Technology · Microsoft
Microsoft Windows 10 21h2 vulnerabilities
Updated . Rebuilt every hour.
Junglewise Threat Intelligence has tracked 105 vulnerabilities in Microsoft Windows 10 21h2: 0 in the last 7 days and 87 in the last 90 days, 8 of them critical and 6 exploited in the wild. The most recent, CVE-2026-68820, was published on 11 August 2026.
- Last 7 days
- 0
- Last 90 days
- 87
- Critical, all time
- 8
- Exploited in the wild
- 6
About Microsoft Windows 10 21h2
A specific version of the Windows 10 operating system released in the second half of 2021.
Latest Microsoft Windows 10 21h2 vulnerabilities
- CVE-2026-68820: Use after free in Windows Ancillary Function Driver for WinSock allows an authorized attacker to elevate privileges locally.criticalexploited in the wildCVSS 7EPSS 0.3%
- CVE-2026-58598: Microsoft Windows Backup Engine privilege escalationhighCVSS 7
- CVE-2026-58626: Microsoft Windows Remote Desktop Services use after freehighCVSS 8.8
- CVE-2026-58613: Microsoft Windows Cloud Files Mini Filter Driver privilege escalationhighCVSS 7.8
- CVE-2026-58547: Microsoft Windows UPnP heap overflow in upnp.dllmediumCVSS 5.5
- CVE-2026-58546: Microsoft Windows RDP information disclosure via uninitialized resourcemediumCVSS 6.5
- CVE-2026-58541: Microsoft Windows DWM type confusion privilege escalationhighCVSS 7.8
- CVE-2026-57982: Microsoft Windows RDP information disclosure via uninitialized resourcemediumCVSS 6.5
- CVE-2026-57091: Microsoft Windows File History Service stack overflow privilege escalationhighCVSS 7.8
- CVE-2026-57085: Microsoft Windows Print Spooler out-of-bounds readmediumCVSS 5.5
- CVE-2026-56650: Microsoft Windows Network File System privilege escalationhighCVSS 7.8
- CVE-2026-56647: Microsoft Windows Remote Access Service privilege escalationhighCVSS 8.8
- CVE-2026-56644: Microsoft Windows Kernel privilege escalation via use after freehighCVSS 7.8
- CVE-2026-56184: Microsoft Windows Win32K information disclosuremediumCVSS 5.5
- CVE-2026-56173: Microsoft Windows WebView use after free privilege escalationhighCVSS 7
- CVE-2026-56168: Microsoft Windows SMB Server null pointer dereferencemediumCVSS 6.5
- CVE-2026-54125: Microsoft Windows Runtime privilege escalation via race conditionhighCVSS 7.8
- CVE-2026-54115: Microsoft Windows Active Directory privilege escalationhighCVSS 7.8
- CVE-2026-50682: Microsoft Windows Active Directory out-of-bounds readhighCVSS 7.1
- CVE-2026-50668: Microsoft Windows NTFS heap overflow privilege escalationmediumCVSS 6.8
- CVE-2026-50655: Microsoft Windows Media heap buffer overflowhighCVSS 7.8
- CVE-2026-50486: Microsoft Windows Runtime use after free privilege escalationhighCVSS 7.8
- CVE-2026-50484: Microsoft Windows Kernel heap overflow privilege escalationhighCVSS 7.8
- CVE-2026-50479: Microsoft Windows USB Hub Driver privilege escalationhighCVSS 7.8
- CVE-2026-50473: Microsoft Windows File Explorer information disclosuremediumCVSS 5.5
Most severe Microsoft Windows 10 21h2 vulnerabilities
Exploited in the wild first, then by severity and CVSS score.
- CVE-2024-21412: Microsoft Windows Internet Shortcut Files Security Feature Bypass Vulnerabilitycriticalexploited in the wildCVSS 8.1
- CVE-2025-30400: Microsoft Windows DWM Core Library Use-After-Free Vulnerabilitycriticalexploited in the wildCVSS 7.8
- CVE-2025-21333: Microsoft Windows Hyper-V NT Kernel Integration VSP Heap-based Buffer Overflow Vulnerabilitycriticalexploited in the wildCVSS 7.8
- CVE-2025-21335: Microsoft Windows Hyper-V NT Kernel Integration VSP Use-After-Free Vulnerabilitycriticalexploited in the wildCVSS 7.8
- CVE-2024-21338: Microsoft Windows Kernel Exposed IOCTL with Insufficient Access Control Vulnerabilitycriticalexploited in the wildCVSS 7.8
- CVE-2026-68820: Use after free in Windows Ancillary Function Driver for WinSock allows an authorized attacker to elevate privileges locally.criticalexploited in the wildCVSS 7EPSS 0.3%
- CVE-2026-50447: Microsoft Windows Message Queuing heap overflowcriticalCVSS 9.8
- CVE-2026-49172: Microsoft Windows FTP Service heap overflow remote code executioncriticalCVSS 9.8
- CVE-2026-58626: Microsoft Windows Remote Desktop Services use after freehighCVSS 8.8
- CVE-2026-56647: Microsoft Windows Remote Access Service privilege escalationhighCVSS 8.8
Vulnerabilities per week
The last 13 weeks, by the week each vulnerability was published.
| Week of | Bar | Vulns | Critical |
|---|---|---|---|
| 29 Jun 2026 | 0 | 0 | |
| 6 Jul 2026 | 0 | 0 | |
| 13 Jul 2026 | 86 | 2 | |
| 20 Jul 2026 | 0 | 0 | |
| 27 Jul 2026 | 0 | 0 | |
| 3 Aug 2026 | 0 | 0 | |
| 10 Aug 2026 | 1 | 1 | |
| 17 Aug 2026 | 0 | 0 | |
| 24 Aug 2026 | 0 | 0 | |
| 31 Aug 2026 | 0 | 0 | |
| 7 Sep 2026 | 0 | 0 | |
| 14 Sep 2026 | 0 | 0 | |
| 21 Sep 2026 | 0 | 0 |
How this is built
Junglewise Threat Intelligence collects vulnerabilities from NVD, GitHub Security Advisories, OSV, the CISA Known Exploited Vulnerabilities catalog, FIRST EPSS and vendor advisories, and matches each one to the technologies and vendors it affects. Dates are the date a vulnerability was published, in UTC.
The pages are rebuilt from the database every hour. Frozen weekly and monthly reports never change once published, so they can be cited.
Use this data
The same data is at https://junglewise.ai/threats/technologies/windows-10-21h2.json, for scripts and language models. It is free to reuse under CC BY 4.0 with a link back to this page.
Cite as: Junglewise Threat Intelligence, "Microsoft Windows 10 21h2 vulnerabilities", https://junglewise.ai/threats/technologies/windows-10-21h2, 26 September 2026.