Published severityHigh→Operational priority:High, unchanged from published severity.unchanged
Evidence used
No CISA KEV confirmation is currently recorded.
EPSS is 0.38% for the current model date.
Compensating controls
Validate the affected product branch and deploy the verified fixed release.
Restrict local access and enforce least privilege on affected hosts.
Monitor vendor guidance and exploitation sources for a material change.
Verification
Confirm that the asset runs Microsoft Windows 10 Version 1607 and falls inside the recorded affected range.
Verify the installed build against the product-specific fixed version after deployment.
Validate exposure, authentication requirements and compensating controls in the actual environment.
Reopen this reassessment when CVSS, KEV, EPSS, exploit evidence or remediation changes.
Optional official sources
National CERT insights ?CERT means Computer Emergency Response Team; CSIRT is the closely related term Computer Security Incident Response Team.
Choose official national sources for this report. Each advisory shows its original language. Your selection is remembered on this device and included in shared links.
Official European source
ENISA European Vulnerability Database
Official EUVD identifiers, advisory evidence and known-exploited context. Missing fields are not treated as evidence of low risk.
1 current
ENISA EUVD identifier
EUVD-2026-73370
No EUVD known-exploited evidence
Authentication bypass by spoofing in Windows Netlogon allows an unauthorized attacker to perform spoofing over an adjacent network.
EUVD state
Present in the current official mapping
Known exploitation
Not present in the current ENISA EUVD known-exploited dataset. This is not proof of no exploitation.
ENISA score
7.5 · CVSS 3.1
Advisory evidence
No linked advisory details stored yet
Recommended actionWithin 7 days
High technical severity; prioritise exposed affected systems while verifying vendor guidance.
Patch available
01
What, why and how
Authentication bypass by spoofing in Windows Netlogon allows an unauthorized attacker to perform spoofing over an adjacent network.
What
Authentication bypass by spoofing in Windows Netlogon allows an unauthorized attacker to perform spoofing over an adjacent network.
Why
This attack-focused weakness is caused by incorrectly implemented authentication schemes that are subject to spoofing attacks.
How
An attacker operating through an adjacent network may attempt exploitation without authentication or user interaction. If successful, the issue may bypass an access boundary or take over an account.
What
Authentication bypass by spoofing in Windows Netlogon allows an unauthorized attacker to perform spoofing over an adjacent network.
Why
This attack-focused weakness is caused by incorrectly implemented authentication schemes that are subject to spoofing attacks.
How
An attacker operating through an adjacent network may attempt exploitation without authentication or user interaction. If successful, the issue may bypass an access boundary or take over an account.
02
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
an adjacent network → Authentication Bypass by Spoofing → bypass an access boundary or take over an account
Attack surface
Adjacent
Privileges required
None: unauthenticated exploitation is possible
User interaction
None
Attack complexity
High: exploitation depends on specific conditions
Security boundary
Unchanged: impact remains within the vulnerable component's security authority
Weakness ?CWE means Common Weakness Enumeration: a standard category for the underlying weakness.
CWE-290: Authentication Bypass by Spoofing. This attack-focused weakness is caused by incorrectly implemented authentication schemes that are subject to spoofing attacks.
CVSS vector ?CVSS means Common Vulnerability Scoring System. The vector records the metric values used to calculate technical severity.
Common Vulnerability Scoring System 3.1: the compact vector below is decoded into plain language.
AVAdjacentAttack vector: The attacker must be on an adjacent or logically close network.ACHighAttack complexity: Successful exploitation depends on specific conditions outside the attacker's direct control.PRNonePrivileges required: The attacker does not need an account or existing privileges.UINoneUser interaction: No action by another user is required.SUnchangedScope: The security impact remains within the vulnerable component's 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
Stolen credentials, tokens and legitimate administration functions may provide continued access without deploying a large custom toolset.
UnauthenticatedCWE-290
A
Official authority intelligence
Only matched European and national findings are included. Language selectors and unavailable sources are omitted.
ENISA EUVD · EUVD-2026-73370Official EUVD mapping
Authentication bypass by spoofing in Windows Netlogon allows an unauthorized attacker to perform spoofing over an adjacent network.
Official EUVD record ↗BSI · German · WID-SEC-2026-3243Microsoft Windows: Mehrere Schwachstellen
Ein Angreifer kann mehrere Schwachstellen in verschiedenen Versionen von Microsoft Windows Server, Microsoft Windows 10 und Microsoft Windows 11 ausnutzen, um seine Privilegien zu erhöhen, um einen Denial of Service herbeizuführen, um Informationen offenzulegen und um beliebigen Code auszuführen.
