CVE-2021-34500

mediumpriority · track · 17EPSS 0.027 · 86 %ileEURUUS

grimoire priorityP3 · Track

Exploitable?

—

no known exploitation

Likely / severe?

2.66% (86th) EPSS

CVSS 4 · medium

Is it mine?

145 products

Check your exposure

Who says so?

4 sources

cnnvd · enisa_euvd · fstec_bdu · msrc_csaf

EPSS · scored 2026-10-28

Windows Kernel Memory Information Disclosure 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
10.0.14393.4946:Security Update:https://support.microsoft.com/help/5010359
https://support.microsoft.com/help/5010359
FixedWindows 10 Version 1607 for x64-based Systemsmsrc_csaf
10.0.14393.4946:Security Update:https://support.microsoft.com/help/5010359
https://support.microsoft.com/help/5010359
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
10.0.10240.19204:Security Update:https://support.microsoft.com/help/5010358
https://support.microsoft.com/help/5010358
FixedWindows 10 for x64-based Systemsmsrc_csaf
10.0.10240.19204:Security Update:https://support.microsoft.com/help/5010358
https://support.microsoft.com/help/5010358
FixedWindows 7 for 32-bit Systems Service Pack 1msrc_csaf
6.1.7601.25860:Monthly Rollup:https://support.microsoft.com/help/5010404
https://support.microsoft.com/help/5010404
FixedWindows 7 for x64-based Systems Service Pack 1msrc_csaf
6.1.7601.25860:Monthly Rollup:https://support.microsoft.com/help/5010404
https://support.microsoft.com/help/5010404
FixedWindows 8.1 for 32-bit systemsmsrc_csaf
6.3.9600.20269:Security Only:https://support.microsoft.com/help/5010395
https://support.microsoft.com/help/5010395
FixedWindows 8.1 for x64-based systemsmsrc_csaf
6.3.9600.20269:Security Only:https://support.microsoft.com/help/5010395
https://support.microsoft.com/help/5010395
FixedWindows RT 8.1msrc_csaf
6.3.9600.20269:Monthly Rollup:https://support.microsoft.com/help/5010419
https://support.microsoft.com/help/5010419
FixedWindows Server 2008 R2 for x64-based Systems Service Pack 1msrc_csaf
6.1.7601.25860:Monthly Rollup:https://support.microsoft.com/help/5010404
https://support.microsoft.com/help/5010404
FixedWindows Server 2008 R2 for x64-based Systems Service Pack 1 (Server Core installation)msrc_csaf
6.1.7601.25860:Monthly Rollup:https://support.microsoft.com/help/5010404
https://support.microsoft.com/help/5010404
FixedWindows Server 2008 for 32-bit Systems Service Pack 2msrc_csaf
6.0.6003.21374:Monthly Rollup:https://support.microsoft.com/help/5010384
https://support.microsoft.com/help/5010384
FixedWindows Server 2008 for 32-bit Systems Service Pack 2 (Server Core installation)msrc_csaf
6.0.6003.21374:Monthly Rollup:https://support.microsoft.com/help/5010384
https://support.microsoft.com/help/5010384
FixedWindows Server 2008 for x64-based Systems Service Pack 2msrc_csaf
6.0.6003.21374:Monthly Rollup:https://support.microsoft.com/help/5010384
https://support.microsoft.com/help/5010384
FixedWindows Server 2008 for x64-based Systems Service Pack 2 (Server Core installation)msrc_csaf
6.0.6003.21374:Monthly Rollup:https://support.microsoft.com/help/5010384
https://support.microsoft.com/help/5010384
FixedWindows Server 2012msrc_csaf
6.2.9200.23605:Monthly Rollup:https://support.microsoft.com/help/5010392
https://support.microsoft.com/help/5010392
FixedWindows Server 2012 (Server Core installation)msrc_csaf
6.2.9200.23605:Monthly Rollup:https://support.microsoft.com/help/5010392
https://support.microsoft.com/help/5010392
FixedWindows Server 2012 R2msrc_csaf
6.3.9600.20269:Security Only:https://support.microsoft.com/help/5010395
https://support.microsoft.com/help/5010395
FixedWindows Server 2012 R2 (Server Core installation)msrc_csaf
6.3.9600.20269:Security Only:https://support.microsoft.com/help/5010395
https://support.microsoft.com/help/5010395
FixedWindows Server 2016msrc_csaf
10.0.14393.4946:Security Update:https://support.microsoft.com/help/5010359
https://support.microsoft.com/help/5010359
FixedWindows Server 2016 (Server Core installation)msrc_csaf
10.0.14393.4946:Security Update:https://support.microsoft.com/help/5010359
https://support.microsoft.com/help/5010359
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.

