Experts in embedded RTOS, with a specialisation in safety certified software

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WITTENSTEIN high integrity systems

WITTENSTEIN high integrity systems: experts in embedded RTOS and Middleware technology with a specialisation in safety certified software. Supplying advanced RTOS and Middleware components across a broad range of market sectors and applications, from basic embedded designs, up to complex safety systems demanding the highest levels of certification. Contact us today.

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Security flaws were highlighted by Zimperium that affect the Amazon FreeRTOS TCP/IP Stack. These flaws only relate to Amazon FreeRTOS TCP/IP. It does not affect the SAFERTOS/ OPENRTOS kernel code.

All WHIS customers that have been affected by this issue have been informed. They have either received an update, or will do in the very near future.

As part of our strategic business alliance with Amazon Web Services (AWS), WHIS offers commercial licenses for Amazon FreeRTOS, including their TCP/IP stack. AWS have released a later version of the TCP/IP stack which addresses the items mentioned in this report. This later version of the TCP/IP Stack is now being distributed by WHIS under a commercial license.

We very much appreciate the work undertaken by Zimperium, and the advance notice they provided allowing us to inform our customer base before the release of this article.


Add greater safety and security to your SAFERTOS applications with these safety plugins, supplied with a certification pack to IEC 61508.


Fast, feature rich Middleware solutions available tightly integrated with our RTOS products.

RTOS Specialists

WITTENSTEIN high integrity systems use an ISO 9001:2015 Quality Management System, certified by Lloyds Register LRQA UK applicable to:

Design, development, installation and support of high integrity systems and software for medical, aviation and industrial applications.

Our team of development engineers are here to help resolve any questions you might have about our products. First year support included free as standard.

Become a competent and informed user of our RTOS and middleware components by attending  one of our training courses. More…

Benefit from our knowledge and experience to help optimise designs, improve your design processes and achieve certification faster. More…

Latest News

ARM TechCon

We’re exhibiting at booth 920 this year at ARM TechCon. We’ll be showcasing SAFERTOS and have all sorts of giveaways, so come and stop by to discuss your requirements.


ST Developers Conference

We’re at ST’s Developers conference again this year. This year we’ll be showcasing SAFERTOS integrated with ST’s Functional Safety Design Package. Read our white paper on it here.



Our Partners

Below are some of our partners. View our partners page to see the full list.

Texas InstrumentsRenesas Gold PartnerARMPremier Microchip Third Party PartnerXilinx alliance program memberMicrosemiST LogoNXPIAR logo