Microsoft · Security update · January 13, 2026
KB5073379: January 2026 cumulative update for Windows Server 2025
KB5073379, released January 13, 2026, fixes 85 CVEs across 2 products. One of them is being exploited (CVE-2026-20805); 1 on CISA KEV. Patch Radar priority: Patch now.
Patch now1 on CISA KEV2 publicly disclosed
CVEs closed
85
3 rated Critical
Exploited
1
CVE-2026-20805
Exploitation more likely
9
Microsoft's assessment
Highest EPSS
0.1979
97th percentile
Priority of the 85 CVEs
Patch now 1
Urgent 12
High 46
Routine 26
Applies to
| Product | Build after install |
|---|---|
| Windows Server 2025 | 26100.32230 |
| Windows Server 2025 (Server Core installation) | 26100.32230 |
CVEs this fix closes
| Priority | CVE | Component | Impact | CVSS | EPSS | Exploitation |
|---|---|---|---|---|---|---|
| Patch now | CVE-2026-20805 | Desktop Window Manager | Information Disclosure | 5.5 | 0.0746 | KEVExploited |
| Urgent | CVE-2026-20860 | Windows Ancillary Function Driver for WinSock | Elevation of Privilege | 7.8 | 0.0828 | More likely |
| Urgent | CVE-2026-20817 | Windows Error Reporting | Elevation of Privilege | 7.8 | 0.0542 | More likely |
| Urgent | CVE-2026-20840 | Windows NTFS | Remote Code Execution | 7.8 | 0.0459 | More likely |
| Urgent | CVE-2026-20871 | Desktop Window Manager | Elevation of Privilege | 7.8 | 0.0414 | More likely |
| Urgent | CVE-2026-20843 | Windows Routing and Remote Access Service (RRAS) | Elevation of Privilege | 7.8 | 0.0342 | More likely |
| Urgent | CVE-2026-20820 | Windows Common Log File System Driver | Elevation of Privilege | 7.8 | 0.0256 | More likely |
| Urgent | CVE-2026-20816 | Windows Installer | Elevation of Privilege | 7.8 | 0.0244 | More likely |
| Urgent | CVE-2026-20922 | Windows NTFS | Remote Code Execution | 7.8 | 0.0108 | More likely |
| Urgent | CVE-2026-20854 | Windows Local Security Authority Subsystem Service (LSASS) | Remote Code Execution | 7.5 | 0.0108 | Exploitation Less Likely |
| Urgent | CVE-2026-20876 | Windows Virtualization-Based Security (VBS) Enclave | Elevation of Privilege | 6.7 | 0.0051 | Exploitation Less Likely |
| Urgent | CVE-2023-31096 | Agere Windows Modem Driver | Elevation of Privilege | 7.8 | 0.0048 | DisclosedMore likely |
| Urgent | CVE-2026-20822 | Microsoft Graphics Component | Elevation of Privilege | 7.8 | 0.0039 | Exploitation Less Likely |
| High | CVE-2026-20875 | Windows Local Security Authority Subsystem Service (LSASS) | Denial of Service | 7.5 | 0.0154 | Exploitation Less Likely |
| High | CVE-2026-20868 | Windows Routing and Remote Access Service (RRAS) | Remote Code Execution | 8.8 | 0.0139 | Exploitation Less Likely |
| High | CVE-2026-20921 | Windows SMB Server | Elevation of Privilege | 7.5 | 0.0118 | Exploitation Unlikely |
| High | CVE-2024-55414 | Windows Motorola Soft Modem Driver | Elevation of Privilege | 7.8 | 0.0114 | Exploitation Unlikely |
| High | CVE-2026-20856 | Windows Server Update Service | Remote Code Execution | 8.1 | 0.0112 | Exploitation Less Likely |
| High | CVE-2026-20849 | Windows Kerberos | Elevation of Privilege | 7.5 | 0.0101 | Exploitation Unlikely |
| High | CVE-2026-20931 | Windows Telephony Service | Elevation of Privilege | 8.0 | 0.0085 | Exploitation Unlikely |
| High | CVE-2026-20919 | Windows SMB Server | Elevation of Privilege | 7.5 | 0.0080 | Exploitation Unlikely |
| High | CVE-2026-20926 | Windows SMB Server | Elevation of Privilege | 7.5 | 0.0080 | Exploitation Unlikely |
| High | CVE-2026-20848 | Windows SMB Server | Elevation of Privilege | 7.5 | 0.0075 | Exploitation Unlikely |
| High | CVE-2026-20934 | Windows SMB Server | Elevation of Privilege | 7.5 | 0.0075 | Exploitation Unlikely |
| High | CVE-2026-20837 | Windows Media | Remote Code Execution | 7.8 | 0.0068 | Exploitation Less Likely |
Showing 1 to 25 of 85
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