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Application Delivery Controller FirmwareOperating system · Citrix

CVE-2020-8246

HIGH · 7.5 CVSS v3.1 Published 2020-09-18
Fix available
A fix is available. Upgrade to 10.2.7b / 11.0.3f or later.
See remediation →
84/100
Remediation priority · High
Remotely reachable No privileges Zero-click

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 · unedited
Citrix ADC and Citrix Gateway 13.0 before 13.0-64.35, Citrix ADC and NetScaler Gateway 12.1 before 12.1-58.15, Citrix ADC 12.1-FIPS before 12.1-55.187, Citrix ADC and NetScaler Gateway 12.0, Citrix ADC and NetScaler Gateway 11.1 before 11.1-65.12, Citrix SD-WAN WANOP 11.2 before 11.2.1a, Citrix SD-WAN WANOP 11.1 before 11.1.2a, Citrix SD-WAN WANOP 11.0 before 11.0.3f, Citrix SD-WAN WANOP 10.2 before 10.2.7b are vulnerable to a denial of service attack originating from the management network.

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 confidence

Citrix ADC, Citrix Gateway, NetScaler Gateway, and Citrix SD-WAN WANOP devices contain a denial of service vulnerability that can be exploited from the management network. An unauthenticated attacker on the management network can send specially crafted requests to trigger the DoS condition, causing the affected device to become unresponsive or crash.

MitigationApply the vendor-provided patches for the specific product version (13.0-64.35, 12.1-58.15, 11.1-65.12, or respective SD-WAN WANOP updates) and consider network segmentation to restrict management interface access to trusted networks only.

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
Application Delivery Controller FirmwareOperating system
Affected:>= 11.1, < 11.1-65.12>= 12.1, < 12.1-58.15>= 13.0, < 13.0-64.35
GatewayApplication
Affected:>= 11.1, < 11.1-65.12>= 13.0, < 13.0-64.35
Netscaler GatewayApplication
Affected:>= 12.1, < 12.1-58.15
Sd Wan WanopOperating system
Affected:>= 10.2, < 10.2.7b>= 11.0, < 11.0.3f>= 11.1, < 11.1.2a>= 11.2, < 11.2.1a

CVSS 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 checks

Work through these to decide whether this CVE applies to you.

  1. Identify Citrix product and firmware version
    Log into the device CLI and run 'show version' or 'nsversion' command, or access the web interface System Information page under Diagnostics
    Affected if The version shown falls within any of these ranges: Citrix ADC/Gateway 11.1 before 11.1-65.12, 12.1 before 12.1-58.15, or 13.0 before 13.0-64.35; SD-WAN WANOP 10.2 before 10.2.7b, 11.0 before 11.0.3f, 11.1 before 11.1.2a, or 11.2 before 11.2.1a
  2. Confirm the specific Citrix product variant
    Run 'show hardware' or check the web interface license information to determine if the device is running as Citrix ADC, Citrix Gateway, NetScaler Gateway, or SD-WAN WANOP
    Affected if The device is any of these products and the version from step 1 matches the affected ranges for that specific product
  3. Verify management interface exposure
    Check network configuration via 'show ip' or the web interface under Network > IP Addresses. Determine if the management interface (typically IP with nsip, nsip6, or management IP) is reachable from untrusted networks
    Affected if The management interface IP is accessible from networks beyond trusted administration staff
  4. Check device availability and crash indicators
    Run 'show system' or 'show techsupport' and review recent system logs for unexpected restarts, core dumps, or periods of unresponsiveness
    Affected if The device shows signs of unexpected crashes or downtime that align with the timing of potential exploitation from the management network

You are affected if your Citrix ADC, Gateway, NetScaler Gateway, or SD-WAN WANOP device runs a firmware version listed in the affected ranges and has its management interface reachable from networks where untrusted attackers could send crafted requests.

Generated from the published advisory. Verify against your own configuration.

Check your environment

Paste your version and any relevant configuration and it will be compared against the affected criteria above. Do not include secrets or credentials.

AI-assisted, checked against the advisory. Informational, not a guarantee.

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 data
Upgrade available Upgrade to 10.2.7b / 11.0.3f / 11.1.2a or later
Fixed in 10.2.7b11.0.3f11.1.2a
Interim mitigation

Apply the vendor-provided patches for the specific product version (13.0-64.35, 12.1-58.15, 11.1-65.12, or respective SD-WAN WANOP updates) and consider network segmentation to restrict management interface access to trusted networks only.

Fix this in Application Delivery Controller Firmware Scoped from the published advisory
  • Consultation2.0 h
  • Implementation4.0 h
  • Testing6.0 h
  • Review / QA2.0 h
14.0 hours of engineering $2,380
Get the upgrade done

An estimate, not a bill — we confirm scope with you before any work starts. Need it this week? Rush from $3,808.

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References Go to the primary sourcePrimary sources — vendor advisories, patches and trackers. Where our summary and a reference disagree, the reference wins.

Primary sources

Practitioner notes

Contributed

Peer-ranked notes from engineers who’ve handled CVE-2020-8246 in production — separate from our analysis above.

No notes yet

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What this is

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.

What belongs here
  • 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
  • No spam, self-promotion, credentials, or personal data