That security bulletin only included fixes for Windows Vista, Windows 7, Windows 8.1, Windows 10, Windows Server 2008, Windows Server 2012, and Windows Server 2016. Old Windows PCs can stop WannaCry ransomware with new Microsoft patch. Users of old Windows systems can now download a patch to protect them from this week’s massive ransomware attack. Here is how to apply the Windows update you need to patch the EternalBlue exploit used by WannaCry and Uiwix ransomware. How to Apply the Windows Update that Patches the EternalBlue SMB Exploit Here’s the step by step guide you need to get it done right now. For windows 8.1 only a win32 patch and amd64 patch exist, right?

Today, Microsoft has released an update KB4012598 for Windows devices to fix WannaCry ransomware. The new update is now available for Windows XP, Windows 8 and Windows Server 2003. Previously, the company had released WannaCry ransomware patch for Windows 10 devices in Match.

Official Microsoft Post,

Today many of our customers around the world and the critical systems they depend on were victims of malicious “WannaCrypt” software. Seeing businesses and individuals affected by cyberattacks, such as the ones reported today, was painful. Microsoft worked throughout the day to ensure we understood the attack and were taking all possible actions to protect our customers. This blog spells out the steps every individual and business should take to stay protected. Additionally, we are taking the highly unusual step of providing a security update for all customers to protect Windows platforms that are in custom support only, including Windows XP, Windows 8, and Windows Server 2003. Customers running Windows 10 were not targeted by the attack today.

We also know that some of our customers are running versions of Windows that no longer receive mainstream support. That means those customers will not have received the above mentioned Security Update released in March. Given the potential impact to customers and their businesses, we made the decision to make the Security Update for platforms in custom support only, Windows XP, Windows 8, and Windows Server 2003, broadly available for download

If you are affected by WannaCry ransomware, just select your operating system and download WannaCry ransomware fix update KB4012598 from the link below.

Windows Server 2003 SP2 x64

Windows Server 2003 SP2 x86

Windows XP SP2 x64

Windows XP SP3 x86

Windows XP Embedded SP3 x86

Windows 8 x86

Wanna Cry Patch Download

Windows 8 x64

Windows 8.1 Wannacry Patch Download

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