CVE-2019-1309

Name: CVE-2019-1309
Creator: NVD / NIST
Published: 2019-11-12T19:15:11.753+00:00
License: https://creativecommons.org/publicdomain/zero/1.0/

MEDIUMCVSS 6.8/10EPSS 5.14%

Last modified Jun 17, 2026

CVE-2019-1309 is a medium-severity vulnerability rated 6.8/10 on the CVSS scale. A denial of service vulnerability exists when Microsoft Hyper-V Network Switch on a host server fails to properly validate input from a privileged user on a guest operating system, aka 'Windows Hyper-V Denial of Service Vulnerability'. This CVE ID is unique from CVE-2019-0712, CVE-2019-1310, CVE-2019-1399.. EPSS estimates a 5.14% chance of exploitation in the next 30 days.

Description

A denial of service vulnerability exists when Microsoft Hyper-V Network Switch on a host server fails to properly validate input from a privileged user on a guest operating system, aka 'Windows Hyper-V Denial of Service Vulnerability'. This CVE ID is unique from CVE-2019-0712, CVE-2019-1310, CVE-2019-1399.

Metrics

CVSS 3.1

6.8/10

CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:C/C:N/I:N/A:H

EPSS Probability

5.14%

91.3th percentile

Probability of exploitation in the next 30 days. Learn more

Weakness Enumeration

CWE-20

Affected Software

Vendor	Product	Versions
Microsoft	Windows 10	1709
Microsoft	Windows 10	1803
Microsoft	Windows 10	1809
Microsoft	Windows 10	1903
Microsoft	Windows Server 2016	1803
Microsoft	Windows Server 2016	1903
Microsoft	Windows Server 2019	All versions

References

https://portal.msrc.microsoft.com/en-US/security-guidance/advisory/CVE-2019-1309Patch, Vendor Advisory
https://portal.msrc.microsoft.com/en-US/security-guidance/advisory/CVE-2019-1309Patch, Vendor Advisory

Timeline

Published: Nov 12, 2019
Last Modified: Jun 17, 2026
Status: Modified

Frequently Asked Questions

What is CVE-2019-1309?

How severe is CVE-2019-1309?

CVE-2019-1309 has a CVSS score of 6.8/10 (MEDIUM severity). The EPSS model estimates a 5.14% probability of exploitation in the next 30 days.

How do I fix CVE-2019-1309?

Check the vendor references and advisories linked above for patched versions and mitigation guidance. You can also run a Strix scan to test if your systems are affected.

Are you affected by CVE-2019-1309?

Run a free Strix scan to check your systems for this vulnerability.

Scan your code now

Source: NVD / NIST