Microsoft · ServicingStack update · January 13, 2026
KB5073450: January 2026 cumulative update for Windows Server 23H2
KB5073450, released January 13, 2026, fixes 79 CVEs in Windows Server 2022, 23H2 Edition (Server Core installation) (build 25398.2092). One of them is being exploited (CVE-2026-20805); 1 on CISA KEV. Patch Radar priority: Patch now. The product is no longer supported.
Patch now1 on CISA KEV2 publicly disclosedUnsupported product
CVEs closed
79
2 rated Critical
Exploited
1
CVE-2026-20805
Exploitation more likely
9
Microsoft's assessment
Highest EPSS
0.1979
97th percentile
Priority of the 79 CVEs
Patch now 1
Urgent 11
High 42
Routine 25
Applies to
| Product | Build after install |
|---|---|
| Windows Server 2022, 23H2 Edition (Server Core installation) | 25398.2092 |
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-2026-20876 | 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-2026-20929 | Windows HTTP.sys | Elevation of Privilege | 7.5 | 0.0287 | Exploitation Unlikely |
| 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 79
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