CVE-2021-26886

lowpriority · track · 14EPSS 0.011 · 66 %ileEURUUS

grimoire priorityP3 · Track

Exploitable?

—

no known exploitation

Likely / severe?

1.13% (66th) EPSS

CVSS 3.6 · low

Is it mine?

119 products

Check your exposure

Who says so?

4 sources

cnnvd · enisa_euvd · fstec_bdu · msrc_csaf

EPSS · scored 2026-10-28

User Profile Service Denial of Service Vulnerability

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
10.0.14393.4283:Security Update:https://support.microsoft.com/help/5000803
https://support.microsoft.com/help/5000803
FixedWindows 10 Version 1607 for x64-based Systemsmsrc_csaf
10.0.14393.4283:Security Update:https://support.microsoft.com/help/5000803
https://support.microsoft.com/help/5000803
FixedWindows 10 Version 1803 for 32-bit Systemsmsrc_csaf
10.0.17134.2087:Security Update:https://support.microsoft.com/help/5000809
https://support.microsoft.com/help/5000809
FixedWindows 10 Version 1803 for ARM64-based Systemsmsrc_csaf
10.0.17134.2087:Security Update:https://support.microsoft.com/help/5000809
https://support.microsoft.com/help/5000809
FixedWindows 10 Version 1803 for x64-based Systemsmsrc_csaf
10.0.17134.2087:Security Update:https://support.microsoft.com/help/5000809
https://support.microsoft.com/help/5000809
FixedWindows 10 Version 1809 for 32-bit Systemsmsrc_csaf
10.0.17763.1817:Security Update:https://support.microsoft.com/help/5000822
https://support.microsoft.com/help/5000822
FixedWindows 10 Version 1809 for ARM64-based Systemsmsrc_csaf
10.0.17763.1817:Security Update:https://support.microsoft.com/help/5000822
https://support.microsoft.com/help/5000822
FixedWindows 10 Version 1809 for x64-based Systemsmsrc_csaf
10.0.17763.1817:Security Update:https://support.microsoft.com/help/5000822
https://support.microsoft.com/help/5000822
FixedWindows 10 Version 1909 for 32-bit Systemsmsrc_csaf
10.0.18363.1440:Security Update:https://support.microsoft.com/help/5000808
https://support.microsoft.com/help/5000808
FixedWindows 10 Version 1909 for ARM64-based Systemsmsrc_csaf
10.0.18363.1440:Security Update:https://support.microsoft.com/help/5000808
https://support.microsoft.com/help/5000808
FixedWindows 10 Version 1909 for x64-based Systemsmsrc_csaf
10.0.18363.1440:Security Update:https://support.microsoft.com/help/5000808
https://support.microsoft.com/help/5000808
FixedWindows 10 Version 2004 for 32-bit Systemsmsrc_csaf
10.0.19043.867:Security Update:https://support.microsoft.com/help/5000802
https://support.microsoft.com/help/5000802
FixedWindows 10 Version 2004 for ARM64-based Systemsmsrc_csaf
10.0.19043.867:Security Update:https://support.microsoft.com/help/5000802
https://support.microsoft.com/help/5000802
FixedWindows 10 Version 2004 for x64-based Systemsmsrc_csaf
10.0.19043.867:Security Update:https://support.microsoft.com/help/5000802
https://support.microsoft.com/help/5000802
FixedWindows 10 Version 20H2 for 32-bit Systemsmsrc_csaf
10.0.19043.867:Security Update:https://support.microsoft.com/help/5000802
https://support.microsoft.com/help/5000802
FixedWindows 10 Version 20H2 for ARM64-based Systemsmsrc_csaf
10.0.19043.867:Security Update:https://support.microsoft.com/help/5000802
https://support.microsoft.com/help/5000802
FixedWindows 10 for 32-bit Systemsmsrc_csaf
10.0.10240.18874:Security Update:https://support.microsoft.com/help/5000807
https://support.microsoft.com/help/5000807
FixedWindows 10 for x64-based Systemsmsrc_csaf
10.0.10240.18874:Security Update:https://support.microsoft.com/help/5000807
https://support.microsoft.com/help/5000807
FixedWindows 8.1 for 32-bit systemsmsrc_csaf
6.3.9600.19968:Monthly Rollup:https://support.microsoft.com/help/5000848
https://support.microsoft.com/help/5000848
FixedWindows 8.1 for x64-based systemsmsrc_csaf
6.3.9600.19968:Monthly Rollup:https://support.microsoft.com/help/5000848
https://support.microsoft.com/help/5000848
FixedWindows RT 8.1msrc_csaf
6.3.9600.19968:Monthly Rollup:https://support.microsoft.com/help/5000848
https://support.microsoft.com/help/5000848
FixedWindows Server 2012msrc_csaf
Security Only:https://support.microsoft.com/help/5000840
https://support.microsoft.com/help/5000840
FixedWindows Server 2012 (Server Core installation)msrc_csaf
Security Only:https://support.microsoft.com/help/5000840
https://support.microsoft.com/help/5000840
FixedWindows Server 2012 R2msrc_csaf
6.3.9600.19968:Monthly Rollup:https://support.microsoft.com/help/5000848
https://support.microsoft.com/help/5000848
FixedWindows Server 2012 R2 (Server Core installation)msrc_csaf
6.3.9600.19968:Monthly Rollup:https://support.microsoft.com/help/5000848
https://support.microsoft.com/help/5000848
FixedWindows Server 2016msrc_csaf
10.0.14393.4283:Security Update:https://support.microsoft.com/help/5000803
https://support.microsoft.com/help/5000803
FixedWindows Server 2016 (Server Core installation)msrc_csaf
10.0.14393.4283:Security Update:https://support.microsoft.com/help/5000803
https://support.microsoft.com/help/5000803
FixedWindows Server 2019msrc_csaf
10.0.17763.1817:Security Update:https://support.microsoft.com/help/5000822
https://support.microsoft.com/help/5000822
FixedWindows Server 2019 (Server Core installation)msrc_csaf
10.0.17763.1817:Security Update:https://support.microsoft.com/help/5000822
https://support.microsoft.com/help/5000822
FixedWindows Server, version 1909 (Server Core installation)msrc_csaf
10.0.18363.1440:Security Update:https://support.microsoft.com/help/5000808
https://support.microsoft.com/help/5000808
FixedWindows Server, version 2004 (Server Core installation)msrc_csaf
10.0.19043.867:Security Update:https://support.microsoft.com/help/5000802
https://support.microsoft.com/help/5000802
FixedWindows Server, version 20H2 (Server Core Installation)msrc_csaf
10.0.19043.867:Security Update:https://support.microsoft.com/help/5000802
https://support.microsoft.com/help/5000802

