CVE-2023-49256
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 · uneditedIt is possible to download the configuration backup without authorization and decrypt included passwords using hardcoded static key.
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 vulnerability allows unauthenticated attackers to download configuration backups from the system. The backups contain passwords encrypted with a hardcoded static key, enabling trivial decryption of sensitive credentials.
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
- None
- User interaction
- None
- Scope
- Unchanged
- Confidentiality
- High
- Integrity
- None
- Availability
- None
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/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 device modelCheck the device model through web interface, SSH banner, or system information (e.g., 'show version' command, web admin panel header, or boot logs)Affected if Device is not a Hongdian H8951 4g Esp (unaffected)
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Check firmware versionLocate the firmware version in the device web interface, system settings, or CLI output (e.g., 'version' or 'system info' commands) and compare against 2310271149Affected if Firmware version is lower than 2310271149 (e.g., 2310271148 or earlier)
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Verify backup download accessibilityAttempt to access the configuration backup download endpoint (commonly found in admin/backup or settings/backup sections of the web interface) without providing any authentication credentialsAffected if Backup file downloads successfully without requiring login or authorization
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Examine backup for hardcoded keyExtract the downloaded backup file and inspect the encrypted content for a static, reusable encryption key or check if the same key appears across multiple backup filesAffected if Passwords are encrypted with a static key that remains unchanged across backups
Device is affected if it is a Hongdian H8951 with firmware < 2310271149 and the backup download feature is accessible without authentication using a hardcoded static encryption key.
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 proper authentication and authorization controls for backup download functionality, and replace the hardcoded static encryption key with proper key management (e.g., secrets management system, key rotation). Exposed credentials should be rotated.
H8951 4g Esp Firmware version 2310271149 or later
- Upgrade the H8951 4g Esp Firmware to version 2310271149 or later
- After upgrade, verify that the configuration backup now requires authentication
- Ensure default credentials have been changed from any factory defaults
- Verify that the hardcoded cryptographic key is no longer present in the firmware image
Generated from the published advisory — verify against the referenced sources before acting.
- Consultation4.0 h
- Implementation16.0 h
- Testing8.0 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 $8,960.
Scan for this in your stack
Free · runs locallyCheck whether your project pulls in CVE-2023-49256 — 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-2023-49256 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