CVE-2021-27444
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 · uneditedThe Weintek cMT product line is vulnerable to various improper access controls, which may allow an unauthenticated attacker to remotely access and download sensitive information and perform administrative actions on behalf of a legitimate administrator.
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 confidenceThe Weintek cMT HMI product line contains multiple improper access control vulnerabilities allowing unauthenticated remote attackers to bypass authentication mechanisms, access sensitive system information, download configuration and data files, and execute administrative functions as if they were legitimate administrators.
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< 20210305< 20210305< 20210305< 20210305< 20210209< 20210209< 20210222< 20210222CVSS 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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Identify Weintek cMT HMI modelLocate the device model label on the HMI unit or access the device web interface to view system information. Look for model numbers such as cMT Svr 100, cMT Svr 102, cMT Svr 200, cMT Svr 202, cMT G01, cMT G02, cMT G03, or cMT G04.Affected if The device model matches any of the affected cMT product lines.
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Retrieve firmware versionAccess the device web interface (typically http://[device IP]) and navigate to System Settings or System Information to view the firmware build date. Alternatively, check the device label or use the manufacturer's utility software to query the firmware version.Affected if The firmware version cannot be determined or is older than the listed version thresholds.
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Compare against affected versionsFor cMT Svr models (100, 102, 200, 202), compare your firmware build date to 20210305. For cMT G01 and G02, compare to 20210209. For cMT G03 and G04, compare to 20210222. If the build date is earlier than these thresholds, the device is affected.Affected if The installed firmware version is earlier than 20210305 for Svr models, earlier than 20210209 for G01/G02, or earlier than 20210222 for G03/G04.
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Verify authentication mechanism exposureAttempt to access restricted device functions or configuration pages without providing credentials. If you can access administrative functions, system information, or download configuration files without authentication, the vulnerability is present and exploitable.Affected if Unauthenticated access to sensitive functions or data is possible.
A Weintek cMT HMI device running firmware versions earlier than the specified thresholds is affected by this improper access control 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.
dbcve · scoped202102092021022220210305
Isolate affected devices behind firewalls or network segmentation to limit exposure, apply vendor patches when available, and implement strong network monitoring for unauthorized access attempts.
Firmware 20210305 (Cmt Svr series) / 20210209 (Cmt G01/G02) / 20210222 (Cmt G03/G04) or later
- 1. Identify the specific Weintek cMT product model (Cmt Svr 100, Cmt Svr 102, Cmt Svr 200, Cmt Svr 202, Cmt G01, Cmt G02, Cmt G03, or Cmt G04) in your environment
- 2. Determine the current firmware version of the affected device via the device's web interface or administrative console
- 3. Download the corresponding firmware update from the official Weintek download site (dl.weintek.com) matching your product model
- 4. For Cmt Svr series devices: upgrade to firmware version 20210305 or later
- 5. For Cmt G01/G02 devices: upgrade to firmware version 20210209 or later
- 6. For Cmt G03/G04 devices: upgrade to firmware version 20210222 or later
- 7. After upgrading, verify the new firmware version is correctly installed
- 8. Review administrative accounts and access controls to ensure no unauthorized changes were made during the vulnerable period
Generated from the published advisory — verify against the referenced sources before acting.
- Consultation4.0 h
- Implementation8.0 h
- Testing6.0 h
- Review / QA2.0 h
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Scan for this in your stack
Free · runs locallyCheck whether your project pulls in CVE-2021-27444 — 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-2021-27444 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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