Can Extended Security Updates Adequately Protect 1 Billion Windows 10 Devices Still in Use?
Can Extended Security Updates Adequately Protect 1 Billion Windows 10 Devices Still in Use?
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Can Extended Security Updates Adequately Protect 1 Billion Windows 10 Devices Still in Use?
Windows 10 reached its End of Support (EOS) on October 14, 2025, leaving over one billion devices worldwide in a precarious security position.
Two months after this critical deadline, the question remains: can Extended Security Updates (ESU) adequately protect the massive number of systems still running this outdated operating system?
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The Scale of the Problem
According to Dell’s November earnings call, the situation is more concerning than many anticipated. Of the approximately 1.5 billion Windows devices operating globally, roughly two-thirds are still running Windows 10 or older operating systems. This breaks down into three critical categories:
- 500 million devices capable of upgrading to Windows 11 but haven’t yet made the transition
- 500 million devices unable to meet Windows 11’s hardware requirements
- The remaining systems already running Windows 11
Dell executives noted that Windows 11 migration is lagging 10-12 percentage points behind previous OS transitions, creating what security experts consider an extremely serious situation from a cybersecurity perspective.
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What ESU Provides—And What It Doesn’t
Microsoft does offer Extended Security Updates for organizations that cannot immediately migrate from Windows 10.
Through separate ESU contracts, organizations can continue receiving security updates for Critical and Important vulnerabilities.
However, this stopgap measure has significant limitations that leave systems vulnerable to emerging attack methods.
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The Growing BYOVD Threat
One particularly concerning vulnerability affects Windows 10 systems without ESU coverage: BYOVD (Bring Your Own Vulnerable Driver) attacks. This technique exploits legitimate but vulnerable signed drivers to compromise systems, and has been used by sophisticated ransomware groups including Qilin, which targeted a major Japanese beverage manufacturer.
The attack works by leveraging old drivers with known vulnerabilities to disable security tools like Endpoint Detection and Response (EDR) systems. While modern operating systems require digital signatures for drivers, older signed drivers may still contain exploitable vulnerabilities.
Microsoft provides a blocklist of vulnerable drivers, which is enabled by default in Windows 11 systems from the 2022 update forward. However, this protection is notably absent from Windows 10 systems without ESU contracts, making them attractive targets for attackers who understand these weaknesses.
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Why ESU Falls Short
Extended Security Updates, while better than nothing, cannot provide comprehensive protection for several reasons:
Limited Scope: ESU only covers Critical and Important security updates—it doesn’t include the vulnerable driver blocklist or other advanced security features built into Windows 11.
No Feature Updates: Organizations running Windows 10 with ESU miss out on security architecture improvements and new defensive capabilities introduced in Windows 11.
Temporary Solution: ESU is designed as a bridge to migration, not a permanent security strategy. The protection gap will only widen as attackers develop new techniques specifically targeting legacy systems.
Third-Party Software: ESU only covers the operating system itself. Many third-party applications are reaching their own end of support for Windows 10, creating additional security gaps.
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The Migration Challenge
The devices unable to meet Windows 11’s hardware requirements present the most difficult challenge. These systems face the highest risk from BYOVD attacks and other exploits, yet cannot be protected through simple software updates.
Organizations face several common barriers to migration:
- Budget constraints: Replacing 500 million incompatible devices represents an enormous capital expenditure
- Resource limitations: IT departments lack sufficient staff to manage large-scale migrations
- Legacy system compatibility: Critical business applications may not function on Windows 11
Recommended Security Measures
For organizations unable to immediately migrate all systems, security experts recommend a multi-layered approach:
Prioritize vulnerable systems: Devices that cannot upgrade to Windows 11 should be replaced or isolated first, as they face the highest risk from BYOVD attacks.
Network-level protection: Implement OS-independent security measures such as DNS-level blocking of malicious sites. These protections work across all devices, including IoT equipment like printers and security cameras.
Shadow IT discovery: Use network traffic analysis tools to identify Windows 10 devices that may be operating without IT department knowledge.
Third-party software audits: Organizations using ESU should inventory all third-party software to determine when those products will reach end of support on Windows 10.
Executive-level resource allocation: Identify specific bottlenecks—whether budget, staffing, or compatibility issues—and make strategic decisions about resource deployment at the leadership level.
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The Verdict
While Extended Security Updates provide some protection, they cannot adequately secure one billion Windows 10 devices against the full spectrum of modern threats. ESU is best understood as a temporary lifeline, not a comprehensive security solution.
The vulnerable driver blocklist absence alone creates a significant attack surface that ESU does not address. Combined with the eventual end of support for third-party applications and the continuing evolution of attack techniques, organizations relying on ESU are accepting considerable risk.
The harsh reality is that true security requires migration to Windows 11 or replacement with compatible hardware. For the 500 million devices capable of upgrading, the question is not whether to migrate, but how quickly it can be accomplished. For the 500 million incompatible devices, organizations must make difficult decisions about replacement timelines and interim risk management.
Two months after Windows 10’s EOS, the world faces a massive cybersecurity challenge. Extended Security Updates may buy time, but they cannot eliminate the fundamental vulnerabilities of running outdated operating systems at such scale.
