CVE-2020-8329
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 denial of service vulnerability was reported in the firmware prior to version 1.01 used in Lenovo Printer LJ4010DN that could be triggered by a remote user sending a crafted packet to the device, causing an error to be displayed and preventing printer from functioning until the printer is rebooted.
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 confidenceA denial of service vulnerability in Lenovo Printer LJ4010DN firmware prior to version 1.01 allows a remote attacker to cause printer dysfunction by sending a crafted packet. The attack triggers an error display and renders the printer non-functional until physically rebooted.
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< 1.01< 1.01< 1.01CVSS 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
- None
- Integrity
- None
- Availability
- High
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/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 printer modelAccess the printer's web interface or print a configuration page to confirm the exact model number. Look for LJ4010DN, LJ6700DN, or M8960dnf.Affected if The printer model is one of these three: LJ4010DN, LJ6700DN, or M8960dnf.
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Check the installed firmware versionAccess the printer's web interface under Settings or Status, or print a self-test/configuration page. Locate the firmware version field.Affected if The firmware version is lower than 1.01 (for example, 1.00 or earlier).
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Verify network accessibilityCheck the printer's IP address and determine if it is reachable from network segments outside your trusted internal network. Review firewall rules or access control lists that permit traffic to the printer.Affected if The printer is directly accessible from untrusted or external networks without firewall protection.
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Inspect printer status forDoS symptomsCheck the printer display panel or web interface status page. Look for error messages, a non-responsive web interface, or inability to accept print jobs.Affected if The printer displays an error, is non-responsive, or requires a physical power cycle to recover.
You are affected if your printer is a LJ4010DN, LJ6700DN, or M8960dnf model running firmware version lower than 1.01 and is network-accessible to potential attackers.
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 data1.01
Update printer firmware to version 1.01 or later. Apply network access controls to limit exposure to untrusted networks as a compensating control until the patch is applied.
- Consultation2.0 h
- Implementation2.0 h
- Testing2.0 h
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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-2020-8329 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
- No spam, self-promotion, credentials, or personal data