Security News > 2023 > February > Microsoft February 2023 Patch Tuesday fixes 3 exploited zero-days, 77 flaws
Today is Microsoft's February 2023 Patch Tuesday, and security updates fix three actively exploited zero-day vulnerabilities and a total of 77 flaws.
This month's Patch Tuesday fixes three actively exploited zero-day vulnerabilities used in attacks.
Microsoft classifies a vulnerability as a zero-day if it is publicly disclosed or actively exploited with no official fix available.
The third actively exploited vulnerability allows an "Attacker who successfully exploited this vulnerability could gain SYSTEM privileges."
BleepingComputer has contacted Microsoft to learn more about how the CVE-2023-21715 and CVE-2023-23376 vulnerabilities were exploited in attacks.
Below is the complete list of resolved vulnerabilities and released advisories in the February 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)
- April 2025 Patch Tuesday forecast: More AI security introduced by Microsoft (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)
Related Vulnerability
| DATE | CVE | VULNERABILITY TITLE | RISK |
|---|---|---|---|
| 2023-02-14 | CVE-2023-23376 | Out-of-bounds Write vulnerability in Microsoft products Windows Common Log File System Driver Elevation of Privilege Vulnerability | 7.8 |
| 2023-02-14 | CVE-2023-21715 | Incorrect Authorization vulnerability in Microsoft 365 Apps Microsoft Publisher Security Feature Bypass Vulnerability | 7.3 |