CVE-2026-20929

highpriority · track · 11EPSS 0.029 · 87 %ileexploit · functionalDEEUJPNLRUUS

grimoire priorityP1 · Urgent

Exploitable?

Public exploit

3 exploits · functional

Likely / severe?

2.87% (87th) EPSS

CVSS 7.5 · high

Is it mine?

180 products

Check your exposure

Who says so?

7 sources

cnnvd · enisa_euvd · fstec_bdu · cert_bund

EPSS · scored 2026-10-27

Improper access control in Windows HTTP.sys allows an authorized attacker to elevate privileges over a network.

remediations

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

A vendor fix is available.

FixedWindows 10 Version 1607 for 32-bit Systemsmsrc_csaf
10.0.14393.8783:Security Update:https://support.microsoft.com/help/5073722
https://support.microsoft.com/help/5073722
FixedWindows 10 Version 1607 for x64-based Systemsmsrc_csaf
10.0.14393.8783:Security Update:https://support.microsoft.com/help/5073722
https://support.microsoft.com/help/5073722
FixedWindows 10 Version 1809 for 32-bit Systemsmsrc_csaf
10.0.17763.8276:Security Update:https://support.microsoft.com/help/5073723
https://support.microsoft.com/help/5073723
FixedWindows 10 Version 1809 for x64-based Systemsmsrc_csaf
10.0.17763.8276:Security Update:https://support.microsoft.com/help/5073723
https://support.microsoft.com/help/5073723
FixedWindows 10 Version 21H2 for 32-bit Systemsmsrc_csaf
10.0.19044.6809:Security Update:https://support.microsoft.com/help/5073724
https://support.microsoft.com/help/5073724
FixedWindows 10 Version 21H2 for ARM64-based Systemsmsrc_csaf
10.0.19044.6809:Security Update:https://support.microsoft.com/help/5073724
https://support.microsoft.com/help/5073724
FixedWindows 10 Version 21H2 for x64-based Systemsmsrc_csaf
10.0.19044.6809:Security Update:https://support.microsoft.com/help/5073724
https://support.microsoft.com/help/5073724
FixedWindows 10 Version 22H2 for 32-bit Systemsmsrc_csaf
10.0.19045.6809:Security Update:https://support.microsoft.com/help/5073724
https://support.microsoft.com/help/5073724
FixedWindows 10 Version 22H2 for ARM64-based Systemsmsrc_csaf
10.0.19045.6809:Security Update:https://support.microsoft.com/help/5073724
https://support.microsoft.com/help/5073724
FixedWindows 10 Version 22H2 for x64-based Systemsmsrc_csaf
10.0.19045.6809:Security Update:https://support.microsoft.com/help/5073724
https://support.microsoft.com/help/5073724
FixedWindows 11 Version 23H2 for ARM64-based Systemsmsrc_csaf
10.0.22631.6491:Security Update:https://support.microsoft.com/help/5073455
https://support.microsoft.com/help/5073455
FixedWindows 11 Version 23H2 for x64-based Systemsmsrc_csaf
10.0.22631.6491:Security Update:https://support.microsoft.com/help/5073455
https://support.microsoft.com/help/5073455
FixedWindows Server 2008 R2 for x64-based Systems Service Pack 1msrc_csaf
6.1.7601.28117:Monthly Rollup:https://support.microsoft.com/help/5073695
https://support.microsoft.com/help/5073695
FixedWindows Server 2008 R2 for x64-based Systems Service Pack 1 (Server Core installation)msrc_csaf
6.1.7601.28117:Monthly Rollup:https://support.microsoft.com/help/5073695
https://support.microsoft.com/help/5073695
FixedWindows Server 2008 for 32-bit Systems Service Pack 2msrc_csaf
6.0.6003.23717:Monthly Rollup:https://support.microsoft.com/help/5073697
https://support.microsoft.com/help/5073697
FixedWindows Server 2008 for 32-bit Systems Service Pack 2 (Server Core installation)msrc_csaf
6.0.6003.23717:Monthly Rollup:https://support.microsoft.com/help/5073697
https://support.microsoft.com/help/5073697
FixedWindows Server 2008 for x64-based Systems Service Pack 2msrc_csaf
6.0.6003.23717:Monthly Rollup:https://support.microsoft.com/help/5073697
https://support.microsoft.com/help/5073697
FixedWindows Server 2008 for x64-based Systems Service Pack 2 (Server Core installation)msrc_csaf
6.0.6003.23717:Monthly Rollup:https://support.microsoft.com/help/5073697
https://support.microsoft.com/help/5073697
FixedWindows Server 2012msrc_csaf
6.2.9200.25868:Monthly Rollup:https://support.microsoft.com/help/5073698
https://support.microsoft.com/help/5073698
FixedWindows Server 2012 (Server Core installation)msrc_csaf
6.2.9200.25868:Monthly Rollup:https://support.microsoft.com/help/5073698
https://support.microsoft.com/help/5073698
FixedWindows Server 2012 R2msrc_csaf
6.3.9600.22968:Monthly Rollup:https://support.microsoft.com/help/5073696
https://support.microsoft.com/help/5073696
FixedWindows Server 2012 R2 (Server Core installation)msrc_csaf
6.3.9600.22968:Monthly Rollup:https://support.microsoft.com/help/5073696
https://support.microsoft.com/help/5073696
FixedWindows Server 2016msrc_csaf
10.0.14393.8783:Security Update:https://support.microsoft.com/help/5073722
https://support.microsoft.com/help/5073722
FixedWindows Server 2016 (Server Core installation)msrc_csaf
10.0.14393.8783:Security Update:https://support.microsoft.com/help/5073722
https://support.microsoft.com/help/5073722
FixedWindows Server 2019msrc_csaf
10.0.17763.8276:Security Update:https://support.microsoft.com/help/5073723
https://support.microsoft.com/help/5073723
FixedWindows Server 2019 (Server Core installation)msrc_csaf
10.0.17763.8276:Security Update:https://support.microsoft.com/help/5073723
https://support.microsoft.com/help/5073723
FixedWindows Server 2022msrc_csaf
10.0.20348.4648:Security Update:https://support.microsoft.com/help/5073457
https://support.microsoft.com/help/5073457
FixedWindows Server 2022 (Server Core installation)msrc_csaf
10.0.20348.4648:Security Update:https://support.microsoft.com/help/5073457
https://support.microsoft.com/help/5073457
FixedWindows Server 2022, 23H2 Edition (Server Core installation)msrc_csaf
10.0.25398.2092:Security Update:https://support.microsoft.com/help/5073450
https://support.microsoft.com/help/5073450

