CVE-2021-27452
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 software contains a hard-coded password that could allow an attacker to take control of the merging unit using these hard-coded credentials on the MU320E (all firmware versions prior to v04A00.1).
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 MU320E merging unit contains a hard-coded password embedded in the firmware that could allow an unauthenticated attacker to gain administrative access and take control of the device. This vulnerability exists in all firmware versions prior to v04A00.1.
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< 04a00.1CVSS 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
- Local
- Complexity
- Low
- Privileges
- Low
- User interaction
- None
- Scope
- Unchanged
- Confidentiality
- High
- Integrity
- High
- Availability
- High
CVSS:3.1/AV:L/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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Check MU320E firmware versionAccess the device management interface (web UI, console, or management software) and navigate to the system information or firmware status section to retrieve the current firmware version stringAffected if The firmware version displayed is a version number lower than 04a00.1 (for example, 04a00.0, 03.x.x, or any earlier release)
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Compare version against the safe baselineTake the version string found in the previous step and compare it numerically or alphanumerically against '04A00.1' using the vendor's version numbering schemeAffected if The installed firmware version is below 04A00.1 in the version hierarchy
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Identify if hard-coded credential access is possibleAttempt to access the device administrative interface using the documented hard-coded credential (refer to CVE-2021-27452 references for the specific credential) or examine firmware dumps if accessibleAffected if Administrative access is granted using the embedded credential, confirming the hard-coded password is active
The device is affected if the installed MU320E firmware version is any version prior to v04A00.1, as all earlier versions contain the hard-coded password 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 data04a00.1
Upgrade the MU320E firmware to version v04A00.1 or later, which removes the hard-coded credentials. After updating, change default passwords to unique, strong credentials following vendor guidance.
- Consultation4.0 h
- Implementation2.0 h
- Testing4.0 h
- Review / QA2.0 h
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Scan for this in your stack
Free · runs locallyCheck whether your project pulls in CVE-2021-27452 — 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-2021-27452 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
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