Long Live Windows 10... With 0patch

End of Windows 10 Support Looming? Don't Worry, 0patch Will Keep You Secure For Years To Come!

 

October 2025 will be a bad month for many Windows users. That's when Windows 10 will receive their last free security update from Microsoft, and the only "free" way to keep Windows using securely will be to upgrade to Windows 11.

Now, many of us don't want to, or simply can't, upgrade to Windows 11.

We don't want to because we got used to Windows 10 user interface and we have no desire to search where some button has been moved to and why the app that we were using every day is no longer there, while the system we have is already doing everything we need.

We don't want to because of increasing enshittification including bloatware, Start Menu ads, and serious privacy issues. We don't want to have an automated integrated screenshot- and key-logging feature constantly recording our activity on the computer.

We may have applications that don't work on Windows 11.

We may have medical devices, manufacturing devices, POS terminals, special-purpose devices, ATMs that run on Windows 10 and can't be easily upgraded.

And finally, our hardware may not even qualify for an upgrade to Windows 11: Canalys estimates that 240 million computers worldwide are incompatible with Windows 11 hardware requirements, lacking Trusted Platform Module (TPM) 2.0, supported CPU, 4GB RAM, UEFI firmware with Secure Boot capability, or supported GPU.

 

What's going to happen in October 2025?

Nothing spectacular, really. Windows 10 computers will receive their last free updates and will, without some additional activity, start a slow decline into an increasingly vulnerable state as new vulnerabilities are discovered, published and exploited that remain indefinitely present on these computers. The risk of compromise will slowly grow in time, and the amount of luck required to remain unharmed will grow accordingly.

The same thing happened to Windows 7 in January 2020; today, a Windows 7 machine last updated in 2020 with no additional security patches would be really easy to compromise, as over 70 publicly known critical vulnerabilities affecting Windows 7 have been discovered since.

Leaving a Windows 10 computer unpatched after October 2025 will likely open it up to the first critical vulnerability within the first month, and to more and more in the following months. If you plan to do this, at least make sure to make the computer hard to access physically and via network.

For everyone else, there are two options to keep Windows 10 running securely.

Option 1: Extended Security Updates

If you qualify, Microsoft will happily sell you Extended Security Updates (ESU) , which means another year, two or even three of security fixes for Windows 10 - just like they have done before with Windows 7, Server 2008 and Server 2012.

At this moment, pricing for ESU is only known for commercial and educational organizations, while consumer pricing will be revealed at a later time. Educational organizations will have it cheap - just $7 for three years -, while commercial organizations are looking at spending some serious money: $61 for the first year, $122 for the second year and $244 for the third year of security updates, totaling in $427 for every Windows 10 computer in three years.

Opting for Extended Security Updates will keep you on the familiar monthly "update + reboot" cycle and it will only cost you $4 million if you have 10k computers in your network.

If only there was a way to get more for less...

Option 2: 0patch

With October 2025, 0patch will "security-adopt" Windows 10 v22H2, and provide critical security patches for it for at least 5 more years - even longer if there's demand on the market.

We're the only provider of unofficial security patches for Windows ("virtual patches" are not really patches), and we have done this many times before: after security-adopting Windows 7 and Windows Server 2008 in January 2020, we took care of 6 versions of Windows 10 as their official support ended, security-adopted Windows 11 v21H2 to keep users who got stuck there secure, took care of Windows Server 2012 in October 2023 and adopted two popular Office versions - 2010 and 2013 - when they got abandoned by Microsoft. We're still providing security patches for all of these.

With 0patch, you will be receiving security "micropatches" for critical, likely-to-be-exploited vulnerabilities that get discovered after October 14, 2025. These patches will be really small, typically just a couple of CPU instructions (hence the name), and will get applied to running processes in memory without modifying a single byte of original Microsoft's binary files. (See how 0patch works.)

There will be no rebooting the computer after a patch is downloaded, because applying the patch in memory can be done by briefly stopping the application, patching it, and then letting it continue. Users won't even notice that their computer was patched while they were writing a document, just like servers with 0patch get patched without any downtime at all.

Just as easily and quickly, our micropatches can be un-applied if they're suspected of causing problems. Again, no rebooting or application re-launching.

 

0patch also brings "0day", "Wontfix" and non-Microsoft security patches

But with 0patch, you won't only get patches for known vulnerabilities that are getting patched on still-supported Windows versions. You will also get:

1. "0day" patches - patches for vulnerabilities that have become known, and are possibly already exploited, but for which no official vendor patches are available yet. We've fixed many such 0days in the past, for example "Follina" (13 days before Microsoft), "DogWalk" (63 days before Microsoft), Microsoft Access Forced Authentication (66 days before Microsoft) and "EventLogCrasher" (100+ days before Microsoft). On average, our 0day patches become available 49 days before official vendor patches for the same vulnerability do.
   
