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Application Delivery Controller FirmwareOperating system · Citrix

CVE-2020-8191

MEDIUM · 6.1 CVSS v3.1 Published 2020-07-10
Fix available
A fix is available. Upgrade to 10.2.7 / 10.5-70.18 or later.
See remediation →
68/100
Remediation priority · Elevated
Remotely reachable No privileges

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
Improper input validation in Citrix ADC and Citrix Gateway versions before 13.0-58.30, 12.1-57.18, 12.0-63.21, 11.1-64.14 and 10.5-70.18 and Citrix SDWAN WAN-OP versions before 11.1.1a, 11.0.3d and 10.2.7 allows reflected Cross Site Scripting (XSS).

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

Improper input validation in Citrix ADC and Citrix Gateway (and SDWAN WAN-OP) allows reflected Cross Site Scripting (XSS). The vulnerability stems from unsanitized user input being reflected back in web responses without proper encoding, enabling attackers to inject malicious scripts into legitimate web pages.

MitigationUpgrade Citrix ADC/Gateway to version 13.0-58.30, 12.1-57.18, 12.0-63.21, 11.1-64.14, or 10.5-70.18 (or later); upgrade SDWAN WAN-OP to 11.1.1a, 11.0.3d, or 10.2.7 (or later). Implement WAF rules as interim control if immediate upgrade is not feasible.

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:>= 10.5, < 10.5-70.18>= 11.1, < 11.1-64.14>= 12.0, < 12.0-63.21>= 12.1, < 12.1-57.18>= 13.0, < 13.0-58.30
Netscaler Gateway FirmwareOperating system
Affected:>= 10.5, < 10.5-70.18>= 11.1, < 11.1-64.14>= 12.0, < 12.0-63.21>= 12.1, < 12.1-57.18
Gateway FirmwareOperating system
Affected:>= 13.0, < 13.0-58.30
Sd Wan WanopOperating system
Affected:>= 10.2, < 10.2.7>= 11.0, < 11.0.3d>= 11.1, < 11.1.1a

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
Required
Scope
Changed
Confidentiality
Low
Integrity
Low
Availability
None

CVSS:3.1/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 checks

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

  1. Identify the Citrix ADC firmware version
    Access the command line interface and run 'show version' or log into the web UI and check System > Information > Version. For CLI: `show ns version`
    Affected if The installed version falls within any of these ranges: 10.5 to 10.5-70.17, 11.1 to 11.1-64.13, 12.0 to 12.0-63.20, 12.1 to 12.1-57.17, 13.0 to 13.0-58.29
  2. Identify the Citrix Netscaler Gateway firmware version
    Run `show version` at the command prompt or check the web UI under Configuration > System > Information
    Affected if The installed version falls within any of these ranges: 10.5 to 10.5-70.17, 11.1 to 11.1-64.13, 12.0 to 12.0-63.20, 12.1 to 12.1-57.17
  3. Identify the Citrix Gateway Firmware version
    Run `show version` or access the web interface and navigate to the firmware version information page
    Affected if The installed version is between 13.0 and 13.0-58.29 (inclusive)
  4. Identify the Citrix SDWAN WAN-OP firmware version
    Access the SDWAN web UI or use the CLI command to display the firmware version, typically found under Administration > Device Settings
    Affected if The installed version falls within any of these ranges: 10.2 to 10.2.6, 11.0 to 11.0.3c, 11.1 to 11.1.1
  5. Verify the web management interface is accessible
    Attempt to reach the Citrix ADC/Gateway login page over HTTPS on port 443 or the configured management port. Check if the NSGUI or VPN virtual server is enabled and bound
    Affected if The web interface is exposed and the device is on an affected version - the XSS flaw requires the web UI to be reachable for exploitation

If any Citrix ADC, Netscaler Gateway, Citrix Gateway, or SDWAN WAN-OP installation is running a version lower than the fixed releases (10.5-70.18, 11.1-64.14, 12.0-63.21, 12.1-57.18, 13.0-58.30, or 11.1.1a for SDWAN) and has its web management interface exposed, the environment is affected by this reflected XSS vulnerability.

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 10.2.7 / 10.5-70.18 / 11.0.3d or later
Fixed in 10.2.710.5-70.1811.0.3d
Interim mitigation

Upgrade Citrix ADC/Gateway to version 13.0-58.30, 12.1-57.18, 12.0-63.21, 11.1-64.14, or 10.5-70.18 (or later); upgrade SDWAN WAN-OP to 11.1.1a, 11.0.3d, or 10.2.7 (or later). Implement WAF rules as interim control if immediate upgrade is not feasible.

Fix this in Application Delivery Controller Firmware Scoped from the published advisory
  • Consultation4.0 h
  • Implementation6.0 h
  • Testing4.0 h
  • Review / QA2.0 h
16.0 hours of engineering $2,840
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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-2020-8191 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