7.7

010

base score 0–10 · higher = more severe · hover a vector to decode⚠ sources disagree · low–high · 3.4–7.7

v2.04mediumAV:N/AC:L/Au:S/C:P/I:N/A:Nprimary · NVD / NIST USexploitability 8 · impact 2.9

v2.03.4lowAV:N/AC:L/Au:S/C:P/I:N/A:N/E:Usecondary · CVSS-BT (t0sche)

v3.17.7highAV:N/AC:L/PR:L/UI:N/S:C/C:H/I:N/A:Nsecondary · FSTEC (BDU) RU

v3.16.3mediumCVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:C/C:H/I:N/A:Nsecondary · secure@microsoft.com USexploitability 1.8 · impact 4

v3.16.3mediumCVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:C/C:H/I:N/A:N/E:U/RL:O/RC:Csecondary · Microsoft Security Response Center US

v3.16.3mediumCVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:C/C:H/I:N/A:N/E:U/RL:O/RC:Csecondary · ENISA EU

v3.17.7highCVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:H/I:N/A:Nsecondary · NVD / NIST USexploitability 3.1 · impact 4

weaknesses

The CWE weakness classes this flaw belongs to.

CWE-200US

affected products (145)

Products and version ranges known to be affected.

Microsoft Windows 10 Version 150710.0.10240.0 → 10.0.10240.19204enisa_euvdEU
Microsoft Windows 10 Version 160710.0.14393.0 → 10.0.14393.4946enisa_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 → 6.1.7601.25860enisa_euvdEU
Microsoft Windows 7 Service Pack 16.1.0 → 6.1.7601.25860enisa_euvdEU
Microsoft Windows 8.16.3.0 → 6.3.9600.20269enisa_euvdEU
Microsoft Windows Server 2008 R2 Service Pack 16.1.7601.0 → 6.1.7601.25860enisa_euvdEU
Microsoft Windows Server 2008 R2 Service Pack 1 (Server Core installation)6.1.7601.0 → 6.1.7601.25860enisa_euvdEU
Microsoft Windows Server 2008 Service Pack 26.0.6003.0 → 6.0.6003.21374enisa_euvdEU
Microsoft Windows Server 2008 Service Pack 2 (Server Core installation)6.0.6003.0 → 6.0.6003.21374enisa_euvdEU
Microsoft Windows Server 20126.2.9200.0 → 6.2.9200.23605enisa_euvdEU
Microsoft Windows Server 2012 (Server Core installation)6.2.9200.0 → 6.2.9200.23605enisa_euvdEU
Microsoft Windows Server 2012 R26.3.9600.0 → 6.3.9600.20269enisa_euvdEU
Microsoft Windows Server 2012 R2 (Server Core installation)6.3.9600.0 → 6.3.9600.20269enisa_euvdEU
Microsoft Windows Server 201610.0.14393.0 → 10.0.14393.4946enisa_euvdEU

showing 20 of 145

advisories (1)

Vendor and ecosystem advisories describing this.

msrc_CVE-2021-34500Windows Kernel Memory Information Disclosure 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 (7)

External citations — patches, advisories, analysis.

scry

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