CVE-2019-0719: Microsoft Windows Server: Improper Input Validation

Recommended actionWithin 7 days

Critical technical severity; prioritise exposed affected systems while verifying vendor guidance.

Patch available

What, why and how

A remote code execution vulnerability exists when Windows Hyper-V Network Switch on a host server fails to properly validate input from an authenticated user on a guest operating system, aka 'Hyper-V Remote Code Execution Vulnerability'. This CVE ID is unique from CVE-2019-0721.

What

Why

The product receives input or data, but it does not validate or incorrectly validates that the input has the properties that are required to process the data safely and correctly.

How

An attacker operating through a network path may attempt exploitation with elevated privileges. If successful, the issue may execute code or commands in the affected security context.

What

Why

The product receives input or data, but it does not validate or incorrectly validates that the input has the properties that are required to process the data safely and correctly.

How

An attacker operating through a network path may attempt exploitation with elevated privileges. If successful, the issue may execute code or commands in the affected security context.

Exploit reality and attack path

CVSS severity, EPSS forecast probability, public exploit material and CISA-confirmed exploitation are separate signals.

Observed exploitation

Confirmed exploitation and public exploit material are separate signals. Attacks can occur without public proof-of-concept or exploit code.

No confirmed evidence

No CISA KEV match was present at the last successful refresh. This means no confirmation from that source, not proof of no exploitation.

Public PoC / exploit material

Confirmed exploitation and public exploit material are separate signals. Attacks can occur without public proof-of-concept or exploit code.

None recorded

No exploit-tagged reference or CISA SSVC proof-of-concept state is currently recorded. Research may still exist outside the structured feeds.

Likely attack path: a network path → Improper Input Validation → execute code or commands in the affected security context
Attack surface: Network
Privileges required: High: elevated access is required
User interaction: None
Attack complexity: Low: no specialised conditions are recorded
Security boundary: Changed: exploitation can affect a different security authority
Weakness ? CWE means Common Weakness Enumeration: a standard category for the underlying weakness.: CWE-20 ↗
CWE-20: Improper Input Validation. The product receives input or data, but it does not validate or incorrectly validates that the input has the properties that are required to process the data safely and correctly.
CVSS vector ? CVSS means Common Vulnerability Scoring System. The vector records the metric values used to calculate technical severity.: CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:C/C:H/I:H/A:H
Common Vulnerability Scoring System 3.1: the compact vector below is decoded into plain language.
AVNetworkAttack vector: The vulnerable component can be reached over a network.ACLowAttack complexity: No specialised conditions are required beyond attacker-controlled input.PRHighPrivileges required: The attacker needs elevated or administrative privileges.UINoneUser interaction: No action by another user is required.SChangedScope: The attack can affect a component governed by a different security authority.CHighConfidentiality impact: A successful attack can cause a major loss.IHighIntegrity impact: A successful attack can cause a major loss.AHighAvailability impact: A successful attack can cause a major loss.
Post-exploitation / living off the land: After compromise, an attacker may use built-in shells, scripting engines, scheduled tasks and native network utilities for discovery, persistence or movement. This is a plausible LoTL path, not evidence that it has occurred for every attack.

NetworkRemote code executionCWE-20

Official authority intelligence

Only matched European and national findings are included. Language selectors and unavailable sources are omitted.

ENISA EUVD · EUVD-2019-1479Official EUVD mapping

0 linked advisory records.

Official EUVD record ↗

CERT-FR · French · CERTFR-2019-AVI-568Multiples vulnérabilités dans Microsoft Windows