Official advisory ↗CERT-FR · French · CERTFR-2026-AVI-1147Multiples vulnérabilités dans Microsoft Windows
embre 2026
Bulletin de sécurité Microsoft Windows CVE-2026-56172 du 08 septembre 2026
Bulletin de sécurité Microsoft Windows CVE-2026-56177 du 08 septembre 2026
Bulletin de sécurité Microsoft Windows CVE-2026-56198 du 08 septembre 2026
Bulletin de sécurité Microsoft Windows CVE-2026-57098 du 08 septembre 2026
Bulletin de sécurité Microsoft Windows CVE-2026-62694 du 08 septembre 2026
Bulletin de sécurité Microsoft Windows CVE-2026-62697 du 08 septembre 2026
Bulletin de sécurité Microsoft Windows CVE-2026-62706 du 08 septembre 2026
Bulletin de sécurité Microsoft Windows CVE-2026-62744 du 08 septembre 2026
Bulletin de sécurité Microsoft Windows CVE-2026-62759 du 08 septembre 2026
Bulletin de sécurité Microsoft Windows CVE-2026-62762 du 08 septembre 2026
Bulletin de sécurité Microsoft Windows CVE-2026-62801 du 08 septembre 2026
Bulletin de sécurité Microsoft Windows CVE-2026-62810 du 08 septembre 2026
Bulletin de sécurité Microsoft Windows CVE-2026-62813 du 08 septembre 2026
Bulletin de sécurité Microsoft Windows CVE-2026-68824 du 08 septembre 2026
Bulletin de sécurité Microsoft Windows CVE-2026-68825 du 08 septembre 2026
Bulletin de sécurité Microsoft Windows CVE-2026-68827 du 08 septembre 2026
Bulletin de sécurité Microsoft Windows CVE-2026-68828 du 08 septembre 2026
Bulletin de sécurité Microso
Official advisory ↗CSIRT Italia · Italian · aggiornamenti-mensili-microsoft-24Aggiornamenti Mensili Microsoft
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Official advisory ↗JVN iPedia · Japanese · JVNDB-2026-035559マイクロソフトのMicrosoft Windows 10 1607等の複数製品におけるスプーフィングによる認証回避に関する脆弱性
Windows Netlogonにおけるなりすましによる認証回避の脆弱性により、不正な攻撃者が隣接するネットワーク上でなりすましを行うことが可能となります。
Official advisory ↗KISA KrCERT/CC · Korean · KNVD-6946MS 9월 보안 위협에 따른 정기 보안 업데이트 권고
9 | ASP.NET Core 서비스 거부 취약성 |
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| XBox Gaming Services | CVE-2026-58611 | XBox 게임 서비스 권한 상승 취약성 |
| .NET | CVE-2026-58649 | .NET 정보 유출 취약성 |
| Windows Installer | CVE-2026-62694 | Windows Installer 권한 상승 취약성 |
| Windows Push Notifications | CVE-2026-62697 | Windows 푸시 알림 권한 상승 취약성 |
| Microsoft Windows Media Foundation | CVE-2026-62706 | Windows 미디어 파운데이션 원격 코드 실행 취약성 |
| Microsoft Windows Media Foundation | CVE-2026-62744 | Windows 미디어 파운데이션 원격 코드 실행 취약성 |
| Windows Netlogon | CVE-2026-62759 | Windows Netlogon 스푸핑 취약성 |
| Active Directory Domain Services | CVE-2026-62762 | Windows Active Directory Domain Services 서비스 거부 취약성 |
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| Azure Arc | CVE-2026-62895 | Azure Arc SQL Server Extension 권한 상승 취약성 |
| Microsoft Discovery Studio | CVE-2026-62906 | Microsoft Di
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.
Affected versionsThe structured affected or fixed version information changed.
