CVE-2026-97830

highpriority · track · 30EPSS 0.009 · 58 %ileDEFRUS

grimoire priorityP2 · Scheduled

Exploitable?

—

no known exploitation

Likely / severe?

0.87% (58th) EPSS

CVSS 7.5 · high

Is it mine?

44 products

Check your exposure

Who says so?

3 sources

cert_bund · msrc_csaf · certfr

EPSS · scored 2026-10-22

Double free in Windows Internet Information Services allows an unauthorized attacker to deny service over a network.

remediations

Vendor fix, mitigation, or workaround guidance, as published by each source.

A vendor fix is available.

FixedWindows 11 Version 23H2 for ARM64-based Systemsmsrc_csaf
10.0.22631.7652:Security Update:https://support.microsoft.com/help/5126653
https://support.microsoft.com/help/5126653
FixedWindows 11 Version 23H2 for x64-based Systemsmsrc_csaf
10.0.22631.7652:Security Update:https://support.microsoft.com/help/5126653
https://support.microsoft.com/help/5126653
FixedWindows 11 Version 24H2 for ARM64-based Systemsmsrc_csaf
10.0.26100.9711:Security Update:https://support.microsoft.com/help/5127648
https://support.microsoft.com/help/5127648
FixedWindows 11 Version 24H2 for x64-based Systemsmsrc_csaf
10.0.26100.9711:Security Update:https://support.microsoft.com/help/5127648
https://support.microsoft.com/help/5127648
FixedWindows 11 Version 25H2 for ARM64-based Systemsmsrc_csaf
10.0.26200.9711:Security Update:https://support.microsoft.com/help/5127648
https://support.microsoft.com/help/5127648
FixedWindows 11 Version 25H2 for x64-based Systemsmsrc_csaf
10.0.26200.9711:Security Update:https://support.microsoft.com/help/5127648
https://support.microsoft.com/help/5127648
FixedWindows 11 Version 26H1 for ARM64-based Systemsmsrc_csaf
10.0.28000.3231:Security Update:https://support.microsoft.com/help/5127646
https://support.microsoft.com/help/5127646
FixedWindows 11 Version 26H2 for ARM64-based Systemsmsrc_csaf
10.0.26300.9711:Security Update:https://support.microsoft.com/help/5127648
https://support.microsoft.com/help/5127648
FixedWindows 11 Version 26H2 for x64-based Systemsmsrc_csaf
10.0.26300.9711:Security Update:https://support.microsoft.com/help/5127648
https://support.microsoft.com/help/5127648
FixedWindows 11 version 26H1 for x64-based Systemsmsrc_csaf
10.0.28000.3231:Security Update:https://support.microsoft.com/help/5127646
https://support.microsoft.com/help/5127646
FixedWindows Server 2022msrc_csaf
10.0.20348.5761:Security Update:https://support.microsoft.com/help/5126655
https://support.microsoft.com/help/5126655
FixedWindows Server 2022 (Server Core installation)msrc_csaf
10.0.20348.5761:Security Update:https://support.microsoft.com/help/5126655
https://support.microsoft.com/help/5126655
FixedWindows Server 2025msrc_csaf
10.0.26100.33650:Security Update:https://support.microsoft.com/help/5126646
https://support.microsoft.com/help/5126646
FixedWindows Server 2025 (Server Core installation)msrc_csaf
10.0.26100.33650:Security Update:https://support.microsoft.com/help/5126646
https://support.microsoft.com/help/5126646

cvss

Technical severity, 0–10. One row per scoring source.

7.5

010

base score 0–10 · higher = more severe · hover a vector to decode⚠ sources disagree · medium–high · 6.9–7.5

v3.17.5highCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:Hprimary · secure@microsoft.com USexploitability 3.9 · impact 3.6

v3.16.9mediumCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H/E:Usecondary · CVSS-BT (t0sche)

v3.17.5highCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H/E:U/RL:O/RC:Csecondary · Microsoft Security Response Center US

ssvc

A stakeholder decision — act, attend, or track — from exploitation and impact.

