CVE-2023-49257
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 authenticated user is able to upload an arbitrary CGI-compatible file using the certificate upload utility and execute it with the root user privileges.
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 certificate upload utility in this application lacks proper file type validation, allowing an authenticated user to upload arbitrary CGI-compatible files. These uploaded files can then be executed by the web server with root user privileges, enabling complete system compromise.
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< 2310271149CVSS 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 the device modelAccess the device web interface or check the device label/markings to confirm it is a Hongdian H8951 4G ESP deviceAffected if The device is not a Hongdian H8951 model, this CVE does not apply
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Check the firmware versionLog into the device web interface and navigate to the status or system information page to view the installed firmware version, or use the command line and run 'AT+CGMR' or similar diagnostic commandAffected if The firmware version is earlier than 2310271149 (e.g., 2310271148 or older)
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Verify the certificate upload feature existsNavigate to the web interface and look for certificate management, upload, or SSL/TLS configuration sections (typically under Settings, Network, or Security menus)Affected if The certificate upload utility is present and accessible to authenticated users
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Check web server CGI configurationExamine the web server configuration files (typically in /etc/httpd or /etc/nginx directories on the device) to see if CGI execution is enabled in the upload or certificate directoriesAffected if CGI scripts can be executed from directories accessible to authenticated users, particularly the certificate upload directory
The device is affected if it is a Hongdian H8951 running firmware version lower than 2310271149 AND the certificate upload feature is accessible to authenticated users with CGI execution enabled on the web server.
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 · scoped2310271149
Implement strict allowlist-based file validation for the certificate upload utility, store uploaded files outside the web root, remove executable permissions, and ensure CGI scripts cannot be invoked from the upload directory.
H8951 4g Esp Firmware version 2310271149 or later
- Obtain the fixed firmware version (2310271149 or later) from the router vendor's official support website
- Access the H8951 4g Esp router's administrative web interface using browser credentials
- Navigate to the System/Firmware or Administration section containing the firmware upgrade option
- Upload the downloaded firmware file (version 2310271149 or later)
- Wait for the firmware upload and installation process to complete - do not power off the device
- After reboot, verify the firmware version has been updated successfully
- Confirm the certificate upload utility no longer allows arbitrary CGI file execution
Generated from the published advisory — verify against the referenced sources before acting.
- Consultation4.0 h
- Implementation12.0 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 $7,328.
Scan for this in your stack
Free · runs locallyCheck whether your project pulls in CVE-2023-49257 — 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-2023-49257 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