Before
Windows 10 Version 1607: 10.0.14393.0 < 10.0.14393.9512; Windows 10 Version 1809: 10.0.17763.0 < 10.0.17763.9245; Windows 10 Version 21H2: 10.0.19044.0 < 10.0.19044.7725; Windows 10 Version 22H2: 10.0.19045.0 < 10.0.19045.7725; Windows 11 version 23H2: 10.0.22631.0 < 10.0.22631.7582; Windows 11 Version 23H2: 10.0.22631.0 < 10.0.22631.7582; Windows 11 Version 24H2: 10.0.26100.0 < 10.0.26100.9445; Windows 11 Version 25H2: 10.0.26200.0 < 10.0.26200.9445; Windows 11 version 26H1: 10.0.28000.0 < 10.0.28000.2954; Windows Server 2012: 6.2.9200.0 < 6.2.9200.26349; Windows Server 2012 (Server Core installation): 6.2.9200.0 < 6.2.9200.26349; Windows Server 2012 R2: 6.3.9600.0 < 6.3.9600.23397; Windows Server 2012 R2 (Server Core installation): 6.3.9600.0 < 6.3.9600.23397; Windows Server 2016: 10.0.14393.0 < 10.0.14393.9512; Windows Server 2016 (Server Core installation): 10.0.14393.0 < 10.0.14393.9512; Windows Server 2019: 10.0.17763.0 < 10.0.17763.9245; Windows Server 2019 (Server Core installation): 10.0.17763.0 < 10.0.17763.9245; Windows Server 2022: 10.0.20348.0 < 10.0.20348.5622; Windows Server 2025: 10.0.26100.0 < 10.0.26100.33438; Windows Server 2025 (Server Core installation): 10.0.26100.0 < 10.0.26100.33438 · 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.
After
Windows 10 Version 1607: 10.0.14393.0 < 10.0.14393.9512; Windows 10 Version 1809: 10.0.17763.0 < 10.0.17763.9245; Windows 10 Version 21H2: 10.0.19044.0 < 10.0.19044.7725; Windows 10 Version 22H2: 10.0.19045.0 < 10.0.19045.7725; Windows 11 version 23H2: 10.0.22631.0 < 10.0.22631.7582; Windows 11 Version 23H2: 10.0.22631.0 < 10.0.22631.7582; Windows 11 Version 24H2: 10.0.26100.0 < 10.0.26100.9445; Windows 11 Version 25H2: 10.0.26200.0 < 10.0.26200.9445; Windows 11 version 26H1: 10.0.28000.0 < 10.0.28000.2954; Windows Server 2012: 6.2.9200.0 < 6.2.9200.26349; Windows Server 2012 (Server Core installation): 6.2.9200.0 < 6.2.9200.26349; Windows Server 2012 R2: 6.3.9600.0 < 6.3.9600.23398; Windows Server 2012 R2 (Server Core installation): 6.3.9600.0 < 6.3.9600.23398; Windows Server 2016: 10.0.14393.0 < 10.0.14393.9512; Windows Server 2016 (Server Core installation): 10.0.14393.0 < 10.0.14393.9512; Windows Server 2019: 10.0.17763.0 < 10.0.17763.9245; Windows Server 2019 (Server Core installation): 10.0.17763.0 < 10.0.17763.9245; Windows Server 2022: 10.0.20348.0 < 10.0.20348.5622; Windows Server 2025: 10.0.26100.0 < 10.0.26100.33438; Windows Server 2025 (Server Core installation): 10.0.26100.0 < 10.0.26100.33438 · 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.
Affected versionsThe structured affected or fixed version information changed.
Before
Windows 10 Version 1607: 10.0.14393.0 < 10.0.14393.9512; Windows 10 Version 1809: 10.0.17763.0 < 10.0.17763.9245; Windows 10 Version 21H2: 10.0.19044.0 < 10.0.19044.7725; Windows 10 Version 22H2: 10.0.19045.0 < 10.0.19045.7725; Windows 11 version 23H2: 10.0.22631.0 < 10.0.22631.7582; Windows 11 Version 23H2: 10.0.22631.0 < 10.0.22631.7582; Windows 11 Version 24H2: 10.0.26100.0 < 10.0.26100.9445; Windows 11 Version 25H2: 10.0.26200.0 < 10.0.26200.9445; Windows 11 version 26H1: 10.0.28000.0 < 10.0.28000.2954; Windows Server 2012: 6.2.9200.0 < 6.2.9200.26349; Windows Server 2012 (Server Core installation): 6.2.9200.0 < 6.2.9200.26349; Windows Server 2012 R2: 6.3.9600.0 < 6.3.9600.23397; Windows Server 2012 R2 (Server Core installation): 6.3.9600.0 < 6.3.9600.23397; Windows Server 2016: 10.0.14393.0 < 10.0.14393.9512; Windows Server 2016 (Server Core installation): 10.0.14393.0 < 10.0.14393.9512; Windows Server 2019: 10.0.17763.0 < 10.0.17763.9245; Windows Server 2019 (Server Core installation): 10.0.17763.0 < 10.0.17763.9245; Windows Server 2022: 10.0.20348.0 < 10.0.20348.5622; Windows Server 2025: 10.0.26100.0 < 10.0.26100.33438; Windows Server 2025 (Server Core installation): 10.0.26100.0 < 10.0.26100.33438 · Fixed: No fixed version is explicitly recorded in the structured CVE data.
