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Risks of Skipping Windows Updates: Vulnerabilities Exploited by Attackers

Risks of Skipping Windows Updates: Vulnerabilities Exploited by Attackers

First seen 6 Aug 2026, 08:51 UTC

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ThreatCluster AI
ThreatCluster August 7, 2026 at 08:32 UTC
  • Skipping Windows updates exposes systems to known vulnerabilities.
  • CVE-2021-34527 and WannaCry are examples of severe consequences from unpatched systems.
  • Regular updates are essential for maintaining system security and preventing attacks.

Skipping Windows updates can leave systems vulnerable to known security flaws, allowing attackers to exploit these weaknesses. Microsoft regularly patches vulnerabilities after they are discovered, but unpatched systems remain easy targets. Notable examples include the PrintNightmare vulnerability (CVE-2021-34527) and the WannaCry ransomware attack, which affected over 300,000 computers globally. The WannaCry outbreak spread through systems that had not installed critical updates released in March 2017. Users may not notice immediate issues, but unpatched systems can be compromised, leading to severe consequences such as ransomware attacks and credential theft. The safest practice is to install updates promptly and reboot when necessary. For most users, the inconvenience of a short restart is minor compared to the potential costs of recovery from a cyber incident.

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Timeline

2017-03-14
Microsoft patches SMB flaw
Microsoft released a patch for the SMB vulnerability that would later be exploited by WannaCry.
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2017-05-12
WannaCry ransomware outbreak
WannaCry ransomware spread rapidly, affecting over 300,000 computers in 150 countries due to unpatched systems.
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2021-07-01
First public PoC for CVE-2021-34527 released
Proof-of-concept exploits for the PrintNightmare vulnerability were made public, highlighting its risks.
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2021-07-02
CVE-2021-34527 published
Microsoft published details of the PrintNightmare vulnerability, which affects Windows systems.
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2021-11-03
CVE-2021-34527 added to CISA KEV
CISA added PrintNightmare to its Known Exploited Vulnerabilities catalog due to active exploitation.
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