CVE-2021-34521

mediumpriority · track · 28EPSS 0.024 · 84 %ileEURUUS

grimoire priorityP3 · Track

Exploitable?

—

no known exploitation

Likely / severe?

2.38% (84th) EPSS

CVSS 6.8 · medium

Is it mine?

29 products

Check your exposure

Who says so?

4 sources

cnnvd · enisa_euvd · fstec_bdu · msrc_csaf

EPSS · scored 2026-10-28

Raw Image Extension Remote Code Execution Vulnerability

remediations

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

A vendor fix is available.

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 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 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.

7.8

010

base score 0–10 · higher = more severe · hover a vector to decode⚠ sources disagree · medium–high · 5.8–7.8

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)

v3.17.8highAV:L/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:Hsecondary · FSTEC (BDU) RU

v3.17.8highCVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:Hsecondary · secure@microsoft.com USexploitability 1.8 · impact 5.9

v3.17.8highCVSS:3.1/AV:L/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

v3.17.8highCVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H/E:U/RL:O/RC:Csecondary · ENISA EU

v3.17.8highCVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:Hsecondary · NVD / NIST USexploitability 1.8 · impact 5.9

weaknesses

The CWE weakness classes this flaw belongs to.

CWE-94US

affected products (29)

Products and version ranges known to be affected.

Microsoft Windows 10 Version 190910.0.0 → 10.0.18363.1679enisa_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 Server version 20H210.0.0 → 10.0.19042.1110enisa_euvdEU
Microsoft Corp Raw Image Extension≤ 1.0.41311.0fstec_bduRU
Microsoft Corp Windows 10 1909all versionsfstec_bduRU
Microsoft Corp Windows 10 20H2all versionsfstec_bduRU
Microsoft Corp Windows 10 21H1all versionsfstec_bduRU
Microsoft Corp Windows Server 20H2 (Server Core Installation)all versionsfstec_bduRU
Windows 10 Version 1909 for ARM64-based Systemsall versionsfixedmsrc_csafUS
Windows 10 Version 1909 for ARM64-based Systems< 10.0.18363.1679msrc_csafUS
Windows 10 Version 1909 for x64-based Systemsall versionsfixedmsrc_csafUS
Windows 10 Version 1909 for x64-based Systems< 10.0.18363.1679msrc_csafUS
Windows 10 Version 20H2 for 32-bit Systemsall versionsfixedmsrc_csafUS
Windows 10 Version 20H2 for 32-bit Systems< 10.0.19042.1110msrc_csafUS
Windows 10 Version 20H2 for ARM64-based Systemsall versionsfixedmsrc_csafUS
Windows 10 Version 20H2 for ARM64-based Systems< 10.0.19042.1110msrc_csafUS
Windows 10 Version 21H1 for 32-bit Systemsall versionsfixedmsrc_csafUS
Windows 10 Version 21H1 for 32-bit Systems< 10.0.19043.1110msrc_csafUS
Windows 10 Version 21H1 for ARM64-based Systemsall versionsfixedmsrc_csafUS

showing 20 of 29

advisories (1)

Vendor and ecosystem advisories describing this.

msrc_CVE-2021-34521Raw Image Extension 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

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