Security News > 2021 > January > Microsoft January 2021 Patch Tuesday fixes 83 flaws, 1 zero-day
Today is Microsoft's January 2021 Patch Tuesday, and it is the first Microsoft security update release in 2021, so please be very nice to your Windows administrators today.
With the January 2021 Patch Tuesday security updates release, Microsoft has released fixes for 83 vulnerabilities, with ten classified as Critical and 73 as Important.
Microsoft fixed both a zero-day and a publicly disclosed vulnerability as part of the January 2021 security updates.
Microsoft also patched a publicly disclosed Microsoft splwow64 Elevation of Privilege vulnerability tracked as CVE-2021-1648.
Microsoft has not released an official patch for this vulnerability.
Below is the full list of resolved vulnerabilities and released advisories in the January 2021 Patch Tuesday updates.
News URL
Related news
- Microsoft December 2024 Patch Tuesday fixes 1 exploited zero-day, 71 flaws (source)
- Microsoft January 2025 Patch Tuesday fixes 8 zero-days, 159 flaws (source)
- Microsoft holds last Patch Tuesday of the year with 72 gifts for admins (source)
- Patch Tuesday: Microsoft Patches One Actively Exploited Vulnerability, Among Others (source)
- What Is Patch Tuesday? Microsoft’s Monthly Update Explained (source)
- Week in review: Exploited Ivanti Connect Secure zero-day, Patch Tuesday forecast (source)
- Microsoft says premature patch could make Windows Recall forget how to work (source)
- December 2024 Patch Tuesday forecast: The secure future initiative impact (source)
- New Windows zero-day exposes NTLM credentials, gets unofficial patch (source)
- Week in review: Veeam Service Provider Console flaws fixed, Patch Tuesday forecast (source)
Related Vulnerability
| DATE | CVE | VULNERABILITY TITLE | RISK |
|---|---|---|---|
| 2021-01-12 | CVE-2021-1648 | Improper Privilege Management vulnerability in Microsoft products Microsoft splwow64 Elevation of Privilege Vulnerability | 0.0 |