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Actively exploited in the wild. This CVE is on the CISA Known Exploited Vulnerabilities list — treat remediation as urgent. Federal remediation due by 3 May 2022.
Application Delivery Controller FirmwareOperating system · Citrix

CVE-2020-8195

MEDIUM · 6.5 CVSS v3.1 Published 2020-07-10
Fix available
A fix is available. Upgrade to 1.0.0.137 / 10.2.7 or later.
See remediation →
100/100
Remediation priority · Urgent
In the wild Public exploit 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
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 resulting in limited information disclosure to low privileged users.

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 authenticated low-privileged users to access limited information they should not be able to view. This is an access control bypass via crafted input rather than a direct injection flaw.

MitigationUpgrade Citrix ADC/Gateway to versions 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, 10.2.7 or later. Alternatively, restrict low-privilege user access until patches can be applied.

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
Gateway Plug In For LinuxApplication
Affected:< 1.0.0.137

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
None
Availability
None

CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:N/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 Citrix ADC or Gateway firmware version
    Run 'show version' via NSCLI or check the management GUI under System > Information > Version
    Affected if The 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, or 13.0 to 13.0-58.29
  2. Identify Citrix SDWAN WAN-OP firmware version
    Run 'show system info' via WAN-OP CLI or check the web interface under Administration > System Information
    Affected if The version falls within: 10.2 to 10.2.6, 11.0 to 11.0.3c, or 11.1 to 11.1.1
  3. Identify Citrix Gateway Plug-in for Linux version
    Check the installed package version using 'dpkg -l | grep citrix' or 'rpm -qa | grep citrix' on Linux clients
    Affected if The version is earlier than 1.0.0.137
  4. Verify presence of low-privilege user accounts
    List user accounts via 'show system user' in ADC/Gateway CLI or check Configuration > User Administration > Users in the GUI
    Affected if Any non-administrator user accounts exist in the system
  5. Confirm web management interface exposure
    Check if the Citrix ADC/Gateway management GUI (ports 80/443 or UI) is accessible from untrusted networks or verify the ns.conf for 'set ns mode' configurations
    Affected if The management interface is reachable by authenticated low-privilege users

You are affected if your Citrix ADC, Gateway, or SDWAN WAN-OP firmware version is within the vulnerable ranges listed AND low-privileged user accounts have access to the management interface.

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.

dbcve · scoped
Upgrade available Upgrade to 1.0.0.137 / 10.2.7 / 10.5-70.18 or later
Fixed in 1.0.0.13710.2.710.5-70.18
Interim mitigation

Upgrade Citrix ADC/Gateway to versions 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, 10.2.7 or later. Alternatively, restrict low-privilege user access until patches can be applied.

Recommended fix High confidence

Citrix ADC/Gateway: 10.5-70.18, 11.1-64.14, 12.0-63.21, 12.1-57.18, or 13.0-58.30 (depending on your current branch); SD-WAN: 11.1.1a, 11.0.3d, or 10.2.7; Gateway Plug In For Linux: 1.0.0.137

  1. 1. Identify the exact Citrix product, model, and current firmware version by navigating to the System > Information > Diagnostics section in the management GUI or running 'show version' via CLI
  2. 2. Determine the appropriate target firmware version based on your current branch: for 10.5.x upgrade to 10.5-70.18; for 11.1.x upgrade to 11.1-64.14; for 12.0.x upgrade to 12.0-63.21; for 12.1.x upgrade to 12.1-57.18; for 13.0.x upgrade to 13.0-58.30; for SD-WAN upgrade to 11.1.1a (or 11.0.3d or 10.2.7 as applicable); for Gateway Plug In For Linux upgrade to 1.0.0.137
  3. 3. Create a full configuration backup by navigating to System > Backup and Restore > Create Backup in the GUI or using 'save ns config' via CLI
  4. 4. Review Citrix upgrade documentation and release notes for your specific model to verify compatibility and required pre-upgrade steps
  5. 5. Download the appropriate firmware build from the Citrix support portal (support.citrix.com) - you will need a valid Citrix account
  6. 6. Upload the firmware file through System > Firmware > Upload in the GUI or via SCP/TFTP
  7. 7. Install the firmware by selecting the uploaded build and clicking Install, or via CLI using 'install firmware <build-number>'
  8. 8. Reboot the device when prompted or using 'reboot' command after installation completes
Caveat Review release notes for your specific model before upgrading; some hardware platforms have specific firmware requirements and certain configurations may require adjustment after upgrade

Generated from the published advisory — verify against the referenced sources before acting.

Fix this in Application Delivery Controller Firmware Exploited in the wild — priority engagement
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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-2020-8195 in production — separate from our analysis above.

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What this is

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What belongs here
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  • Version or environment caveats, and links to real fixes
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