Windows DNS Denial of Service Vulnerability
Priority MEDIUM 40Published · Updated
Key facts
- Attack vector
- Network
- Privileges required
- None
- User interaction
- None
- Attack complexity
- Low
- Impact type
- —
- Confidentiality · integrity · availability
- None · None · High
- Fix status
- Fixed
Attack profile from CVSS 3.1 · CNA. Fix status from CNA.
Summary
<p>A denial of service vulnerability exists in Windows DNS when it fails to properly handle queries. An attacker who successfully exploited this vulnerability could cause the DNS service to become nonresponsive.</p> <p>To exploit the vulnerability, an authenticated attacker could send malicious DNS queries to a target, resulting in a denial of service.</p> <p>The update addresses the vulnerability by correcting how Windows DNS processes queries.</p>
Why it matters now
EPSS 0.04496 91st percentileScored 2026-11-07
Fix Fixed Windows Server version 2004 (Microsoft): publicationWindows Server 2019 (Microsoft): publication+14 more products
SSVC decision points
Not available: CISA has not published SSVC decision points for this record.
Affected products
| Vendor | Product | Affected versions | Fixed in | Status | Source |
|---|---|---|---|---|---|
| Microsoft | Windows Server version 2004 | 10.0.0 to before publication | publication | Patch available | CNA |
| Microsoft | Windows Server 2019 | 10.0.0 to before publication | publication | Patch available | CNA |
| Microsoft | Windows Server 2019 (Server Core installation) | 10.0.0 to before publication | publication | Patch available | CNA |
| Microsoft | Windows Server, version 1909 (Server Core installation) | 10.0.0 to before publication | publication | Patch available | CNA |
| Microsoft | Windows Server, version 1903 (Server Core installation) | 10.0.0 to before publication | publication | Patch available | CNA |
| Microsoft | Windows Server 2016 | 10.0.0 to before publication | publication | Patch available | CNA |
| Microsoft | Windows Server 2016 (Server Core installation) | 10.0.0 to before publication | publication | Patch available | CNA |
| Microsoft | Windows Server 2008 Service Pack 2 | 6.0.0 to before publication | publication | Patch available | CNA |
| Microsoft | Windows Server 2008 Service Pack 2 (Server Core installation) | 6.0.0 to before publication | publication | Patch available | CNA |
| Microsoft | Windows Server 2008 Service Pack 2 | 6.0.0 to before publication | publication | Patch available | CNA |
| Microsoft | Windows Server 2008 R2 Service Pack 1 | 6.1.0 to before publication | publication | Patch available | CNA |
| Microsoft | Windows Server 2008 R2 Service Pack 1 (Server Core installation) | 6.0.0 to before publication | publication | Patch available | CNA |
| Microsoft | Windows Server 2012 | 6.2.0 to before publication | publication | Patch available | CNA |
| Microsoft | Windows Server 2012 (Server Core installation) | 6.2.0 to before publication | publication | Patch available | CNA |
| Microsoft | Windows Server 2012 R2 | 6.3.0 to before publication | publication | Patch available | CNA |
| Microsoft | Windows Server 2012 R2 (Server Core installation) | 6.3.0 to before publication | publication | Patch available | CNA |
- Windows Server version 2004 VendorMicrosoft Affected 10.0.0 to before publication Fixed in publication Patch available CNA
- Windows Server 2019 VendorMicrosoft Affected 10.0.0 to before publication Fixed in publication Patch available CNA
- Windows Server 2019 (Server Core installation) VendorMicrosoft Affected 10.0.0 to before publication Fixed in publication Patch available CNA
- Windows Server, version 1909 (Server Core installation) VendorMicrosoft Affected 10.0.0 to before publication Fixed in publication Patch available CNA
- Windows Server, version 1903 (Server Core installation) VendorMicrosoft Affected 10.0.0 to before publication Fixed in publication Patch available CNA
- Windows Server 2016 VendorMicrosoft Affected 10.0.0 to before publication Fixed in publication Patch available CNA
- Windows Server 2016 (Server Core installation) VendorMicrosoft Affected 10.0.0 to before publication Fixed in publication Patch available CNA
- Windows Server 2008 Service Pack 2 VendorMicrosoft Affected 6.0.0 to before publication Fixed in publication Patch available CNA
- Windows Server 2008 Service Pack 2 (Server Core installation) VendorMicrosoft Affected 6.0.0 to before publication Fixed in publication Patch available CNA
- Windows Server 2008 Service Pack 2 VendorMicrosoft Affected 6.0.0 to before publication Fixed in publication Patch available CNA
- Windows Server 2008 R2 Service Pack 1 VendorMicrosoft Affected 6.1.0 to before publication Fixed in publication Patch available CNA
- Windows Server 2008 R2 Service Pack 1 (Server Core installation) VendorMicrosoft Affected 6.0.0 to before publication Fixed in publication Patch available CNA
