CVE-2021-33749

mediumpriority · track · 28EPSS 0.024 · 84 %ileEURUUS

grimoire priorityP3 · Track

Exploitable?

—

no known exploitation

Likely / severe?

2.42% (84th) EPSS

CVSS 6.8 · medium

Is it mine?

137 products

Check your exposure

Who says so?

4 sources

cnnvd · enisa_euvd · fstec_bdu · msrc_csaf

EPSS · scored 2026-10-28

Windows DNS Snap-in Remote Code Execution Vulnerability

remediations

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

A vendor fix is available.

FixedWindows 10 Version 1809 for 32-bit Systemsmsrc_csaf
10.0.17763.2061:Security Update:https://support.microsoft.com/help/5004244
https://support.microsoft.com/help/5004244
FixedWindows 10 Version 1809 for ARM64-based Systemsmsrc_csaf
10.0.17763.2061:Security Update:https://support.microsoft.com/help/5004244
https://support.microsoft.com/help/5004244
FixedWindows 10 Version 1809 for x64-based Systemsmsrc_csaf
10.0.17763.2061:Security Update:https://support.microsoft.com/help/5004244
https://support.microsoft.com/help/5004244
FixedWindows 10 Version 1909 for 32-bit Systemsmsrc_csaf
10.0.18363.1679:Security Update:https://support.microsoft.com/help/5004245
https://support.microsoft.com/help/5004245
FixedWindows 10 Version 1909 for ARM64-based Systemsmsrc_csaf
10.0.18363.1679:Security Update:https://support.microsoft.com/help/5004245
https://support.microsoft.com/help/5004245
FixedWindows 10 Version 1909 for x64-based Systemsmsrc_csaf
10.0.18363.1679:Security Update:https://support.microsoft.com/help/5004245
https://support.microsoft.com/help/5004245
FixedWindows 10 Version 2004 for 32-bit Systemsmsrc_csaf
10.0.19041.1110:Security Update:https://support.microsoft.com/help/5004237
https://support.microsoft.com/help/5004237
FixedWindows 10 Version 2004 for ARM64-based Systemsmsrc_csaf
10.0.19041.1110:Security Update:https://support.microsoft.com/help/5004237
https://support.microsoft.com/help/5004237
FixedWindows 10 Version 2004 for x64-based Systemsmsrc_csaf
10.0.19041.1110:Security Update:https://support.microsoft.com/help/5004237
https://support.microsoft.com/help/5004237
FixedWindows 10 Version 20H2 for 32-bit Systemsmsrc_csaf
10.0.19042.1110:Security Update:https://support.microsoft.com/help/5004237
https://support.microsoft.com/help/5004237
FixedWindows 10 Version 20H2 for ARM64-based Systemsmsrc_csaf
10.0.19042.1110:Security Update:https://support.microsoft.com/help/5004237
https://support.microsoft.com/help/5004237
FixedWindows 10 Version 21H1 for 32-bit Systemsmsrc_csaf
10.0.19043.1110:Security Update:https://support.microsoft.com/help/5004237
https://support.microsoft.com/help/5004237
FixedWindows 10 Version 21H1 for ARM64-based Systemsmsrc_csaf
10.0.19043.1110:Security Update:https://support.microsoft.com/help/5004237
https://support.microsoft.com/help/5004237
FixedWindows 10 Version 21H1 for x64-based Systemsmsrc_csaf
10.0.19043.1110:Security Update:https://support.microsoft.com/help/5004237
https://support.microsoft.com/help/5004237
FixedWindows 10 for 32-bit Systemsmsrc_csaf
10.0.10240.19003:Security Update:https://support.microsoft.com/help/5004249
https://support.microsoft.com/help/5004249
FixedWindows 10 for x64-based Systemsmsrc_csaf
10.0.10240.19003:Security Update:https://support.microsoft.com/help/5004249
https://support.microsoft.com/help/5004249
FixedWindows 7 for 32-bit Systems Service Pack 1msrc_csaf
6.1.7601.25661:Monthly Rollup:https://support.microsoft.com/help/5004289
https://support.microsoft.com/help/5004289
