NetScaler ADC and NetScaler Gateway Security Bulletin for CVE-2025-12101

by admin | Nov 12, 2025 | ALARM, ctx_adc, ctx_workspace

Attention! Please note the following regarding to this update:

Netscaler customers who are not yet using Flex licensing (CITRIX HMC) or Fixed Term licenses must download the installed license file again from the www.citrix.com portal (License) with the correct MAC address and replace it on the Netscaler. These newly created license files will then only be valid until April 2026. If the file is not replaced, the Netscaler will start up with a freemium license after a reboot!
AXACOM AG recommends installing this patch (medium with a score of 5.9) only when the Netscaler can be converted to the new LAS licensing.

License Activation Service

Important:

File-based licensing system (also referred to as manually managed entitlements), traditionally used for activating various on-premises components, will be End of Life (EOL) on April 15, 2026. License Activation Service (LAS) is the next generation technology for product activations across the suite of Citrix products. LAS will be the only way to activate and license NetScaler instances after April 15, 2026, supporting NetScaler Flexed licenses (CPL/UHMC), legacy NetScaler Pooled licenses, and NetScaler Fixed term Bandwidth licenses. To remain supported, your NetScaler and NetScaler Console deployments must be on a LAS compatible version.

The minimum required NetScaler^® versions that are LAS compatible are:

• NetScaler ADCs: 14.1-51.80, 13.1-60.29, 13.1-37.247 (FIPS)
• NetScaler SVM: 14.1-51.83, 13.1-60.30
• NetScaler Console Service: Supported from early September 2025
• NetScaler Console on-prem: 14.1-51.83Note: LAS support for Console on-prem is from release 14.1-51.83 onwards. However, file-based licensing is deprecated from Console on-prem releases 14.1-51.83 onwards and 13.1-60.26 onwards, and goes EOL on April 15th, 2026. That is, even if you upgrade to Console on-prem release 14.1-51.83 or release 13.1-60.26 or later, you can continue using file-based licensing. However you must upgrade to Console on-prem release 14.1-51.83 or later, and switch to LAS before 15th April 2026 because file-based licensing reaches EOL.

All the other forms of legacy NetScaler licenses such as Pooled vCPU, CICO, perpetual will not be supported with LAS. NetScaler instances leveraging perpetual licenses without an active maintenance will become unlicensed upon upgrade to the above mentioned software versions.

LAS based licenses may not be available to customers where prohibited by law or regulations.

If you have questions or concerns, contact Customer Care. Citrix^® may limit or suspend your Citrix Maintenance for non-compliance with these requirements without liability in addition to any other remedies Citrix may have at law or equity. These requirements don’t apply where prohibited by law or regulation.

License Activation Service | NetScaler 14.1

Article Id : CTX695486

Last Modified Date : 11-11-2025 12:40

Created Date : 11-11-2025 10:19

Article Record Type : Security BulletinSeverity :

 Medium

Summary

Severity – Medium

Description of Problem

A vulnerability has been discovered in NetScaler ADC (formerly Citrix ADC) and NetScaler Gateway (formerly Citrix Gateway). Refer below for further details.

Affected Versions

The following supported versions of NetScaler ADC and NetScaler Gateway are affected by the vulnerabilities: 

• NetScaler ADC and NetScaler Gateway 14.1 BEFORE 14.1-56.73
• NetScaler ADC and NetScaler Gateway 13.1 BEFORE 13.1-60.32
• NetScaler ADC 13.1-FIPS and NDcPP BEFORE 13.1-37.250-FIPS and NDcPP
• NetScaler ADC 12.1-FIPS and NDcPP BEFORE 12.1-55.333-FIPS and NDcPP

Note: NetScaler ADC and NetScaler Gateway versions 12.1 and 13.0 are now End Of Life (EOL) and are vulnerable. Customers are recommended to upgrade their appliances to one of the supported versions that address the vulnerabilities. 

Additional Note: Secure Private Access on-prem or Secure Private Access Hybrid deployments using NetScaler instances are also affected by the vulnerabilities. Customers need to upgrade these NetScaler instances to the recommended NetScaler builds to address the vulnerabilities. 

This bulletin only applies to customer-managed NetScaler ADC and NetScaler Gateway. Cloud Software Group upgrades the Citrix-managed cloud services and Citrix-managed Adaptive Authentication with the necessary software updates.

Disclaimer

The information on this page is being provided to you on an «AS IS» and «AS-AVAILABLE» basis. The issues described on this page may or may not impact your system(s). Cloud Software Group, Inc. and its subsidiaries (collectively, «Cloud SG») make no representations, warranties, or guarantees as to the information contained herein. ANY AND ALL WARRANTIES, EXPRESS OR IMPLIED, INCLUDING, WITHOUT LIMITATION, INCLUDING, BUT NOT LIMITED TO, IMPLIED WARRANTIES OF MERCHANTABILITY, NON-INFRINGEMENT AND FITNESS FOR A PARTICULAR PURPOSE ARE HEREBY DISCLAIMED. BY ACCESSING THIS PAGE, YOU ACKNOWLEDGE THAT CLOUD SG SHALL IN NO EVENT BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, PUNITIVE, OR CONSEQUENTIAL DAMAGES THAT ARISE OUT OF YOUR USE OR FAILURE TO USE THE INFORMATION CONTAINED HEREIN. Cloud SG reserves the right to change or update the information on this page at any time. We accordingly recommend that you always view the latest version of this page. The information contained herein is being provided to you under the terms of your applicable customer agreement with Cloud SG, and may be used only for the purposes contemplated by such agreement. If you do not have such an agreement with Cloud SG, this information is provided under the cloud.com Terms of Use, and may be used only for the purposes contemplated by such Terms of Use.

Details

NetScaler ADC and NetScaler Gateway are affected by the vulnerability mentioned below:

What Customers Should Do

Cloud Software Group strongly urges affected customers of NetScaler ADC and NetScaler Gateway to install the relevant updated versions as soon as possible. 

• NetScaler ADC and NetScaler Gateway 14.1-56.73 and later releases
• NetScaler ADC and NetScaler Gateway 13.1-60.32 and later releases of 13.1
• NetScaler ADC 13.1-FIPS and 13.1-NDcPP 13.1-37.250 and later releases of 13.1-FIPS and 13.1-NDcPP
• NetScaler ADC 12.1-FIPS and 12.1-NDcPP 12.1-55.333 and later releases of 12.1-FIPS and 12.1-NDcPP

Note: NetScaler ADC and NetScaler Gateway versions 12.1 and 13.0 are now End Of Life (EOL) and no longer supported. Customers are recommended to upgrade their appliances to one of the supported versions that address the vulnerabilities. 

CVE-2025-12101 : 

Customers can determine if they have an appliance configured as one of the following by inspecting their NetScaler Configuration for the specified strings

• An Auth Server (AAA Vserver):
  add authentication vserver .*
• A Gateway (VPN Vserver,  ICA Proxy, CVPN, RDP Proxy) :
  add vpn vserver .*