CVE-2021-40008
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 memory leak vulnerability in CloudEngine 12800 V200R019C00SPC800, CloudEngine 5800 V200R019C00SPC800, CloudEngine 6800 V200R019C00SPC800 and CloudEngine 7800 V200R019C00SPC800. The software does not sufficiently track and release allocated memory while parse a series of crafted binary messages, which could consume remaining memory. Successful exploit could cause memory exhaust.
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 memory leak vulnerability exists in Huawei CloudEngine 12800, 5800, 6800, and 7800 switches running V200R019C00SPC800 firmware. When parsing a series of crafted binary messages, the software fails to properly release allocated memory, causing progressive memory consumption until exhaustion occurs.
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= v200r019c00spc800= v200r019c00spc800= v200r019c00spc800= v200r019c00spc800CVSS 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 CloudEngine switch modelRun 'display device' or 'display version' command via console or SSH to confirm the device is a CloudEngine 12800, 5800, 6800, or 7800Affected if Device model is NOT one of: CloudEngine 12800, CloudEngine 5800, CloudEngine 6800, or CloudEngine 7800
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Check the firmware versionRun 'display version' command and locate the software version string. Confirm it equals exactly V200R019C00SPC800Affected if Firmware version does NOT equal V200R019C00SPC800 exactly (patches or other SP versions may differ)
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Verify network exposure to untrusted sourcesReview the device network configuration using 'display ip interface brief' and 'display current-configuration | include ip address' to determine if management or parsing interfaces are reachable from untrusted network segmentsAffected if The device management interface or parsing-enabled interfaces are exposed to untrusted or public networks without firewall filtering
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Check for memory exhaustion symptomsRun 'display memory-usage' command periodically or review SNMP monitoring data for signs of progressively increasing memory utilization over timeAffected if Memory usage shows abnormal progressive increase or consistently high utilization approaching limits
The environment is affected only if the device is a CloudEngine 12800/5800/6800/7800 running exactly firmware version V200R019C00SPC800 and is exposed to network sources that could send crafted binary messages.
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 the vendor-provided firmware patch to address the memory leak. If patching is immediately unavailable, consider network segmentation to limit exposure and implement memory monitoring alerts for affected devices.
- Consultation4.0 h
- Implementation8.0 h
- Testing6.0 h
- Review / QA4.0 h
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Free · runs locallyCheck whether your project pulls in CVE-2021-40008 — 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-2021-40008 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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