CVE-2020-29490
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 · uneditedDell EMC Unity, Unity XT, and UnityVSA versions prior to 5.0.4.0.5.012 contain a Denial of Service vulnerability on NAS Servers with NFS exports. A remote authenticated attacker could potentially exploit this vulnerability and cause Denial of Service (Storage Processor Panic) by sending specially crafted UDP requests.
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 confidenceDell EMC Unity, Unity XT, and UnityVSA versions prior to 5.0.4.0.5.012 contain a denial-of-service vulnerability affecting NAS Servers with NFS exports. A remote authenticated attacker can send specially crafted UDP requests to trigger a Storage Processor Panic, causing complete unavailability of the storage system services.
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< 5.0.4.0.5.012< 5.0.4.0.5.012< 5.0.4.0.5.012CVSS 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
- None
- Integrity
- None
- Availability
- High
CVSS:3.1/AV:N/AC:L/PR:L/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 installed product modelLog into Unisphere or use the service CLI (svc_info / uemcli) to retrieve the system model name (Unity, Unity XT, or UnityVSA)Affected if The model is Unity, Unity XT, or UnityVSA and the version is below 5.0.4.0.5.012
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Retrieve the installed software versionUse the service CLI command 'uemcli -d localhost show system' or check Unisphere under Support > Software Version to obtain the exact Operating Environment versionAffected if The version is less than 5.0.4.0.5.012 (for example, 5.0.3.x or earlier)
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Verify if NAS Servers with NFS exports existIn Unisphere, navigate to Storage > NAS Servers or use the CLI command 'nas_server -list' to check for configured NAS serversAffected if Any NAS server is present with NFS exports enabled (the vulnerability requires NFS exports to be configured)
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Confirm UDP NFS port exposureCheck network configuration to verify if UDP port 2049 (NFS) or other NFS-related UDP ports are open to untrusted networksAffected if The NAS server NFS service is reachable via UDP from outside trusted networks
You are affected if your system is Dell EMC Unity, Unity XT, or UnityVSA with a version below 5.0.4.0.5.012 and has NAS servers configured with NFS exports accessible over UDP.
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 data5.0.4.0.5.012
Upgrade Dell EMC Unity, Unity XT, or UnityVSA to version 5.0.4.0.5.012 or later. Until patched, consider restricting NFS access to trusted networks and monitoring for anomalous UDP traffic patterns.
- Consultation4.0 h
- Implementation6.0 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-2020-29490 — 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-2020-29490 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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