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Medium 6.5Published Oct 13, 2026
CVE-2026-83648Windows Active Directory Domain Services Denial of Service Vulnerability
Updated under an hour ago ()
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It affects Microsoft Windows 10 Version 21H2 and 8 other products. Add what you run to find out whether that includes you.
No exploitation reported and no EPSS estimate yet.
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Null pointer dereference in Active Directory Domain Services allows an authorized attacker to deny service over a network.
- CVSS
- 6.5 MEDIUM (v3.1, CNA)CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H/E:U/RL:O/RC:C
- Weakness (CWE)
- CWE-476
- Known exploited
- Not in CISA's KEV catalog
- EPSS (exploitation in the next 30 days)
- Not loaded for this CVE
- Assigned by
- microsoft
- NVD analysis
- Awaiting Analysis
- Record last updated
- Oct 16, 2026
- First seen by InfoSec Signals
- Oct 13, 2026
Affected products
Microsoft Windows 10 Version 21H2 microsoft:windows_10_21h2 | from 10.0.19044.0 before 10.0.19044.7807 | CNA record |
Microsoft Windows 10 Version 22H2 microsoft:windows_10_22h2 | from 10.0.19045.0 before 10.0.19045.7807 | CNA record |
Microsoft Windows 11 version 23H2 microsoft:windows_11_23h2 | from 10.0.22631.0 before 10.0.22631.7652 | CNA record |
Microsoft Windows 11 Version 24H2 microsoft:windows_11_24h2 | from 10.0.26100.0 before 10.0.26100.9711 | CNA record |
Microsoft Windows 11 Version 25H2 microsoft:windows_11_25h2 | from 10.0.26200.0 before 10.0.26200.9711 | CNA record |
Microsoft Windows 11 version 26H1 microsoft:windows_11_26h1 | from 10.0.28000.0 before 10.0.28000.3231 | CNA record |
Microsoft Windows 11 Version 26H2 microsoft:windows_11_26h2 | from 10.0.26300.0 before 10.0.26300.9711 | CNA record |
Microsoft Windows Server 2022 microsoft:windows_server_2022 (from the name) | from 10.0.20348.0 before 10.0.20348.5761 | CNA record |
Microsoft Windows Server 2025 microsoft:windows_server_2025 (from the name) | from 10.0.26100.0 before 10.0.26100.33650 | CNA record |
References
- https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-83648vendor-advisory, patch
The CVE record on cve.org NVD's entry
The CVE record is authoritative. Products marked “from the name” were identified from the CNA's free-text names, not a CPE, and are matched less certainly. This product uses the NVD API but is not endorsed or certified by the NVD.