Microsoft Windows Transport Layer Security Denial of Service Vulnerability
Priority MEDIUM 53Published · 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
A denial of service vulnerability exists in the Windows implementation of Transport Layer Security (TLS) when it improperly handles certain key exchanges. An attacker who successfully exploited the vulnerability could cause a target system to stop responding. To exploit this vulnerability, a remote unauthenticated attacker could send a specially crafted request to a target system utilizing TLS 1.2 or lower, triggering the system to automatically reboot. The update addresses the vulnerability by changing the way TLS key exchange messages are validated.
Why it matters now
EPSS 0.15153 96th percentileScored 2026-11-07
Fix Fixed Windows 10 Version 1709 (Microsoft): publicationWindows 10 Version 1709 for 32-bit Systems (Microsoft): publication+11 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 10 Version 1709 | 10.0.0 to before publication | publication | Patch available | CNA |
| Microsoft | Windows 10 Version 1709 for 32-bit Systems | 10.0.0 to before publication | publication | Patch available | CNA |
| Microsoft | Windows 10 Version 1803 | 10.0.0 to before publication | publication | Patch available | CNA |
| Microsoft | Windows 10 Version 1809 | 10.0.17763.0 to before publication | publication | Patch available | CNA |
| Microsoft | Windows 10 Version 1809 | 10.0.0 to before publication | publication | Patch available | CNA |
| Microsoft | Windows 10 Version 1903 for 32-bit Systems | 10.0.0 to before publication | publication | Patch available | CNA |
| Microsoft | Windows 10 Version 1903 for ARM64-based Systems | 10.0.0 to before publication | publication | Patch available | CNA |
| Microsoft | Windows 10 Version 1903 for x64-based Systems | 10.0.0 to before publication | publication | Patch available | CNA |
| Microsoft | Windows 10 Version 1909 | 10.0.0 to before publication | publication | Patch available | CNA |
| Microsoft | Windows Server 2019 | 10.0.17763.0 to before publication | publication | Patch available | CNA |
| Microsoft | Windows Server 2019 (Server Core installation) | 10.0.17763.0 to before publication | publication | Patch available | CNA |
| Microsoft | Windows Server, version 1803 (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, version 1909 (Server Core installation) | 10.0.0 to before publication | publication | Patch available | CNA |
- Windows 10 Version 1709 VendorMicrosoft Affected 10.0.0 to before publication Fixed in publication Patch available CNA
- Windows 10 Version 1709 for 32-bit Systems VendorMicrosoft Affected 10.0.0 to before publication Fixed in publication Patch available CNA
- Windows 10 Version 1803 VendorMicrosoft Affected 10.0.0 to before publication Fixed in publication Patch available CNA
- Windows 10 Version 1809 VendorMicrosoft Affected 10.0.17763.0 to before publication Fixed in publication Patch available CNA
- Windows 10 Version 1809 VendorMicrosoft Affected 10.0.0 to before publication Fixed in publication Patch available CNA
- Windows 10 Version 1903 for 32-bit Systems VendorMicrosoft Affected 10.0.0 to before publication Fixed in publication Patch available CNA
- Windows 10 Version 1903 for ARM64-based Systems VendorMicrosoft Affected 10.0.0 to before publication Fixed in publication Patch available CNA
- Windows 10 Version 1903 for x64-based Systems VendorMicrosoft Affected 10.0.0 to before publication Fixed in publication Patch available CNA
- Windows 10 Version 1909 VendorMicrosoft Affected 10.0.0 to before publication Fixed in publication Patch available CNA
- Windows Server 2019 VendorMicrosoft Affected 10.0.17763.0 to before publication Fixed in publication Patch available CNA
