CVE-2021-22338
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 an XXE injection vulnerability in eCNS280 V100R005C00 and V100R005C10. A module does not perform the strict operation to the input XML message. Attacker can send specific message to exploit this vulnerability, leading to the module denial of 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 confidenceThis is an XML External Entity (XXE) injection vulnerability in Huawei eCNS280 (V100R005C00 and V100R005C10). A module fails to properly validate or sanitize incoming XML messages, allowing attackers to send specially crafted XML payloads that exploit external entity processing, resulting in denial of service.
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= v100r005c00= v100r005c10CVSS 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
- Low
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L
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 eCNS280 firmware versionAccess the device management interface or check system information to determine the installed firmware version. Look for version identifier v100r005c00 or v100r005c10 in the system properties or about page.Affected if The installed firmware version is exactly v100r005c00 or v100r005c10
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Locate the XML processing moduleSearch the device filesystem or application directories for XML parser libraries or modules that handle incoming XML messages. Check configuration files for XML-handling components.Affected if An XML parsing module exists that processes incoming XML messages without explicit validation configuration visible
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Inspect XML parser configurationExamine the XML parser settings in the application configuration or code. Look for configuration options related to external entity processing, DOCTYPE handling, or entity resolution.Affected if External entity processing is enabled or the parser lacks explicit disabling of external entities (no 'external-general-entities', 'external-parameter-entities', or similar set to false/disabled)
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Review XML input validationInspect the code or configuration that handles incoming XML messages before parsing. Check for input validation routines, sanitization filters, or regex patterns that examine XML content.Affected if No input validation layer exists before XML parsing, or validation does not check for DOCTYPE declarations and entity references
The environment is affected if running eCNS280 firmware v100r005c00 or v100r005c10 with an XML parsing module that has external entity processing enabled or lacks XML input sanitization.
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 dataImplement strict XML input validation by disabling external entity processing in the affected XML parser configuration, and/or add XML sanitization/regex filtering before parsing to reject payloads containing doctype declarations and entity references.
- 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-2021-22338 — 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-2021-22338 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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