- Windows Server 2012 VendorMicrosoft Affected 6.2.0 to before publication Fixed in publication Patch available CNA
- Windows Server 2012 (Server Core installation) VendorMicrosoft Affected 6.2.0 to before publication Fixed in publication Patch available CNA
- Windows Server 2012 R2 VendorMicrosoft Affected 6.3.0 to before publication Fixed in publication Patch available CNA
- Windows Server 2012 R2 (Server Core installation) VendorMicrosoft Affected 6.3.0 to before publication Fixed in publication Patch available CNA
CPE configurations NVD · 9
| CPE | Versions | Role | Vendor |
|---|---|---|---|
| cpe:2.3:o:microsoft:windows_server_2008:-:sp2:*:*:*:*:*:* | not specified by NVD | Vulnerable | Microsoft |
| cpe:2.3:o:microsoft:windows_server_2008:r2:sp1:*:*:*:*:x64:* | r2 sp1 | Vulnerable | Microsoft |
| cpe:2.3:o:microsoft:windows_server_2012:-:*:*:*:*:*:*:* | not specified by NVD | Vulnerable | Microsoft |
| cpe:2.3:o:microsoft:windows_server_2012:r2:*:*:*:*:*:*:* | r2 | Vulnerable | Microsoft |
| cpe:2.3:o:microsoft:windows_server_2016:-:*:*:*:*:*:*:* | not specified by NVD | Vulnerable | Microsoft |
| cpe:2.3:o:microsoft:windows_server_2016:1903:*:*:*:*:*:*:* | 1903 | Vulnerable | Microsoft |
| cpe:2.3:o:microsoft:windows_server_2016:1909:*:*:*:*:*:*:* | 1909 | Vulnerable | Microsoft |
| cpe:2.3:o:microsoft:windows_server_2016:2004:*:*:*:*:*:*:* | 2004 | Vulnerable | Microsoft |
| cpe:2.3:o:microsoft:windows_server_2019:-:*:*:*:*:*:*:* | not specified by NVD | Vulnerable | Microsoft |
- cpe:2.3:o:microsoft:windows_server_2008:-:sp2:*:*:*:*:*:* Versions not specified by NVD Vulnerable ·Microsoft
- cpe:2.3:o:microsoft:windows_server_2008:r2:sp1:*:*:*:*:x64:* Versions r2 sp1 Vulnerable ·Microsoft
- cpe:2.3:o:microsoft:windows_server_2012:-:*:*:*:*:*:*:* Versions not specified by NVD Vulnerable ·Microsoft
- cpe:2.3:o:microsoft:windows_server_2012:r2:*:*:*:*:*:*:* Versions r2 Vulnerable ·Microsoft
- cpe:2.3:o:microsoft:windows_server_2016:-:*:*:*:*:*:*:* Versions not specified by NVD Vulnerable ·Microsoft
- cpe:2.3:o:microsoft:windows_server_2016:1903:*:*:*:*:*:*:* Versions 1903 Vulnerable ·Microsoft
- cpe:2.3:o:microsoft:windows_server_2016:1909:*:*:*:*:*:*:* Versions 1909 Vulnerable ·Microsoft
- cpe:2.3:o:microsoft:windows_server_2016:2004:*:*:*:*:*:*:* Versions 2004 Vulnerable ·Microsoft
- cpe:2.3:o:microsoft:windows_server_2019:-:*:*:*:*:*:*:* Versions not specified by NVD Vulnerable ·Microsoft
Remediation
- Fix · CNA Windows Server version 2004 (Microsoft) Fixed in publication
- Fix · CNA Windows Server 2019 (Microsoft) Fixed in publication
- Fix · CNA Windows Server 2019 (Server Core installation) (Microsoft) Fixed in publication
- Fix · CNA Windows Server, version 1909 (Server Core installation) (Microsoft) Fixed in publication
- Fix · CNA Windows Server, version 1903 (Server Core installation) (Microsoft) Fixed in publication
- Fix · CNA Windows Server 2016 (Microsoft) Fixed in publication
- Fix · CNA Windows Server 2016 (Server Core installation) (Microsoft) Fixed in publication
- Fix · CNA Windows Server 2008 Service Pack 2 (Microsoft) Fixed in publication
- Fix · CNA Windows Server 2008 Service Pack 2 (Server Core installation) (Microsoft) Fixed in publication
- Fix · CNA Windows Server 2008 Service Pack 2 (Microsoft) Fixed in publication
- Fix · CNA Windows Server 2008 R2 Service Pack 1 (Microsoft) Fixed in publication
- Fix · CNA Windows Server 2008 R2 Service Pack 1 (Server Core installation) (Microsoft) Fixed in publication
- Fix · CNA Windows Server 2012 (Microsoft) Fixed in publication
- Fix · CNA Windows Server 2012 (Server Core installation) (Microsoft) Fixed in publication
- Fix · CNA Windows Server 2012 R2 (Microsoft) Fixed in publication
- Fix · CNA Windows Server 2012 R2 (Server Core installation) (Microsoft) Fixed in publication
Timeline
- 2026-10-02 Threatist record created from CVE-2020-1228
- 2026-10-03 Alias added: GHSA-h78g-2jmr-346w
More Microsoft Windows Server 2008 vulnerabilities
- TI-2020-01431 Netlogon Elevation of Privilege Vulnerability KEVCVSS 3.1CRITICAL 10.0
- TI-2020-01310 Improper input validation in Microsoft Windows Server KEVCVSS 3.1CRITICAL 10.0
- TI-2019-00485 Use after free in Microsoft Windows KEVCVSS 3.1CRITICAL 9.8
- TI-2017-06077 Microsoft Windows XP SP3, Windows XP x64 XP2, Windows Server 2003 SP2, Windows Vista… KEVCVSS 3.1CRITICAL 9.8
- TI-2015-01465 HTTP.sys in Microsoft Windows 7 SP1, Windows Server 2008 R2 SP1, Windows 8, Windows 8.1… KEVCVSS 3.1CRITICAL 9.8
- TI-2008-04072 The Server service in Microsoft Windows 2000 SP4, XP SP2 and SP3, Server 2003 SP1 and… KEVCVSS 3.1CRITICAL 9.8
Sources
- CVE-2020-1228 · CVE Program
- CVE-2020-1228 · NVD
- FIRST EPSS
- GHSA-h78g-2jmr-346w · GitHub Advisory Database · CC BY 4.0
This product uses the NVD API but is not endorsed or certified by the NVD. Sources and licences