Netscaler Application Delivery Controller FirmwareOperating system · Citrix
CVE-2013-6938
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 · uneditedUnspecified vulnerability in the Service VM in Citrix NetScaler SDX 9.3 before 9.3-64.4 and 10.0 before 10.0-77.5 and Application Delivery Controller (ADC) 9.3.x before 9.3-64.4, 10.0 before 10.0-77.5, and 10.1 before 10.1-118.7 allows attackers to cause a denial of service via unknown vectors, related to the "Virtual Machine Daemon."
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 confidenceDenial of service vulnerability in the Virtual Machine Daemon component of the Service VM in Citrix NetScaler SDX and ADC appliances. The vulnerability allows remote attackers to cause a DoS condition through unknown attack vectors targeting the VM daemon 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
Netscaler Application Delivery Controller FirmwareOperating system
= 9.3\(1\)= 9.3.e= 10.0= 10.1CVSS 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
- Authentication
- None
- Confidentiality
- None
- Integrity
- None
- Availability
- Partial
AV:N/AC:L/Au:N/C:N/I:N/A:P
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 NetScaler appliance modelAccess the appliance CLI via SSH or the management GUI. Run 'show hardware' or check the system information to confirm if the device is an SDX or ADC model.Affected if The device is a NetScaler SDX or ADC appliance running the affected firmware versions.
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Check the firmware versionRun 'show version' in the CLI or view the version information in the management interface. Note the exact firmware build number.Affected if The firmware version is exactly 9.3(1), 9.3.e, 10.0, or 10.1 (without the cited security patches applied).
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Verify the Virtual Machine Daemon is in useRun 'show vm' or 'show service vm' in the CLI to check if the VM daemon service is configured. On SDX models, verify if the Service VM feature is enabled.Affected if The Virtual Machine Daemon or Service VM component is actively running on the appliance.
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Review recent daemon service logsCheck /var/log/vm.log or run 'nslog' with VM daemon facility if accessible. Look for crash events, unexpected restarts, or error messages related to the VM daemon service.Affected if The logs show evidence of daemon crashes or unexpected service interruptions without an assigned cause.
You are affected if you run a NetScaler SDX or ADC appliance with firmware version 9.3(1), 9.3.e, 10.0, or 10.1 and the Virtual Machine Daemon or Service VM feature is enabled.
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 Citrix patches 9.3-64.4, 10.0-77.5, or 10.1-118.7 (or later) to the affected NetScaler SDX and ADC deployments, and schedule appropriate maintenance windows for patch deployment.
Fix this in Netscaler Application Delivery Controller Firmware
Scoped from the published advisory
- Consultation4.0 h
- Implementation6.0 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 $4,544.
Scan for this in your stack
Free · runs locallyCheck whether your project pulls in CVE-2013-6938 — 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-2013-6938 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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A place for practitioners to share what actually worked: a mitigation you’ve tested, a configuration change, a version- or environment-specific caveat, or a link to a verified patch. The most useful notes rise to the top as peers upvote them, so the signal stays high.
- 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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