servicesFrom a network segment accessible to the thin client, scan for open ports using tools like nmap. Common ThinOS management ports include 80, 443, 8443, or 3389. Check if these services are reachable from untrusted networks.Affected if HTTP/HTTPS management interfaces or other services are accessible from unauthenticated network segments without firewall restrictions
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Review default credential statusAttempt to access the ThinOS management interface using known default credentials (typically admin/admin or administrator/password). If authentication succeeds without modification, the default credentials are still in use.Affected if The default administrative credentials have not been changed from manufacturer defaults
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Check for unnecessary enabled servicesIn the ThinOS configuration, review enabled network services such as FTP, Telnet, VNC, or remote desktop sharing features that may be enabled by default.Affected if Unnecessary network services are enabled that are not required for the deployment environment
If the device runs Dell Wyse ThinOS version 8.6 or lower with default configurations still in place (default credentials, exposed management interfaces, or unnecessary services enabled), the environment is affected by this insecure default configuration vulnerability.
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 dataReview and change insecure default configurations, disable unnecessary services, and apply vendor-provided security hardening guidelines or firmware updates to address the default configuration weakness.
- Consultation4.0 h
- Implementation8.0 h
- Testing4.0 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 $5,120.
Scan for this in your stack
Free · runs locallyCheck whether your project pulls in CVE-2020-29491 — 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-2020-29491 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
- No spam, self-promotion, credentials, or personal data