   
2. "Wontfix" patches - patches for vulnerabilities that the vendor has decided not to fix for some reason. The majority of these patches currently fall into the "NTLM coerced authentication" category: NTLM protocol is more prone to abuse than Kerberos and Microsoft has decided that any security issues related to NTLM should be fixed by organizations abandoning their use of NTLM. Microsoft therefore doesn't patch these types of vulnerabilities, but many Windows networks can't just give up on NTLM for various reasons, and our "Wontfix" patches are there to prevent known attacks in this category. At this time, our "Wontfix" patches are available for the following known NTLM coerced authentication vulnerabilities: DFSCoerce, PrinterBug/SpoolSample and PetitPotam.
   
   
3. Non-Microsoft patches - while most of our patches are for Microsoft's code, occasionally a vulnerability in a non-Microsoft product also needs to be patched when some vulnerable version is widely used, or the vendor doesn't produce a patch in a timely manner. Patched products include Java runtime, Adobe Reader, Foxit Reader, 7-Zip, WinRAR, Zoom for Windows, Dropbox app, and NitroPDF.

While you're probably reading this article because you're interested in keeping Windows 10 secure, you should know that the above patches are also available for supported Windows versions such as Windows 11 and Windows Server 2022, and we keep updating them as needed. Currently, about 40% of our customers are using 0patch on supported Windows versions as an additional layer of defense or for preventing known NTLM attacks that Microsoft doesn't have patches for.

How about the cost? Our Windows 10 patches will be included in two paid plans:

1. 0patch PRO: suitable for small businesses and individuals, management on the computer only, single administrator account - currently priced at 24.95 EUR + tax per computer for a yearly subscription.
2. 0patch Enterprise: suitable for medium and large organizations, includes central management, multiple users and roles, computer groups and group-based patching policies, single sign-on etc. - currently priced at 34.95 EUR + tax per computer for a yearly subscription.

The prices may get adjusted in the future but if/when that happens anyone having an active subscription on current prices will be able to keep these prices on existing subscriptions for two more years. (Another reason to subscribe sooner rather than later.)

How to Prepare for October 2025

 

Organizations

Organizations need time to asses, test, purchase and deploy a new technology so it's best to get started as soon as possible. We recommend the following approach:

1. Read our Help Center articles to familiarize yourself with 0patch.
   
2. Create a free 0patch account at https://central.0patch.com.
   
3. Ask for a free Enterprise trial by emailing sales@0patch.com. (Trials will soon be available directly from 0patch Central.)
   
4. Install 0patch Agent on some testing computers, ideally with other typical software you're using, especially security software.
5. Familiarize yourself with 0patch Central.
6. See how 0patch works with your apps, report any issues to support@0patch.com.
   
7. Deploy 0patch Agent on all Windows 10 machines.
8. Purchase licenses.
   
9. In October 2025, apply the last Windows Updates.
   
10. Let 0patch take over Windows 10 patching.

 

Home Users and Small Businesses

Home users and small businesses who want to keep using Windows 10 but don't need enterprise features like central management, patching policies and users with different roles, should do the following:

1. Read our Help Center articles to familiarize yourself with 0patch.
   
2. Create a free 0patch account at https://central.0patch.com.
   
3. Ask for a free PRO trial by emailing sales@0patch.com. (Trials will soon be available directly from 0patch Central.)
   
4. Install 0patch Agent on your computer(s).
5. See how 0patch works with your apps, report any issues to support@0patch.com.
   
6. Purchase licenses.
   
7. In October 2025, apply the last Windows Updates.
   
8. Let 0patch take over Windows 10 patching.

 

Distributors, Resellers, Managed Service Providers

We have a large and growing network of partners providing 0patch to their customers. To join, send an email to sales@0patch.com and tell us whether you're a distributor, reseller or MSP, and we'll have you set up in no time.

We recommend you find out which of your customers may be affected by Windows 10 end-of-support, and let them know about 0patch so they have time to assess it.

Suppliers of Refurbished Windows 10 Computers

A lot of used PCs get refurbished and find a new owner for a more affordable price compared to a new PC. Both suppliers and buyers of such refurbished PCs can count on 0patch to provide critical security patches for Windows 10 v22H2 for at least 5 years after October 2025.

Suppliers of refurbished Windows 10 PCs should make sure to install Windows 10 v22H2 and set up automatic Windows Updates such that updates will be installed as long as they are available. They should also let the buyers know about 0patch and provide them with the following instructions:

1. Create a free 0patch account at https://central.0patch.com.
   
2. Install 0patch Agent on your computer(s) and keep using 0patch FREE.
3. See how 0patch works with your apps, report any issues to support@0patch.com.
   
