NetScaler Times newsletter for Week 27 - 2025
Summary from recent CVEs
Hello Everyone
It’s Andrew with the latest edition of the NetScaler Times, an update to keep you up-to-date on all things NetScaler-related! The idea is to pull together events, firmware releases, support articles, and anything else I think is relevant into a single email, as email is the future!
1. The latest firmware builds.
Below are the details for the various builds, which can help you plan for new releases in your environment. This support document provides additional information on the various release cycles.
NetScaler has multiple form factors to support different environments. It is built on a single operating system with a software-based architecture, so its behaviour will be the same regardless of whether it is used as hardware, a virtual machine, bare metal, or a container. Select one that works for your environment and needs.
Latest Build Versions:
Here is a timeline for the 14.1 and 13.1 builds to show where they are within their respective release lifecycle.
Here are all the firmware builds in a table:
A few build updates last week, mostly related to the security updates for 13.1.
Notes about Builds:
The above is a summary taken from the NetScaler Section here.
For 13.1 FIPS & NDcPP builds: On the downloads page, there are two places to get the 13.1 NDcPP build. The FIPS build is dual-certified now and slightly newer than the NDcPP-only build. It's one to watch if you use those builds.
FIPS FAQ - NetScaler FIPS FAQ - Link
NetScaler 13.1-59.19 release.
Build 13.1-59.19 and later builds address the security vulnerabilities described in https://support.citrix.com/support-home/kbsearch/article?articleNumber=CTX694788.
Support for the CSP header in NetScaler Gateway
The Content Security Policy (CSP) header is now enabled by default in NetScaler Gateway.
Release notes are here
NetScaler Console 13.1-59.19 release.
This console release addresses some fixes. The release notes are here
Which release should I use?
The release families are designed so that 14.1 has more elements changing with each update, hence the feature phase designation. Due to its maintenance phase, 13.1 will have fewer changes now.
An example of the move to 14.1 might be that you want to take advantage of removing the dependency of ALB in Azure with your NetScaler HA deployment. Read more here. This could save some $$$ (insert local currency).
Also, a recent customer request included plans to build a new Azure infrastructure. This was not expected to be a short-term deployment. Looking at the build cycles above, it would make sense to start looking at 14.1 for this. This would avoid re-architecting the solution next year when 13.1 moves to CVE-only support.
What about NetScaler SDX?
There are multiple NetScaler designations. VPX, MPX, SDX, BLX, and CPX all use the same firmware. The table above applies to all NetScaler types. It might not be the same download file, as appliances like the SDX do have other elements to update.
End Of Sale Appliances & End of Life Appliances
The lists below have the recent appliance status changes. These have been revised to be a bit more exhaustive.
EoS Appliances
These appliances are End of Sale (unavailable to buy new now), they will live and run for 5 more years from 2024/2023. Just add 5 years to the EoS date to get the EOL.
EOL Appliances
A table shows the EOL appliance events for the last 18 months. April had a few appliances reach their end of life and must be replaced (to get support). The MPX/SDX 16000 is the replacement in most cases.
I pulled these summary tables from the official site here. Just open and expand the NetScaler section.
2. Latest NetScaler Security updates
On June 25th, the following were issued
1. NetScaler ADC and NetScaler Gateway Security Bulletin for CVE-2025-6543
Full support doc: Link
On June 17th, the following were issued.
2. NetScaler ADC & Gateway Security Bulletin for CVE-2025-5349 & CVE-2025-5777.
Support ref: CTX693420. Status: Critical
Full support doc: Link
3. Citrix Workspace app for Windows Security Bulletin CVE-2025-4879.
Support ref: CTX694718. Status: High
Full support doc: Link
4. NetScaler Console and NetScaler SDX (SVM) Security Bulletin for CVE-2025-4365 –
Support ref: CTXCTX694729. Status: Medium
Full support doc: Link
NetScaler WAF Signatures Update v154 was updated on the 18th June.
New signature rules are generated for the vulnerabilities identified in the week 2025-06-18. You can download and configure these signature rules to protect your appliance from security vulnerable attacks.
Link to details.
3. Updates from around the web.
CVE-2025-6543
3 days ago — A vulnerability has been discovered in NetScaler ADC (formerly Citrix ADC) and NetScaler Gateway (formerly Citrix Gateway). Refer below for further details.
NetScaler Critical Security Updates for CVE-2025-6543 ...
3 days ago — Over the past two weeks, Cloud Software Group has released builds to address CVE-2025-6543 and CVE 2025-5777, which affect NetScaler ADC and NetScaler ...
Getting started with NetScaler - Product Documentation
5 days ago — The NetScaler appliance is an application switch that performs application-specific traffic analysis to intelligently distribute, optimize, and secure Layer 4- ...
4. Feedback for this newsletter
Naturally, if something you feel should be added/removed, or called out, drop me a note at Andrew.Scott@cloud.com. All mistakes are mine 🤭. All opinions expressed in this newsletter are solely my own and do not express the views or opinions of my employer.
You can get all the previous newsletters plus other articles here:
Have a great week!