Exploitation: none · Automatable: yes · Technical Impact: partialcoordinatorcisa_ssvcUS

weaknesses

The CWE weakness classes this flaw belongs to.

CWE-415USCWE-415USCWE-415US

affected products (44)

Products and version ranges known to be affected.

Microsoft Windows 10all versionscert_bundDEcpe:/o:microsoft:windows_10:-
Microsoft Windows 11all versionscert_bundDEcpe:/o:microsoft:windows_11:-
Microsoft Windows Security Appall versionscert_bundDEcpe:/o:microsoft:windows:security_app
Microsoft Windows Server 2012all versionscert_bundDEcpe:/o:microsoft:windows_server_2012:-
Microsoft Windows Server 2012 R2all versionscert_bundDEcpe:/o:microsoft:windows_server_2012_r2:-
Microsoft Windows Server 2016all versionscert_bundDEcpe:/o:microsoft:windows_server_2016:-
Microsoft Windows Server 2019all versionscert_bundDEcpe:/o:microsoft:windows_server_2019:-
Microsoft Windows Server 2022all versionscert_bundDEcpe:/o:microsoft:windows_server_2022:-
Microsoft Windows Server 2025all versionscert_bundDEcpe:/o:microsoft:windows_server_2025:-
Microsoft Windows 11 Version 23H2 for ARM64-based Systemsall versionsfixedmsrc_csafUS
Microsoft Windows 11 Version 23H2 for ARM64-based Systems< 10.0.22631.7652msrc_csafUS
Microsoft Windows 11 Version 23H2 for x64-based Systemsall versionsfixedmsrc_csafUS
Microsoft Windows 11 Version 23H2 for x64-based Systems< 10.0.22631.7652msrc_csafUS
Microsoft Windows 11 Version 24H2 for ARM64-based Systemsall versionsfixedmsrc_csafUS
Microsoft Windows 11 Version 24H2 for ARM64-based Systems< 10.0.26100.9711msrc_csafUS
Microsoft Windows 11 Version 24H2 for x64-based Systemsall versionsfixedmsrc_csafUS
Microsoft Windows 11 Version 24H2 for x64-based Systems< 10.0.26100.9711msrc_csafUS
Microsoft Windows 11 Version 25H2 for ARM64-based Systemsall versionsfixedmsrc_csafUS
Microsoft Windows 11 Version 25H2 for ARM64-based Systems< 10.0.26200.9711msrc_csafUS
Microsoft Windows 11 Version 25H2 for x64-based Systemsall versionsfixedmsrc_csafUS

showing 20 of 44

advisories (3)

Vendor and ecosystem advisories describing this.

WID-SEC-W-2026-3892Microsoft Windows und Windows Server: Mehrere SchwachstellenDeutsch2026-10-13csaf · cert_bundDE
Ein entfernter, anonymer Angreifer kann mehrere Schwachstellen in verschiedenen Versionen von Microsoft Windows Server und Microsoft Windows ausnutzen, um seine Privilegien auf administrative Rechte zu erhöhen, um beliebigen Code auszuführen, um Informationen offenzulegen, um einen Denial of Service herbeizuführen, um den Benutzer zu täuschen und andere, nicht näher spezifizierte Auswirkungen zu verursachen.
msrc_CVE-2026-97830Windows Internet Information Services Denial of Service Vulnerability2026-10-13csaf · msrc_csafUS
To determine the support lifecycle for your software, see the Microsoft Support Lifecycle: https://support.microsoft.com/lifecycle
CERTFR-2026-AVI-1314Multiples vulnérabilités dans Microsoft WindowsFrançais2026-10-14vendor · certfrFR

sources

Which sources assert this record, and when.

cert_bund msrc_csaf certfr NVD CVE.org MITRE

published 2026-10-13modified 2026-10-14

references (1) nvd

External citations — patches, advisories, analysis.

https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-97830Vendor Advisory

scry

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