cvss

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

6.1

010

base score 0–10 · higher = more severe · hover a vector to decode⚠ sources disagree · low–medium · 3.1–6.1

v2.03.6lowAV:L/AC:L/Au:N/C:N/I:P/A:Pprimary · NVD / NIST USexploitability 3.9 · impact 4.9

v2.03.1lowAV:L/AC:L/Au:N/C:N/I:P/A:P/E:Usecondary · CVSS-BT (t0sche)

v3.15.5mediumAV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:Hsecondary · FSTEC (BDU) RU

v3.16.1mediumCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:L/A:Hsecondary · secure@microsoft.com USexploitability 1.8 · impact 4.2

v3.16.1mediumCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:L/A:H/E:U/RL:O/RC:Csecondary · Microsoft Security Response Center US

v3.16.1mediumCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:L/A:H/E:U/RL:O/RC:Csecondary · ENISA EU

v3.16.1mediumCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:L/A:Hsecondary · NVD / NIST USexploitability 1.8 · impact 4.2

weaknesses

The CWE weakness classes this flaw belongs to.

CWE-119US

affected products (119)

Products and version ranges known to be affected.

Microsoft Windows 10 Version 150710.0.0 → publicationenisa_euvdEU
Microsoft Windows 10 Version 160710.0.0 → publicationenisa_euvdEU
Microsoft Windows 10 Version 180310.0.0 → publicationenisa_euvdEU
Microsoft Windows 10 Version 180910.0.0 → publicationenisa_euvdEU
Microsoft Windows 10 Version 190910.0.0 → publicationenisa_euvdEU
Microsoft Windows 10 Version 200410.0.0 → publicationenisa_euvdEU
Microsoft Windows 10 Version 20H210.0.0 → publicationenisa_euvdEU
Microsoft Windows 8.16.3.0 → publicationenisa_euvdEU
Microsoft Windows Server 20126.2.0 → publicationenisa_euvdEU
Microsoft Windows Server 2012 (Server Core installation)6.2.0 → publicationenisa_euvdEU
Microsoft Windows Server 2012 R26.3.0 → publicationenisa_euvdEU
Microsoft Windows Server 2012 R2 (Server Core installation)6.3.0 → publicationenisa_euvdEU
Microsoft Windows Server 201610.0.0 → publicationenisa_euvdEU
Microsoft Windows Server 2016 (Server Core installation)10.0.0 → publicationenisa_euvdEU
Microsoft Windows Server 201910.0.0 → publicationenisa_euvdEU
Microsoft Windows Server 2019 (Server Core installation)10.0.0 → publicationenisa_euvdEU
Microsoft Windows Server version 200410.0.0 → publicationenisa_euvdEU
Microsoft Windows Server version 20H210.0.0 → publicationenisa_euvdEU
Microsoft Windows Server, version 1909 (Server Core installation)10.0.0 → publicationenisa_euvdEU
Microsoft Corp Windows 10all versionsfstec_bduRU

showing 20 of 119

advisories (1)

Vendor and ecosystem advisories describing this.

msrc_CVE-2021-26886User Profile Service Denial of Service Vulnerability2021-03-09csaf · msrc_csafUS
To determine the support lifecycle for your software, see the Microsoft Support Lifecycle: https://support.microsoft.com/lifecycle

also known as (6)

Other names and identifiers for this entity.

sources

Which sources assert this record, and when.

cnnvd enisa_euvd fstec_bdu msrc_csaf NVD CVE.org MITRE

published 2021-03-11modified 2026-08-19

references (9)

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