CVE-2019-0709 [High] | Input Validation Bypass in Windows 10

A remote code execution vulnerability exists when Windows Hyper-V on a host server fails to properly validate input from an authenticated user on a guest operating system. To exploit the vulnerability, an attacker could run a specially crafted application on a guest operating system that could cause the Hyper-V host operating system to execute arbitrary code. An attacker who successfully exploited the vulnerability could execute arbitrary code on the host operating system. The security update addresses the vulnerability by correcting how Hyper-V validates guest operating system user input.

#	Date	Old EPSS score	New EPSS score	Delta (New - Old)
1	2026-06-15	37.31%	4.04%	-33.27%
2	2026-03-04	29.63%	37.31%	+7.69%
3	2026-03-01	—	29.63%	—

Date

Old EPSS score

New EPSS score

Delta (New - Old)

2026-06-15

37.31%

4.04%

-33.27%

2026-03-04

29.63%

37.31%

+7.69%

2026-03-01

—

29.63%

—

Base score	Version	Severity	Vector	Exploitability	Impact	Score source
7.6	3.1	HIGH	`CVSS:3.1/AV:A/AC:H/PR:H/UI:N/S:C/C:H/I:H/A:H` Click to expand Attack vector (AV:A) Attacker has to be nearby on the network—same office, same link, that vibe—not the whole wide internet. Attack complexity (AC:H) Even with access, the exploit needs extra luck, timing, or a fussy environment to actually work. Privileges required (PR:H) They need powerful rights—admin, root, or similar—before this pays off. User interaction (UI:N) Nobody has to click “OK” or open a trap file; it can work without a victim helping. Scope (S:C) Breaking this can reach past the original component and bite other resources—bigger blast radius. Confidentiality (C:H) Serious risk that confidential data gets exposed in a big way. Integrity (I:H) They could widely tamper with or forge data—trust in the data is badly hurt. Availability (A:H) Could take the service down hard or make it unusable for people who depend on it.	1.0	6.0	[email protected]
8.4	3.0	HIGH	`CVSS:3.0/AV:A/AC:L/PR:H/UI:N/S:C/C:H/I:H/A:H` Click to expand Attack vector (AV:A) Attacker has to be nearby on the network—same office, same link, that vibe—not the whole wide internet. Attack complexity (AC:L) Once they can reach the bug, pulling it off is straightforward—no weird race conditions or rare setup. Privileges required (PR:H) They need powerful rights—admin, root, or similar—before this pays off. User interaction (UI:N) Nobody has to click “OK” or open a trap file; it can work without a victim helping. Scope (S:C) Breaking this can reach past the original component and bite other resources—bigger blast radius. Confidentiality (C:H) Serious risk that confidential data gets exposed in a big way. Integrity (I:H) They could widely tamper with or forge data—trust in the data is badly hurt. Availability (A:H) Could take the service down hard or make it unusable for people who depend on it.	1.7	6.0	[email protected]
7.7	2.0	HIGH	`AV:A/AC:L/Au:S/C:C/I:C/A:C` Click to expand Access vector (AV:A) Requires access to an adjacent network segment. Access complexity (AC:L) Exploitation conditions are straightforward and predictable. Authentication (AU:S) A single authentication is required. Confidentiality impact (C:C) Complete confidentiality impact. Integrity impact (I:C) Complete integrity impact. Availability impact (A:C) Complete availability impact.	5.1	10.0	[email protected]

Base score

Version

Severity

Vector

Exploitability

Impact

Score source

7.6

3.1

HIGH

CVSS:3.1/AV:A/AC:H/PR:H/UI:N/S:C/C:H/I:H/A:H Click to expand

Attack vector (AV:A): Attacker has to be nearby on the network—same office, same link, that vibe—not the whole wide internet.
Attack complexity (AC:H): Even with access, the exploit needs extra luck, timing, or a fussy environment to actually work.
Privileges required (PR:H): They need powerful rights—admin, root, or similar—before this pays off.
User interaction (UI:N): Nobody has to click “OK” or open a trap file; it can work without a victim helping.
Scope (S:C): Breaking this can reach past the original component and bite other resources—bigger blast radius.
Confidentiality (C:H): Serious risk that confidential data gets exposed in a big way.
Integrity (I:H): They could widely tamper with or forge data—trust in the data is badly hurt.
Availability (A:H): Could take the service down hard or make it unusable for people who depend on it.

1.0

6.0

[email protected]

8.4

3.0

HIGH

CVSS:3.0/AV:A/AC:L/PR:H/UI:N/S:C/C:H/I:H/A:H Click to expand

Attack vector (AV:A): Attacker has to be nearby on the network—same office, same link, that vibe—not the whole wide internet.
Attack complexity (AC:L): Once they can reach the bug, pulling it off is straightforward—no weird race conditions or rare setup.
Privileges required (PR:H): They need powerful rights—admin, root, or similar—before this pays off.
User interaction (UI:N): Nobody has to click “OK” or open a trap file; it can work without a victim helping.
Scope (S:C): Breaking this can reach past the original component and bite other resources—bigger blast radius.
Confidentiality (C:H): Serious risk that confidential data gets exposed in a big way.
Integrity (I:H): They could widely tamper with or forge data—trust in the data is badly hurt.
Availability (A:H): Could take the service down hard or make it unusable for people who depend on it.

1.7

6.0

[email protected]

7.7

2.0

HIGH

AV:A/AC:L/Au:S/C:C/I:C/A:C Click to expand

Access vector (AV:A): Requires access to an adjacent network segment.
Access complexity (AC:L): Exploitation conditions are straightforward and predictable.
Authentication (AU:S): A single authentication is required.
Confidentiality impact (C:C): Complete confidentiality impact.
Integrity impact (I:C): Complete integrity impact.
Availability impact (A:C): Complete availability impact.

5.1

10.0

[email protected]

Affected software / configurations for CVE-2019-0709

Vendor	Product	Version	Raw CPE
microsoft	windows_10	—	cpe:2.3:o:microsoft:windows_10:-::::::x64:
microsoft	windows_10	1607	cpe:2.3:o:microsoft:windows_10:1607::::::x64:
microsoft	windows_10	1703	cpe:2.3:o:microsoft:windows_10:1703::::::x64:
microsoft	windows_10	1709	cpe:2.3:o:microsoft:windows_10:1709::::::x64:
microsoft	windows_server_2016	—	cpe:2.3:o:microsoft:windows_server_2016:-:::::::*

References for CVE-2019-0709

URL	Tags
https://msrc.microsoft.com/update-guide/vulnerability/CVE-2019-0709
https://portal.msrc.microsoft.com/en-US/security-guidance/advisory/CVE-2019-0709	Patch Vendor Advisory

URL

CVE-2019-0709 | Windows Hyper-V Remote Code Execution Vulnerability

Exploit prediction scoring system (EPSS) score for CVE-2019-0709

Common vulnerability scoring system (CVSS) metrics for CVE-2019-0709

Weakness enumeration for CVE-2019-0709

Affected software / configurations for CVE-2019-0709

References for CVE-2019-0709