tent à un attaquant de provoquer une élévation de privilèges, un contournement de la fonctionnalité de sécurité, une usurpation d'identité, un déni de service, une atteinte à la confidentialité des données et une exécution de code à distance. Solution Se référer au bulletin de sécurité de l'éditeur pour l'obtention des correctifs (cf. section Documentation). Documentation Bulletin de sécurité Microsoft du 12 novembre 2019 https://portal.msrc.microsoft.com/fr-FR/security-guidance Référence CVE CVE-2018-12207 https://www.cve.org/CVERecord?id=CVE-2018-12207 Référence CVE CVE-2019-0712 https://www.cve.org/CVERecord?id=CVE-2019-0712 Référence CVE CVE-2019-0719 https://www.cve.org/CVERecord?id=CVE-2019-0719 Référence CVE CVE-2019-0721 https://www.cve.org/CVERecord?id=CVE-2019-0721 Référence CVE CVE-2019-0787 https://www.cve.org/CVERecord?id=CVE-2019-0787 Référence CVE CVE-2019-0788 https://www.cve.org/CVERecord?id=CVE-2019-0788 Référence CVE CVE-2019-0928 https://www.cve.org/CVERecord?id=CVE-2019-0928 Référence CVE CVE-2019-1060 https://www.cve.org/CVERecord?id=CVE-2019-1060 Référence CVE CVE-2019-11135 https://www.cve.org/CVERecord?id=CVE-2019-11135 Référence CVE CVE-2019-1166 https://www.cve.org/CVERecord?id=CVE-2019-1166 Référence CVE CVE-2019-1214 https://www.cve.org/CVERecord?id=CVE-2019-1214

Official advisory ↗

JVN iPedia · Japanese · JVNDB-2019-011763複数の Microsoft Windows 製品におけるリモートでコードを実行される脆弱性

複数の Microsoft Windows 製品には、ホストサーバ上の Windows Hyper-V ネットワークスイッチがゲストオペレーティングシステム上の認証されたユーザからの入力の適切な検証に失敗した場合、リモートでコードを実行される脆弱性が存在します。ベンダは、本脆弱性を「Hyper-V のリモートでコードが実行される脆弱性」として公開しています。本脆弱性は、CVE-2019-0719 とは異なる脆弱性です。

Official advisory ↗

JVN iPedia · Japanese · JVNDB-2019-011762複数の Microsoft Windows 製品におけるリモートでコードを実行される脆弱性

Official advisory ↗

Patch and workaround

Operational remediation based on structured source evidence.

Status ? Patch availability is based on structured fixed-version fields and authoritative update references. If no fix is verified, check the vendor advisory before making a change.: Patch available
Affected: Windows Server: 2008 R2 for x64-based Systems Service Pack 1 (Core installation), 2008 R2 for x64-based Systems Service Pack 1, 2012, 2012 (Core installation), 2012 R2, 2012 R2 (Core installation), 2016, 2016 (Core installation), version 1803 (Core Installation), 2019, 2019 (Core installation), 2008 for x64-based Systems Service Pack 2, 2008 for x64-based Systems Service Pack 2 (Core installation)
Windows: 8.1 for x64-based systems, 10 for x64-based Systems, 10 Version 1607 for x64-based Systems, 10 Version 1709 for x64-based Systems, 10 Version 1803 for x64-based Systems, 10 Version 1809 for x64-based Systems
Windows 10 Version 1903 for x64-based Systems: unspecified
Windows Server, version 1903 (Server Core installation): unspecified
Fixed: An authoritative update reference is available, but the fixed version is not recorded in the structured CVE fields. Check the linked vendor advisory for the applicable release.
Action: Review the linked authoritative reference and apply the recorded fixed release appropriate to the affected product branch.
Workaround: No verified workaround is recorded. If business-safe, reduce exposure to the affected interface and allow only trusted sources until authoritative guidance is available.

Evidence and provenance

Published 12 Nov 2019 · Last source change 4 Aug 2024, 17:51 UTC · CWE-20 · Improper Input Validation

CVE recordCVE.org · 5.1

CVSS sourceNIST NVD

EPSS source

The date BlackTree first stored a score for this CVE from the daily FIRST EPSS feed.

FIRST · tracked since 2026-09-01

European sourceENISA EUVD · EUVD-2019-1479

Product sourceCNA

Remediation sourceCVE/CNA references

CWE sourceNIST NVD

NVD statusNVD modified after enrichment

Core structured fields are present and their contributing authorities are shown above.

