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Application Delivery Controller FirmwareOperating system · Citrix

CVE-2020-8247

HIGH · 8.8 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 →
94/100
Remediation priority · Urgent
Remotely reachable 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 escalation of privileges on the management interface.

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 confidence

This is a privilege escalation vulnerability affecting the management interface of Citrix ADC, Citrix Gateway, NetScaler Gateway, and SD-WAN WANOP appliances. An authenticated attacker with limited privileges on the management interface can escalate to higher privileges, potentially gaining administrative access.

MitigationApply the vendor-supplied patches: upgrade to Citrix ADC 13.0-64.35+, 12.1-58.15+, 11.1-65.12+ or respective fixed SD-WAN WANOP versions. Restrict management interface access to trusted networks until patched.

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
Low
User interaction
None
Scope
Unchanged
Confidentiality
High
Integrity
High
Availability
High

CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/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 the Citrix product and version
    Access the management interface (GUI or CLI) and navigate to System Information or run 'show version' / 'nsversion' command. Alternatively, check the login page banner or About page for version details.
    Affected if The displayed version falls within any of these ranges: ADC/Gateway 11.1 before 65.12, 12.1 before 58.15, 13.0 before 64.35; NetScaler Gateway 12.1 before 58.15; 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 management interface is accessible
    Verify that the management interface (NSGUI on port 443/80 or SSH CLI) is reachable. This vulnerability requires access to the management interface, not the VPN or gateway service.
    Affected if The management interface is exposed and reachable (even on internal networks). The flaw affects the management UI/CLI specifically.
  3. Check for non-administrator user accounts
    In the management interface, go to Configuration > System > User Administration > Users, or run 'show system user' via CLI to list configured users.
    Affected if There exists any user account with limited (non-superuser) privileges. An attacker with such an account could attempt privilege escalation.
  4. Review user privilege assignments
    Run 'show system user' or inspect each user's profile to determine privilege levels assigned. Look for users with roles other than 'superuser' or 'admin'.
    Affected if Any user has less than full administrative privileges, as the vulnerability allows escalation from limited to full admin access.

You are affected if your Citrix ADC, Gateway, NetScaler Gateway, or SD-WAN WANOP version is within the affected ranges AND the management interface is accessible to users with limited privileges.

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-supplied patches: upgrade to Citrix ADC 13.0-64.35+, 12.1-58.15+, 11.1-65.12+ or respective fixed SD-WAN WANOP versions. Restrict management interface access to trusted networks until patched.

Fix this in Application Delivery Controller Firmware Scoped from the published advisory
  • Consultation2.0 h
  • Implementation4.0 h
  • Testing2.0 h
  • Review / QA1.0 h
9.0 hours of engineering $1,600
Get the upgrade done

An estimate, not a bill — we confirm scope with you before any work starts. Need it this week? Rush from $2,560.

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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-2020-8247 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