4. In October 2025, apply the last Windows Updates.
5. Purchase a 0patch license.
6. Let 0patch take over Windows 10 patching.

Frequently Asked Questions

Q: How long do you plan to provide security patches for Windows 10 after October 2025?

A: We initially plan to provide security patches for 5 years, but will extend that period if there is sufficient demand. (We're now in year 5 of Windows 7 support and will extend it further.)

Q: How much will it cost to use 0patch on Windows 10?

A: Our current yearly price for 0patch PRO is 24.95 EUR + tax per computer, and for 0patch Enterprise 34.95 EUR + tax per computer. Active subscriptions will keep these prices for two more years in case of pricing changes.

Q: What is the difference between 0patch PRO and 0patch Enterprise?

A:  While both plans include all security patches, 0patch Enterprise also includes central management via 0patch Central, multiple users and roles, computer groups and group-based patching policies, single sign-on and various other enterprise functions.

Q: What is 0patch FREE?

A: 0patch FREE is a free 0patch plan that only includes "0day patches", i.e., patches for vulnerabilities that don't have an official vendor fix available (yet). 0patch FREE does not include security patches needed for keeping Windows 10 secure after October 2025. Please see this article for more information on restrictions regarding 0patch FREE.

Q: Does 0patch also provide general technical support for Windows 10?

A: No. We only provide security patches and support related to using this service.

Q: Where can I learn more about 0patch?

A: Our Help Center has many answers for you.

Micropatches For Microsoft Outlook Remote Code Execution Vulnerability (CVE-2024-21378)

 

In February 2024, Microsoft released a patch for CVE-2024-21378, a vulnerability in Microsoft Outlook that allowed an attacker to execute arbitrary code on user's computer when the user opened a malicious email. The vulnerability was reported by Nick Landers with NetSPI.

A month later, NetSPI published an analysis that detailed this vulnerability and provided a proof-of-concept to demonstrate how an attacker could exploit an Exchange server to achieve arbitrary code execution.

 

The Vulnerability

The vulnerability affects Outlook custom forms. These forms provide advanced users with a way to modify existing form templates (email, appointment, note, etc.) or create new ones from scratch.

Long story short, a malicious Outlook form could be installed on an Exchange server and automatically downloaded to user's Outlook by a carefully crafted email message. Upon downloading, the malicious form would register a DLL downloaded with the form as an in-process server to achieve its automatic execution. While Outlook developers were apparently aware of this trick and implemented a security check to prevent Outlook forms from creating a new relative InprocServer32 registry path, NetSPI researchers were able to bypass it by providing an absolute path instead.

NetSPI also added support for this vulnerability to SensePost's tool Ruler. If the attacker was able to capture user's Device Code authentication token, they could remotely authenticate to an Exchange server and upload their custom form with executable/DLL. Outlook automatically syncs with the Exchange server, and all the attacker would need to do to trigger the exploit was to send the user an mail with the malicious form. When the user opened such email, the vulnerability would get triggered and attacker's code started executing in user's Outlook.exe process.

 

Microsoft's Patch

Microsoft patched this issue by removing the branch of code that parses and processes absolute registry paths, so it's no longer possible to bypass the deny-list that blocks InprocServer32 and other similar keywords.

 

Our Patch

While Microsoft provided an official patch for supported Office versions, many users are still running Office 2010 and 2013, which we had security-adopted. We confirmed that this issue also affect both these Office versions, and therefore created a patch for them.

Our patch is in logically identical to Microsoft's, bypassing the vulnerable code using a single JMP instruction.

The following video demonstrates our patch with Outlook 2013. Initially, 0patch is disabled and attacker's malicious email is already waiting in user's inbox to be opened. As soon as the user clicks on the email, attacker's code gets executed. In contrast, with 0patch enabled, opening the malicious email results in an error message, and attacker's code does not get executed.

 

 

Micropatch Availability

Micropatches were written for the following versions of Microsoft Office with all available updates installed:

1. Office 2010 (PRO or Enterprise license required)
   
2. Office 2013 (PRO or Enterprise license required)

 

 

Micropatches have already been distributed to, and applied on all computers with registered and licensed 0patch Agents, unless Enterprise group settings prevent that. 

Vulnerabilities like this one get discovered on a regular basis, and attackers know about them all. If you're using Windows that aren't receiving official security updates anymore, 0patch will make sure these vulnerabilities won't be exploited on your computers - and you won't even have to know or care about these things.

If you're new to 0patch, create a free account in 0patch Central, then install and register 0patch Agent from 0patch.com, and email sales@0patch.com for a trial. Everything else will happen automatically. No computer reboot will be needed.

We would like to thank Nick Landers and Rich Wolferd with NetSPI for sharing details and proof-of-concept, which made it possible for us to create a micropatch for this issue.

To learn more about 0patch, please visit our Help Center.