CVE-2021-27448
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 · uneditedA miscommunication in the file system allows adversaries with access to the MU320E to escalate privileges 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 · moderate confidenceThe MU320E contains a file system miscommunication flaw that allows authenticated adversaries with device access to escalate privileges. The vulnerability stems from improper access control or validation in the file system layer, enabling a low-privileged user to gain elevated (likely administrative) permissions.
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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Identify the MU320E firmware versionAccess the device web interface, management console, or system information page to retrieve the currently installed firmware version numberAffected if The firmware version is lower than 04a00.1 (e.g., 04a00.0 or any earlier version)
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Verify if default or low-privilege user accounts existReview the user account configuration on the device through the administrative interface to list all defined users and their assigned privilege levelsAffected if The device has user accounts with limited (non-administrative) permissions configured alongside administrator accounts
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Confirm device is network accessible to untrusted usersCheck network configuration and access controls to determine if the device management interface is reachable by untrusted network segments or unauthorized usersAffected if The device management interface is accessible from network segments that include untrusted or unverified users
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Review authentication logs for privilege escalation indicatorsExamine device event logs, authentication logs, or audit trails for successful logins by lower-privilege users followed by privilege changes or administrative actionsAffected if Logs show any privilege escalation attempts or actions performed by accounts that originally had limited permissions
The environment is affected if the MU320E device runs firmware version prior to 04a00.1 AND has low-privilege user accounts that could be exploited by an authenticated attacker with device access.
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
Update MU320E firmware to v04A00.1 or later. Until patched, restrict physical and network access to trusted personnel only and monitor for unauthorized access attempts.
- Consultation4.0 h
- Implementation2.0 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 $3,392.
Scan for this in your stack
Free · runs locallyCheck whether your project pulls in CVE-2021-27448 — 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-2021-27448 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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