Security News > 2023 > May > Microsoft May 2023 Patch Tuesday fixes 3 zero-days, 38 flaws
Today is Microsoft's May 2023 Patch Tuesday, and security updates fix three zero-day vulnerabilities and a total of 38 flaws.
Today's Patch Tuesday is one of the smallest in terms of resolved vulnerabilities, with only thirty-eight vulnerabilities fixed, not including eleven Microsoft Edge vulnerabilities fixed last week, on May 5th. Three zero-days fixed.
This month's Patch Tuesday fixes three zero-day vulnerabilities, with two exploited in attacks and another publicly disclosed.
Microsoft classifies a vulnerability as a zero-day if it is publicly disclosed or actively exploited with no official fix available.
With today's Patch Tuesday, Microsoft fixed the vulnerability used by the bootkit but has not enabled it by default.
Below is the complete list of resolved vulnerabilities in the May 2023 Patch Tuesday updates.
News URL
Related news
- Microsoft April 2025 Patch Tuesday fixes exploited zero-day, 134 flaws (source)
- Patch Tuesday: Microsoft Fixes 134 Vulnerabilities, Including 1 Zero-Day (source)
- Microsoft May 2025 Patch Tuesday fixes 5 exploited zero-days, 72 flaws (source)
- Patch Tuesday: Microsoft fixes 5 actively exploited zero-days (source)
- Microsoft's May Patch Tuesday update fails on some Windows 11 VMs (source)
- Week in review: Probing activity on Palo Alto Networks GlobalProtect portals, Patch Tuesday forecast (source)
- Microsoft: Windows CLFS zero-day exploited by ransomware gang (source)
- Microsoft fixes actively exploited Windows CLFS zero-day (CVE-2025-29824) (source)
- April's Patch Tuesday leaves unlucky Windows Hello users unable to login (source)
- Emergency patch for potential SAP zero-day that could grant full system control (source)