CVE-2018-6434
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 · uneditedA vulnerability in the web management interface of Brocade Fabric OS versions before 8.2.1, 8.1.2f, 8.0.2f, 7.4.2d could allow attackers to intercept or manipulate a user's session ID.
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 confidenceThis is a session hijacking vulnerability in the web management interface of Brocade Fabric OS. Attackers can intercept or manipulate user session IDs, potentially allowing unauthorized access to the management interface by hijacking legitimate user sessions.
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>= 7.4.2, < 7.4.2d>= 8.0.2, < 8.0.2f>= 8.1.2, < 8.1.2f>= 8.2.0, < 8.2.1CVSS 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
- High
- Availability
- None
CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/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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Identify Fabric OS versionConnect to the Brocade switch via CLI and run the command: `version` or `firmwareShow`. This displays the currently running Fabric OS version.Affected if The version displayed falls within any of these ranges: 7.4.2 through 7.4.2c, 8.0.2 through 8.0.2e, 8.1.2 through 8.1.2e, or 8.2.0 through 8.2.0.
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Verify web management interface statusRun the command `webserver --show` or `httpcfg` (depending on FOS version) to check if the web management interface (HTTP/HTTPS) is enabled on the device.Affected if The web management interface is enabled and accessible. If it is disabled, the vulnerability may not be exploitable in the current configuration.
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Confirm HTTP or HTTPS listener is activeRun `netstat -an | grep -E '80|443'` or check the output of `ipaddr` to determine if the device is listening on HTTP (port 80) or HTTPS (port 443) for management access.Affected if The device is listening on ports 80 or 443 for web management, indicating the vulnerable web interface is exposed.
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Assess network exposure of management interfaceReview the management network configuration by running `ipaddr -show` or checking VLAN settings to determine if the web interface is reachable from untrusted networks.Affected if The management interface is reachable from networks outside the trusted administrative network, increasing the risk of session hijacking exploitation.
A user is affected if the Fabric OS version falls within any of the affected version ranges AND the web management interface is enabled and accessible from the network.
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 data7.4.2d8.0.2f8.1.2f
Update Brocade Fabric OS to version 8.2.1 or later (or the appropriate patched version for each branch: 8.1.2f+, 8.0.2f+, or 7.4.2d+). If immediate patching is not possible, consider restricting access to the web management interface to trusted networks or VPN.
- Consultation3.0 h
- Implementation6.0 h
- Testing3.0 h
- Review / QA2.0 h
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Free · runs locallyCheck whether your project pulls in CVE-2018-6434 — 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-2018-6434 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
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