FixedWindows 7 for x64-based Systems Service Pack 1msrc_csaf
6.1.7601.25661:Monthly Rollup:https://support.microsoft.com/help/5004289
https://support.microsoft.com/help/5004289
FixedWindows 8.1 for 32-bit systemsmsrc_csaf
6.3.9600.20069:Security Only:https://support.microsoft.com/help/5004285
https://support.microsoft.com/help/5004285
FixedWindows 8.1 for x64-based systemsmsrc_csaf
6.3.9600.20069:Security Only:https://support.microsoft.com/help/5004285
https://support.microsoft.com/help/5004285
FixedWindows RT 8.1msrc_csaf
6.3.9600.20069:Monthly Rollup:https://support.microsoft.com/help/5004298
https://support.microsoft.com/help/5004298
FixedWindows Server 2008 R2 for x64-based Systems Service Pack 1msrc_csaf
6.1.7601.25661:Monthly Rollup:https://support.microsoft.com/help/5004289
https://support.microsoft.com/help/5004289
FixedWindows Server 2008 R2 for x64-based Systems Service Pack 1 (Server Core installation)msrc_csaf
6.1.7601.25661:Monthly Rollup:https://support.microsoft.com/help/5004289
https://support.microsoft.com/help/5004289
FixedWindows Server 2008 for 32-bit Systems Service Pack 2msrc_csaf
6.0.6003.21167:Security Only:https://support.microsoft.com/help/5004299
https://support.microsoft.com/help/5004299
FixedWindows Server 2008 for 32-bit Systems Service Pack 2 (Server Core installation)msrc_csaf
6.0.6003.21167:Security Only:https://support.microsoft.com/help/5004299
https://support.microsoft.com/help/5004299
FixedWindows Server 2008 for x64-based Systems Service Pack 2msrc_csaf
6.0.6003.21167:Security Only:https://support.microsoft.com/help/5004299
https://support.microsoft.com/help/5004299
FixedWindows Server 2008 for x64-based Systems Service Pack 2 (Server Core installation)msrc_csaf
6.0.6003.21167:Security Only:https://support.microsoft.com/help/5004299
https://support.microsoft.com/help/5004299
FixedWindows Server 2012msrc_csaf
6.2.9200.23409:Monthly Rollup:https://support.microsoft.com/help/5004294
https://support.microsoft.com/help/5004294
FixedWindows Server 2012 (Server Core installation)msrc_csaf
6.2.9200.23409:Monthly Rollup:https://support.microsoft.com/help/5004294
https://support.microsoft.com/help/5004294
FixedWindows Server 2012 R2msrc_csaf
6.3.9600.20069:Security Only:https://support.microsoft.com/help/5004285
https://support.microsoft.com/help/5004285
FixedWindows Server 2012 R2 (Server Core installation)msrc_csaf
6.3.9600.20069:Security Only:https://support.microsoft.com/help/5004285
https://support.microsoft.com/help/5004285
FixedWindows Server 2016msrc_csaf
10.0.14393.4530:Security Update:https://support.microsoft.com/help/5004238
https://support.microsoft.com/help/5004238
FixedWindows Server 2016 (Server Core installation)msrc_csaf
10.0.14393.4530:Security Update:https://support.microsoft.com/help/5004238
https://support.microsoft.com/help/5004238
FixedWindows Server 2019msrc_csaf
10.0.17763.2061:Security Update:https://support.microsoft.com/help/5004244
https://support.microsoft.com/help/5004244
FixedWindows Server 2019 (Server Core installation)msrc_csaf
10.0.17763.2061:Security Update:https://support.microsoft.com/help/5004244
https://support.microsoft.com/help/5004244
FixedWindows Server, version 2004 (Server Core installation)msrc_csaf
10.0.19041.1110:Security Update:https://support.microsoft.com/help/5004237
https://support.microsoft.com/help/5004237
FixedWindows Server, version 20H2 (Server Core Installation)msrc_csaf
10.0.19042.1110:Security Update:https://support.microsoft.com/help/5004237
https://support.microsoft.com/help/5004237