- Windows Server 2019 (Server Core installation) VendorMicrosoft Affected 10.0.17763.0 to before publication Fixed in publication Patch available CNA
- Windows Server, version 1803 (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, version 1909 (Server Core installation) VendorMicrosoft Affected 10.0.0 to before publication Fixed in publication Patch available CNA
CPE configurations NVD · 8
| CPE | Versions | Role | Vendor |
|---|---|---|---|
| cpe:2.3:o:microsoft:windows_10:1709:*:*:*:*:*:*:* | 1709 | Vulnerable | Microsoft |
| cpe:2.3:o:microsoft:windows_10:1803:*:*:*:*:*:*:* | 1803 | Vulnerable | Microsoft |
| cpe:2.3:o:microsoft:windows_10:1809:*:*:*:*:*:*:* | 1809 | Vulnerable | Microsoft |
| cpe:2.3:o:microsoft:windows_10:1903:*:*:*:*:*:*:* | 1903 | Vulnerable | Microsoft |
| cpe:2.3:o:microsoft:windows_10:1909:*:*:*:*:*:*:* | 1909 | Vulnerable | Microsoft |
| cpe:2.3:o:microsoft:windows_server_2019:-:*:*:*:*:*:*:* | not specified by NVD | Vulnerable | Microsoft |
| cpe:2.3:o:microsoft:windows_server_2019:1903:*:*:*:*:*:*:* | 1903 | Vulnerable | Microsoft |
| cpe:2.3:o:microsoft:windows_server_2019:1909:*:*:*:*:*:*:* | 1909 | Vulnerable | Microsoft |
- cpe:2.3:o:microsoft:windows_10:1709:*:*:*:*:*:*:* Versions 1709 Vulnerable ·Microsoft
- cpe:2.3:o:microsoft:windows_10:1803:*:*:*:*:*:*:* Versions 1803 Vulnerable ·Microsoft
- cpe:2.3:o:microsoft:windows_10:1809:*:*:*:*:*:*:* Versions 1809 Vulnerable ·Microsoft
- cpe:2.3:o:microsoft:windows_10:1903:*:*:*:*:*:*:* Versions 1903 Vulnerable ·Microsoft
- cpe:2.3:o:microsoft:windows_10:1909:*:*:*:*:*:*:* Versions 1909 Vulnerable ·Microsoft
- cpe:2.3:o:microsoft:windows_server_2019:-:*:*:*:*:*:*:* Versions not specified by NVD Vulnerable ·Microsoft
- cpe:2.3:o:microsoft:windows_server_2019:1903:*:*:*:*:*:*:* Versions 1903 Vulnerable ·Microsoft
- cpe:2.3:o:microsoft:windows_server_2019:1909:*:*:*:*:*:*:* Versions 1909 Vulnerable ·Microsoft
Remediation
- Fix · CNA Windows 10 Version 1709 (Microsoft) Fixed in publication
- Fix · CNA Windows 10 Version 1709 for 32-bit Systems (Microsoft) Fixed in publication
- Fix · CNA Windows 10 Version 1803 (Microsoft) Fixed in publication
- Fix · CNA Windows 10 Version 1809 (Microsoft) Fixed in publication
- Fix · CNA Windows 10 Version 1809 (Microsoft) Fixed in publication
- Fix · CNA Windows 10 Version 1903 for 32-bit Systems (Microsoft) Fixed in publication
- Fix · CNA Windows 10 Version 1903 for ARM64-based Systems (Microsoft) Fixed in publication
- Fix · CNA Windows 10 Version 1903 for x64-based Systems (Microsoft) Fixed in publication
- Fix · CNA Windows 10 Version 1909 (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 1803 (Server Core Installation) (Microsoft) Fixed in publication
- Fix · CNA Windows Server, version 1903 (Server Core installation) (Microsoft) Fixed in publication
- Fix · CNA Windows Server, version 1909 (Server Core installation) (Microsoft) Fixed in publication
Timeline
- 2026-10-02 Threatist record created from CVE-2020-1118
- 2026-10-03 Alias added: GHSA-jgvh-pmp6-rc4h
References
More Microsoft Windows 10 vulnerabilities
- TI-2015-02132 Buffer underflow in atmfd.dll in the Windows Adobe Type Manager Library in Microsoft… KEVCVSS 3.1HIGH 8.8
- TI-2022-10056 Remote Procedure Call Runtime Remote Code Execution Vulnerability CVSS 3.1CRITICAL 9.8
- TI-2022-06273 HTTP Protocol Stack Remote Code Execution Vulnerability CVSS 3.1CRITICAL 9.8
- TI-2019-00906 Remote Desktop Services Remote Code Execution Vulnerability CVSS 3.1CRITICAL 9.8
- TI-2022-15533 Windows Internet Key Exchange (IKE) Protocol Extensions Remote Code Execution Vulnerability CVSS 3.1CRITICAL 9.8
- TI-2015-01587 Mount Manager in Microsoft Windows Vista SP2, Windows Server 2008 SP2 and R2 SP1, Windows… KEVCVSS 3.1MEDIUM 6.6
Sources
- CVE-2020-1118 · CVE Program
- CVE-2020-1118 · NVD
- FIRST EPSS
- GHSA-jgvh-pmp6-rc4h · 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