TI-2020-12887 Aliases CVE-2020-16894 GHSA-c7jg-8cqr-88pq

Windows NAT Denial of Service Vulnerability

MEDIUM 41Published 2020-10-16 · Updated 2024-10-01

Key facts

Attack vector: Network
Privileges required: Low
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 when Windows Network Address Translation (NAT) on a host server fails to properly validate input from a privileged user on a guest operating system. An attacker who successfully exploited the vulnerability could cause the host server to crash. To exploit the vulnerability, an attacker who already has a privileged account on a guest operating system, running as a virtual machine, could run a specially crafted application that causes a host machine to crash. The update addresses the vulnerability by modifying how Windows NAT accesses the host.

Why it matters now

Exploitation None reported CISA SSVC · not in CISA KEV

EPSS 0.04938 92nd percentileScored 2026-11-07

Fix Fixed Windows 10 Version 1607 (Microsoft): publicationWindows Server 2016 (Microsoft): publication+1 more product

SSVC decision points

CISA ADP · SSVC 2.0.3

Exploitation: None
Automatable: No
Technical impact: Partial

The decision (Track, Attend, Act) also depends on your mission and well-being impact; see CISA's SSVC guide.

Affected products

Vendor	Product	Affected versions	Fixed in	Status	Source
Microsoft	Windows 10 Version 1607	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

Windows 10 Version 1607 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

CPE configurations NVD · 2

CPE	Versions	Role	Vendor
cpe:2.3:o:microsoft:windows_10:1607::::::x64:	1607	Vulnerable	Microsoft
cpe:2.3:o:microsoft:windows_server_2016:-:::::::*	not specified by NVD	Vulnerable	Microsoft

cpe:2.3:o:microsoft:windows_10:1607:*:*:*:*:*:x64:* Versions 1607 Vulnerable ·Microsoft
cpe:2.3:o:microsoft:windows_server_2016:-:*:*:*:*:*:*:* Versions not specified by NVD Vulnerable ·Microsoft

Remediation

Fix · CNA Windows 10 Version 1607 (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

Timeline

2026-10-02 Threatist record created from CVE-2020-16894
2026-10-03 Alias added: GHSA-c7jg-8cqr-88pq

References

Patch 1

https://portal.msrc.microsoft.com/en-US/security-guidance/advisory/CVE-2020-16894

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Sources

This product uses the NVD API but is not endorsed or certified by the NVD. Sources and licences