cvss

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

8.8

010

base score 0–10 · higher = more severe · hover a vector to decode⚠ sources disagree · medium–high · 5.8–8.8

v2.06.8mediumAV:N/AC:M/Au:N/C:P/I:P/A:Pprimary · NVD / NIST USexploitability 8.6 · impact 6.4

v2.05.8mediumAV:N/AC:M/Au:N/C:P/I:P/A:P/E:Usecondary · CVSS-BT (t0sche)

v3.18.8highAV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:Hsecondary · FSTEC (BDU) RU

v3.18.8highCVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:Hsecondary · secure@microsoft.com USexploitability 2.8 · impact 5.9

v3.18.8highCVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H/E:U/RL:O/RC:Csecondary · Microsoft Security Response Center US

v3.18.8highCVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H/E:U/RL:O/RC:Csecondary · ENISA EU

v3.18.8highCVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:Hsecondary · NVD / NIST USexploitability 2.8 · impact 5.9

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-94US

affected products (137)

Products and version ranges known to be affected.

Microsoft Windows 10 Version 150710.0.10240.0 → 10.0.10240.19003enisa_euvdEU
Microsoft Windows 10 Version 180910.0.0 → 10.0.17763.2061enisa_euvdEU
Microsoft Windows 10 Version 180910.0.17763.0 → 10.0.17763.2061enisa_euvdEU
Microsoft Windows 10 Version 190910.0.0 → 10.0.18363.1679enisa_euvdEU
Microsoft Windows 10 Version 200410.0.0 → 10.0.19041.1110enisa_euvdEU
Microsoft Windows 10 Version 20H210.0.0 → 10.0.19042.1110enisa_euvdEU
Microsoft Windows 10 Version 21H110.0.0 → 10.0.19043.1110enisa_euvdEU
Microsoft Windows 76.1.0 → 6.1.7601.25661enisa_euvdEU
Microsoft Windows 7 Service Pack 16.1.0 → 6.1.7601.25661enisa_euvdEU
Microsoft Windows 8.16.3.0 → 6.3.9600.20069enisa_euvdEU
Microsoft Windows Server 2008 R2 Service Pack 16.1.7601.0 → 6.1.7601.25661enisa_euvdEU
Microsoft Windows Server 2008 R2 Service Pack 1 (Server Core installation)6.1.7601.0 → 6.1.7601.25661enisa_euvdEU
Microsoft Windows Server 2008 Service Pack 26.0.6003.0 → 6.0.6003.21167enisa_euvdEU
Microsoft Windows Server 2008 Service Pack 2 (Server Core installation)6.0.6003.0 → 6.0.6003.21167enisa_euvdEU
Microsoft Windows Server 20126.2.9200.0 → 6.2.9200.23409enisa_euvdEU
Microsoft Windows Server 2012 (Server Core installation)6.2.9200.0 → 6.2.9200.23409enisa_euvdEU
Microsoft Windows Server 2012 R26.3.9600.0 → 6.3.9600.20069enisa_euvdEU
Microsoft Windows Server 2012 R2 (Server Core installation)6.3.9600.0 → 6.3.9600.20069enisa_euvdEU
Microsoft Windows Server 201610.0.14393.0 → 10.0.14393.4530enisa_euvdEU
Microsoft Windows Server 2016 (Server Core installation)10.0.14393.0 → 10.0.14393.4530enisa_euvdEU

showing 20 of 137

advisories (1)

Vendor and ecosystem advisories describing this.

msrc_CVE-2021-33749Windows DNS Snap-in Remote Code Execution Vulnerability2021-07-13csaf · msrc_csafUS
To determine the support lifecycle for your software, see the Microsoft Support Lifecycle: https://support.microsoft.com/lifecycle

also known as (4)

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 2021-07-14modified 2026-08-10

references (8)

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