"Display screens and monitors are everywhere in modern business environments, and the SilentGlass device will help protect previously vulnerable IT infrastructure with unprecedented ease," said Ollie Whitehouse, CTO at NCSC.
SilentGlass: a plug-and-play shield for HDMI and DisplayPort
On April 22 the UK National Cyber Security Centre (NCSC) unveiled SilentGlass, a hardware device described as plug-and-play and designed to "actively block anything unexpected or malicious between HDMI or display port connections and monitor screens." The launch took place at CYBERUK, the UK government’s flagship annual cybersecurity conference. The NCSC says SilentGlass is approved for use in "even the most high-threat cybersecurity environments."
Why monitors are being targeted — and what SilentGlass addresses
The NCSC framed the problem plainly: monitors are attractive targets for malicious threat actors because of the role screens play in holding and processing "valuable, sensitive or personal data." The agency warned that attackers could abuse access to monitors to "infiltrate networks for malicious activities such as disruption or financial gain," exploiting a perceived lack of mitigations around video interfaces. SilentGlass, the NCSC said, was developed to "help to shut down this attack vector" by interposing between video output and the screen.
NCSC, Goldilock Labs and Sony UK: manufacturing, licensing and commercialization
The NCSC announced a partnership with Goldilock Labs and Sony UK to manufacture and sell SilentGlass globally. Goldilock Labs, described by the NCSC as a UK-based small business and "experts in cyber security innovation," was awarded the contract license to manufacture SilentGlass after what the NCSC called "a competitive process." Stephen Kines, co-founder of Goldilock Labs, said SilentGlass "addresses a gap that has been widely overlooked" and noted that hardware interfaces have rarely been treated as security boundaries despite exposure through supply chains, third-party servicing and direct physical access.
Deployment and approvals: government estates and high-threat environments
The NCSC stated that SilentGlass has "already been successfully deployed on government estates" and has now been released for general purchase. The agency and its partners said they expect "rapid global adoption of SilentGlass by governments and risk-conscious organizations," and the NCSC highlighted the device as an example of government intellectual property being commercialized to support national prosperity.
How technologists, procurement teams, and CNI and businesses should respond
- Technologists and security teams: SilentGlass presents a targeted mitigation for the video-connection attack vector the NCSC described. Teams responsible for endpoint hardening and physical security will need to evaluate where HDMI and DisplayPort links form part of an organization's threat surface and whether approved, plug-and-play devices are appropriate to deploy.
- Governments and procurement leaders: The NCSC's licensing of manufacturing to Goldilock Labs after a "competitive process," and the device's prior use on government estates, signals a procurement pathway from government development to commercial supply. Procurement leaders tasked with high-threat environments will likely weigh an approved product that the NCSC has certified for those settings.
- Critical national infrastructure (CNI) and businesses: Goldilock Labs and the NCSC positioned SilentGlass as a "low-cost, easy to deploy solution for CNI and businesses where the same risks exist." Operators of systems that display sensitive or personal data will be asked to consider whether adding a hardware interposer aligns with their risk models.
Commercial rollout, CYBERUK context, and next visible steps
The launch at CYBERUK 26 — the conference's 10th year, hosted in Glasgow, Scotland — was framed by broader warnings from the NCSC leadership about risk. Richard Horne, CEO of the NCSC, opened the conference by warning that a "perfect storm" of new technologies and geopolitical risks have created the risk of unprecedented cyber threats for the UK. Against that backdrop, the NCSC, Goldilock Labs and Sony UK have positioned SilentGlass as both a defensive tool and a commercial product expected to be offered globally.
Conclusion
SilentGlass is presented by the NCSC as a narrowly scoped, hardware-focused mitigation for risks tied to video interfaces — a product that has already been used on government estates, is approved for high-threat environments, and is now available for purchase through a commercial partnership with Goldilock Labs and Sony UK. The NCSC frames the device as an example of moving government-developed IP into the market; its real-world uptake will be a test of whether a single-purpose, plug-and-play device convinces governments and risk-conscious organizations to treat video ports as the security boundary the agency says they have too often been left as.
