CVE-2016-6839
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 · uneditedCRLF injection vulnerability in Huawei FusionAccess before V100R006C00 allows remote attackers to inject arbitrary HTTP headers and conduct HTTP response splitting attacks via unspecified vectors.
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 confidenceCRLF injection vulnerability in Huawei FusionAccess allows remote attackers to inject arbitrary HTTP headers via unspecified vectors by embedding carriage return (\r) and line feed (\n) characters into input fields that are reflected in HTTP response headers, enabling HTTP response splitting attacks.
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= v100r005c10= v100r005c20= v100r005c30CVSS 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
- Required
- Scope
- Changed
- Confidentiality
- Low
- Integrity
- Low
- Availability
- None
CVSS:3.0/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N
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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Confirm Huawei FusionAccess installationCheck if FusionAccess is present on the system by looking for FusionAccess-related services or installation directories, such as checking the Windows service list or common installation paths.Affected if FusionAccess software is not found on the system.
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Identify installed FusionAccess versionRetrieve the version of the installed FusionAccess instance. This can typically be done via the FusionAccess administration console, by checking the software version information in the system about page, or by querying the installed packages if a Linux-based appliance.Affected if The version cannot be determined or the software is not FusionAccess.
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Compare version against affected rangesCompare the identified version against the affected versions: v100r005c10, v100r005c20, and v100r005c30. Exact match with any of these three versions indicates the system is running a vulnerable release.Affected if The installed version exactly matches v100r005c10, v100r005c20, or v100r005c30.
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Verify web interface is activeDetermine whether the FusionAccess web administration interface or any HTTP service is running and accessible, as the CRLF injection vulnerability affects HTTP response headers.Affected if The web interface is exposed and the vulnerable version is installed.
The system is affected if Huawei FusionAccess version v100r005c10, v100r005c20, or v100r005c30 is installed and the web interface is active.
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 dataUpgrade Huawei FusionAccess to version V100R006C00 or later to remediate this vulnerability.
- Consultation4.0 h
- Implementation8.0 h
- Testing4.0 h
- Review / QA2.0 h
An estimate, not a bill — we confirm scope with you before any work starts. Need it this week? Rush from $5,120.
Scan for this in your stack
Free · runs locallyCheck whether your project pulls in CVE-2016-6839 — 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-2016-6839 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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- Version or environment caveats, and links to real fixes
- No weaponised exploit code, or anything meant to cause harm
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