After
Windows 10 Version 1607: 10.0.14393.0 < 10.0.14393.9512; Windows 10 Version 1809: 10.0.17763.0 < 10.0.17763.9245; Windows 10 Version 21H2: 10.0.19044.0 < 10.0.19044.7725; Windows 10 Version 22H2: 10.0.19045.0 < 10.0.19045.7725; Windows 11 version 23H2: 10.0.22631.0 < 10.0.22631.7582; Windows 11 Version 23H2: 10.0.22631.0 < 10.0.22631.7582; Windows 11 Version 24H2: 10.0.26100.0 < 10.0.26100.9445; Windows 11 Version 25H2: 10.0.26200.0 < 10.0.26200.9445; Windows 11 version 26H1: 10.0.28000.0 < 10.0.28000.2954; Windows Server 2012: 6.2.9200.0 < 6.2.9200.26349; Windows Server 2012 (Server Core installation): 6.2.9200.0 < 6.2.9200.26349; Windows Server 2012 R2: 6.3.9600.0 < 6.3.9600.23397; Windows Server 2012 R2 (Server Core installation): 6.3.9600.0 < 6.3.9600.23397; Windows Server 2016: 10.0.14393.0 < 10.0.14393.9512; Windows Server 2016 (Server Core installation): 10.0.14393.0 < 10.0.14393.9512; Windows Server 2019: 10.0.17763.0 < 10.0.17763.9245; Windows Server 2019 (Server Core installation): 10.0.17763.0 < 10.0.17763.9245; Windows Server 2022: 10.0.20348.0 < 10.0.20348.5622; Windows Server 2025: 10.0.26100.0 < 10.0.26100.33438; Windows Server 2025 (Server Core installation): 10.0.26100.0 < 10.0.26100.33438 · 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.
Affected versionsThe structured affected or fixed version information changed.
Before
10.0.14393.0 < 10.0.14393.9512; 10.0.17763.0 < 10.0.17763.9245; 10.0.19044.0 < 10.0.19044.7725; 10.0.19045.0 < 10.0.19045.7725; 10.0.22631.0 < 10.0.22631.7582; 10.0.26100.0 < 10.0.26100.9445; 10.0.26200.0 < 10.0.26200.9445 · Fixed: No fixed version is explicitly recorded in the structured CVE data.
After
Windows 10 Version 1607: 10.0.14393.0 < 10.0.14393.9512; Windows 10 Version 1809: 10.0.17763.0 < 10.0.17763.9245; Windows 10 Version 21H2: 10.0.19044.0 < 10.0.19044.7725; Windows 10 Version 22H2: 10.0.19045.0 < 10.0.19045.7725; Windows 11 version 23H2: 10.0.22631.0 < 10.0.22631.7582; Windows 11 Version 23H2: 10.0.22631.0 < 10.0.22631.7582; Windows 11 Version 24H2: 10.0.26100.0 < 10.0.26100.9445; Windows 11 Version 25H2: 10.0.26200.0 < 10.0.26200.9445; Windows 11 version 26H1: 10.0.28000.0 < 10.0.28000.2954; Windows Server 2012: 6.2.9200.0 < 6.2.9200.26349; Windows Server 2012 (Server Core installation): 6.2.9200.0 < 6.2.9200.26349; Windows Server 2012 R2: 6.3.9600.0 < 6.3.9600.23397; Windows Server 2012 R2 (Server Core installation): 6.3.9600.0 < 6.3.9600.23397; Windows Server 2016: 10.0.14393.0 < 10.0.14393.9512; Windows Server 2016 (Server Core installation): 10.0.14393.0 < 10.0.14393.9512; Windows Server 2019: 10.0.17763.0 < 10.0.17763.9245; Windows Server 2019 (Server Core installation): 10.0.17763.0 < 10.0.17763.9245; Windows Server 2022: 10.0.20348.0 < 10.0.20348.5622; Windows Server 2025: 10.0.26100.0 < 10.0.26100.33438; Windows Server 2025 (Server Core installation): 10.0.26100.0 < 10.0.26100.33438 · Fixed: No fixed version is explicitly recorded in the structured CVE data.
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.