CVE-2021-22393
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 · uneditedThere is a denial of service vulnerability in some versions of CloudEngine 5800, CloudEngine 6800, CloudEngine 7800 and CloudEngine 12800. The affected product cannot deal with some messages because of module design weakness . Attackers can exploit this vulnerability by sending a large amount of specific messages to cause denial of service. This can compromise normal service.
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 confidenceA denial of service vulnerability exists in Huawei CloudEngine switch series (5800, 6800, 7800, 12800) due to a module design weakness that cannot properly handle certain specific messages. Attackers can exploit this by sending a large volume of these crafted messages to cause the affected devices to become unresponsive, disrupting normal network 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= v200r002c50spc800= v200r003c00spc810= v200r005c00spc800= v200r005c10spc800= v200r002c50spc800= v200r003c00spc810= v200r005c00spc800= v200r005c10spc800= v200r002c50spc800= v200r003c00spc810= v200r005c00spc800= v200r005c10spc800= v200r002c50spc800= v200r003c00spc810= v200r005c00spc800= v200r005c10spc800CVSS 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 CloudEngine switch modelRun 'display device' or check device labeling to confirm the model is 5800, 6800, 7800, or 12800Affected if Model is one of 5800, 6800, 7800, or 12800 series
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Check firmware versionRun 'display version' or 'display device version' to obtain the installed firmware versionAffected if Version matches v200r002c50spc800, v200r003c00spc810, v200r005c00spc800, or v200r005c10spc800 exactly
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Verify network exposureCheck if the device management interface or network ports are reachable from untrusted networks using 'display ip interface' or reviewing ACL configurationsAffected if Device accepts traffic from untrusted sources on ports handling the affected module messages
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Check device responsivenessPing the device or run 'display cpu' to verify the device is responsive and not experiencing high CPU usage from message processingAffected if Device shows high CPU usage or is unresponsive to normal management queries
Your environment is affected if you have a CloudEngine 5800/6800/7800/12800 running any of the exact versions v200r002c50spc800, v200r003c00spc810, v200r005c00spc800, or v200r005c10spc800 and the device processes network traffic from untrusted sources.
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 dataApply vendor-supplied patches for CloudEngine devices when available. Implement network segmentation and traffic filtering to limit exposure to untrusted sources, and monitor for anomalous message patterns.
- Consultation4.0 h
- Implementation8.0 h
- Testing4.0 h
- Review / QA2.0 h
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Free · runs locallyCheck whether your project pulls in CVE-2021-22393 — 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-2021-22393 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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