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

v3.17.5highAV:N/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:Hsecondary · FSTEC (BDU) RU

v3.17.5highCVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H/E:U/RL:O/RC:Csecondary · ENISA EU

v3.17.5highCVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:Hsecondary · secure@microsoft.com USexploitability 1.6 · impact 5.9

v3.17.3highCVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H/E:Fsecondary · CVSS-BT (t0sche)

v3.17.5highCVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H/E:U/RL:O/RC:Csecondary · NCSC-NL NL

v3.17.5highCVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:U/C:H/I:H/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: no · Technical Impact: totalcoordinatorcisa_ssvcUS

weaknesses

The CWE weakness classes this flaw belongs to.

CWE-284USCWE-284USCWE-284US

exploits (3)

Public proof-of-concept and weaponised exploit code.

auxiliary/server/relay/esc8_kerberosESC8 Relay: SMB to HTTP(S) via Kerberosfunctional · metasploit
auxiliary/spoof/dhcp/dhcpv6_dns_takeoverDHCPv6 DNS Takeover (mitm6-style IPv6 DNS coercion)functional · metasploit
auxiliary/spoof/ipv6/ipv6_ra_dns_takeoverIPv6 Router Advertisement DNS Takeover (RDNSS IPv6 DNS coercion)functional · metasploit

affected products (180)

Products and version ranges known to be affected.

Hitachi Storageall versionscert_bundDEcpe:/h:hitachi:storage:-
Microsoft Windows 10 Version 1607all versionscert_bundDEcpe:/o:microsoft:windows_10:version_1607
Microsoft Windows 10 Version 1809all versionscert_bundDEcpe:/o:microsoft:windows_10:version_1809
Microsoft Windows 10 Version 21H2all versionscert_bundDEcpe:/o:microsoft:windows_10:version_21h2
Microsoft Windows 10 Version 22H2all versionscert_bundDEcpe:/o:microsoft:windows_10:version_22h2
Microsoft Windows 11 Version 23H2all versionscert_bundDEcpe:/o:microsoft:windows_11:version_23h2
Microsoft Windows 11 Version 24H2all versionscert_bundDEcpe:/o:microsoft:windows_11:version_24h2
Microsoft Windows 11 Windows Terminalall versionscert_bundDEcpe:/o:microsoft:windows_11:windows_terminal
Microsoft Windows Server 2008 R2 SP1all versionscert_bundDEcpe:/o:microsoft:windows_server:2008_r2_sp1
Microsoft Windows Server 2008 SP2all versionscert_bundDEcpe:/o:microsoft:windows_server:2008_sp2
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 2022 23H2 Editionall versionscert_bundDEcpe:/o:microsoft:windows_server_2022:23h2_edition
Microsoft Windows Server 2025all versionscert_bundDEcpe:/o:microsoft:windows_server_2025:-
Microsoft Windows 10 Version 160710.0.14393.0 → 10.0.14393.8783enisa_euvdEU
Microsoft Windows 10 Version 180910.0.17763.0 → 10.0.17763.8276enisa_euvdEU
Microsoft Windows 10 Version 21H210.0.19044.0 → 10.0.19044.6809enisa_euvdEU

showing 20 of 180

advisories (4)

Vendor and ecosystem advisories describing this.

NCSC-2026-0007Kwetsbaarheden verholpen in Microsoft WindowsNL2026-01-13csaf · ncsc_nlNL
Microsoft heeft kwetsbaarheden verholpen in Windows
WID-SEC-W-2026-0083Microsoft Windows : Mehrere SchwachstellenDeutsch2026-01-13csaf · cert_bundDE
Ein Angreifer kann mehrere Schwachstellen in verschiedenen Versionen von Microsoft Windows und Microsoft Windows Server ausnutzen,, um erweiterte Privilegien, einschließlich Benutzer- und Administratorrechten, zu erlangen, beliebigen Code auszuführen, Sicherheitsmaßnahmen zu umgehen, vertrauliche Informationen offenzulegen, einen Denial-of-Service-Zustand zu verursachen und Daten zu manipulieren.
msrc_CVE-2026-20929Windows HTTP.sys Elevation of Privilege Vulnerability2026-01-13csaf · msrc_csafUS
To determine the support lifecycle for your software, see the Microsoft Support Lifecycle: https://support.microsoft.com/lifecycle
JVNDB-2026-004359JVN iPedia advisory JVNDB-2026-0043592026-02-20vendor · jvndbJP

also known as (4)

Other names and identifiers for this entity.

sources

Which sources assert this record, and when.

cnnvd enisa_euvd fstec_bdu cert_bund ncsc_nl msrc_csaf jvndb NVD CVE.org MITRE

published 2026-01-13modified 2026-07-30

references (3)

External citations — patches, advisories, analysis.

scry

Attackers weaponise vulnerabilities like this against internet-exposed services. See what is exposed on your perimeter with a free passive scan.

Free scan