Microsoft · Security update · January 13, 2026
KB5073724: January 2026 cumulative update for Windows 10 21H2
KB5073724, released January 13, 2026, fixes 72 CVEs across 6 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
72
1 rated Critical
Exploited
1
CVE-2026-20805
Exploitation more likely
9
Microsoft's assessment
Highest EPSS
0.1979
97th percentile
Priority of the 72 CVEs
Patch now 1
Urgent 10
High 40
Routine 21
Applies to
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-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 |
| High | CVE-2026-20864 | Connected Devices Platform Service (Cdpsvc) | Elevation of Privilege | 7.8 | 0.0055 | Exploitation Unlikely |
Showing 1 to 25 of 72
1Next
Product names, logos and trademarks shown on Patch Radar belong to their respective owners. They are used only to identify the software each security fix applies to and to help readers find their platform. Their use does not imply any affiliation with, or endorsement by, those owners, and Patchblox is not affiliated with any of them.