Material change intelligence

What changed after publication

View recent updates ↗

1 Sep 2026, 02:42 UTC
ENISA EUVD mappingEUVD-2019-1479 was added to the official ENISA EUVD mapping for this CVE.
Before
not recorded
After
{"euvdId":"EUVD-2019-1479"}
ENISA EUVD ↗
4 Aug 2024, 17:51 UTC
Vendor guidanceAuthoritative vendor guidance changed: added patch: portal.msrc.microsoft.com/CVE-2019-0719; added remediation: portal.msrc.microsoft.com/CVE-2019-0719.
Before
no authoritative guidance recorded
After
patch: portal.msrc.microsoft.com/CVE-2019-0719 · remediation: portal.msrc.microsoft.com/CVE-2019-0719
portal.msrc.microsoft.com ↗
4 Aug 2024, 17:51 UTC
Affected versionsThe structured affected or fixed version information changed.
Before
2008 R2 for x64-based Systems Service Pack 1 (Core installation); 2008 R2 for x64-based Systems Service Pack 1; 2012; 2012 (Core installation); 2012 R2; 2012 R2 (Core installation); 2016; 2016 (Core installation) · Fixed: No fixed version is explicitly recorded in the structured CVE data.
After
2008 R2 for x64-based Systems Service Pack 1 (Core installation); 2008 R2 for x64-based Systems Service Pack 1; 2012; 2012 (Core installation); 2012 R2; 2012 R2 (Core installation); 2016; 2016 (Core installation) · Fixed: An authoritative update reference is available, but the fixed version is not recorded in the structured CVE fields. Check the linked vendor advisory for the applicable release.
CNA ↗
4 Aug 2024, 17:51 UTC
Remediation statusRemediation status changed from Awaiting fix to Patch available.
Before
Awaiting fix
After
Patch available
portal.msrc.microsoft.com ↗
4 Aug 2024, 17:51 UTC
SeveritySeverity changed from Unknown to Critical.
Before
Unknown
After
Critical
NIST NVD ↗
4 Aug 2024, 17:51 UTC
CVSS scoreCVSS score changed from not recorded to 9.1 (CVSS 3.1 · NIST NVD · CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:C/C:H/I:H/A:H).
Before
not recorded
After
9.1 (CVSS 3.1 · NIST NVD · CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:C/C:H/I:H/A:H)
NIST NVD ↗
4 Aug 2024, 17:51 UTC
Catalogue recordCVE added to the BlackTree catalogue.
CNA ↗

2019-11-12CVE published

2024-08-04Fixed release or patch reference recorded

ENISA EUVD · EUVD-2019-1479↗CVE authority or vendor reference↗Official CVE record (CNA and ADP data)↗NVD record↗

Technical terms and abbreviations used in this report

CVE: Common Vulnerabilities and Exposures: the public identifier for one disclosed vulnerability.
CVSS: Common Vulnerability Scoring System: a technical severity framework; it is not patching priority by itself.
EPSS: Exploit Prediction Scoring System: FIRST's estimate of the probability that exploitation activity will be observed in the next 30 days; it is a forecast, not confirmation.
CWE: Common Weakness Enumeration: the standard category describing the underlying software or hardware weakness.
CNA: CVE Numbering Authority: an organisation authorised to assign and publish CVE records.
CISA ADP: Cybersecurity and Infrastructure Security Agency Authorized Data Publisher: structured enrichment added to a CVE record.
NVD: National Vulnerability Database: NIST's enrichment service for CVE records.
CERT / CSIRT: A computer security incident response team that publishes warnings or coordinates incident response.
PoC: Proof of concept: public material that demonstrates or helps reproduce exploitation.
CSAF: Common Security Advisory Framework: a machine-readable format for security advisories.
LoTL: Living off the land: abuse of legitimate tools or system functions during an attack.

Microsoft Windows Server: Improper Input Validation

Published severity in operational context

Evidence used

Compensating controls

Verification

National CERT insights
?
CERT means Computer Emergency Response Team; CSIRT is the closely related term Computer Security Incident Response Team.

ENISA European Vulnerability Database

EUVD-2019-1479

What, why and how

Exploit reality and attack path

Official authority intelligence

Patch and workaround

Evidence and provenance

What changed after publication