CVE-2021-34480 — medium

01

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
10.0.14393.4583:Security Update:https://support.microsoft.com/help/5005043
https://support.microsoft.com/help/5005043
FixedWindows 10 Version 1607 for x64-based Systemsmsrc_csaf
10.0.14393.4583:Security Update:https://support.microsoft.com/help/5005043
https://support.microsoft.com/help/5005043
FixedWindows 10 Version 1809 for 32-bit Systemsmsrc_csaf
10.0.17763.2114:Security Update:https://support.microsoft.com/help/5005030
https://support.microsoft.com/help/5005030
FixedWindows 10 Version 1809 for ARM64-based Systemsmsrc_csaf
10.0.17763.2114:Security Update:https://support.microsoft.com/help/5005030
https://support.microsoft.com/help/5005030
FixedWindows 10 Version 1809 for x64-based Systemsmsrc_csaf
10.0.17763.2114:Security Update:https://support.microsoft.com/help/5005030
https://support.microsoft.com/help/5005030
FixedWindows 10 Version 1909 for 32-bit Systemsmsrc_csaf
10.0.18363.1734:Security Update:https://support.microsoft.com/help/5005031
https://support.microsoft.com/help/5005031
FixedWindows 10 Version 1909 for ARM64-based Systemsmsrc_csaf
10.0.18363.1734:Security Update:https://support.microsoft.com/help/5005031
https://support.microsoft.com/help/5005031
FixedWindows 10 Version 1909 for x64-based Systemsmsrc_csaf
10.0.18363.1734:Security Update:https://support.microsoft.com/help/5005031
https://support.microsoft.com/help/5005031
FixedWindows 10 Version 2004 for 32-bit Systemsmsrc_csaf
10.0.19041.1165:Security Update:https://support.microsoft.com/help/5005033
https://support.microsoft.com/help/5005033
FixedWindows 10 Version 2004 for ARM64-based Systemsmsrc_csaf
10.0.19041.1165:Security Update:https://support.microsoft.com/help/5005033
https://support.microsoft.com/help/5005033
FixedWindows 10 Version 2004 for x64-based Systemsmsrc_csaf
10.0.19041.1165:Security Update:https://support.microsoft.com/help/5005033
https://support.microsoft.com/help/5005033
FixedWindows 10 Version 20H2 for 32-bit Systemsmsrc_csaf
10.0.19042.1165:Security Update:https://support.microsoft.com/help/5005033
https://support.microsoft.com/help/5005033
FixedWindows 10 Version 20H2 for ARM64-based Systemsmsrc_csaf
10.0.19042.1165:Security Update:https://support.microsoft.com/help/5005033
https://support.microsoft.com/help/5005033
FixedWindows 10 Version 21H1 for 32-bit Systemsmsrc_csaf
10.0.19043.1165:Security Update:https://support.microsoft.com/help/5005033
https://support.microsoft.com/help/5005033
FixedWindows 10 Version 21H1 for ARM64-based Systemsmsrc_csaf
10.0.19043.1165:Security Update:https://support.microsoft.com/help/5005033
https://support.microsoft.com/help/5005033
FixedWindows 10 Version 21H1 for x64-based Systemsmsrc_csaf
10.0.19043.1165:Security Update:https://support.microsoft.com/help/5005033
https://support.microsoft.com/help/5005033
FixedWindows 10 for 32-bit Systemsmsrc_csaf
10.0.10240.19022:Security Update:https://support.microsoft.com/help/5005040
https://support.microsoft.com/help/5005040
FixedWindows 10 for x64-based Systemsmsrc_csaf
10.0.10240.19022:Security Update:https://support.microsoft.com/help/5005040
https://support.microsoft.com/help/5005040
FixedWindows 7 for 32-bit Systems Service Pack 1msrc_csaf
1.001:IE Cumulative:https://support.microsoft.com/help/5005036
https://support.microsoft.com/help/5005036
FixedWindows 7 for x64-based Systems Service Pack 1msrc_csaf
1.001:IE Cumulative:https://support.microsoft.com/help/5005036
https://support.microsoft.com/help/5005036
FixedWindows 8.1 for 32-bit systemsmsrc_csaf
1.001:IE Cumulative:https://support.microsoft.com/help/5005036
https://support.microsoft.com/help/5005036
FixedWindows 8.1 for x64-based systemsmsrc_csaf
1.001:IE Cumulative:https://support.microsoft.com/help/5005036
https://support.microsoft.com/help/5005036
FixedWindows RT 8.1msrc_csaf
6.3.9600.20094:Monthly Rollup:https://support.microsoft.com/help/5005076
https://support.microsoft.com/help/5005076
FixedWindows Server 2008 R2 for x64-based Systems Service Pack 1msrc_csaf
1.001:IE Cumulative:https://support.microsoft.com/help/5005036
https://support.microsoft.com/help/5005036
FixedWindows Server 2012msrc_csaf
1.001:IE Cumulative:https://support.microsoft.com/help/5005036
https://support.microsoft.com/help/5005036
FixedWindows Server 2012 R2msrc_csaf
1.001:IE Cumulative:https://support.microsoft.com/help/5005036
https://support.microsoft.com/help/5005036
FixedWindows Server 2016msrc_csaf
10.0.14393.4583:Security Update:https://support.microsoft.com/help/5005043
https://support.microsoft.com/help/5005043
FixedWindows Server 2019msrc_csaf
10.0.17763.2114:Security Update:https://support.microsoft.com/help/5005030
https://support.microsoft.com/help/5005030

02

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)

v3.16.8mediumAV:N/AC:H/PR:N/UI:R/S:U/C:H/I:H/A:Nsecondary · FSTEC (BDU) RU

v3.16.8mediumCVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:U/C:H/I:H/A:Nsecondary · secure@microsoft.com USexploitability 1.6 · impact 5.2

v3.16.8mediumCVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:U/C:H/I:H/A:N/E:U/RL:O/RC:Csecondary · Microsoft Security Response Center US

v3.16.8mediumCVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:U/C:H/I:H/A:N/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

03

ssvc

A stakeholder decision — act, attend, or track — from exploitation and impact.

Exploitation: none · Automatable: no · Technical Impact: totalcoordinatorcisa_ssvcUS

04

weaknesses

The CWE weakness classes this flaw belongs to.

CWE-787USprimaryCWE-119US

05

affected products (102)

Products and version ranges known to be affected.

Microsoft Windows 10 Version 150710.0.10240.0 → 10.0.10240.19022enisa_euvdEU
Microsoft Windows 10 Version 160710.0.14393.0 → 10.0.14393.4583enisa_euvdEU
Microsoft Windows 10 Version 180910.0.0 → 10.0.17763.2114enisa_euvdEU
Microsoft Windows 10 Version 180910.0.17763.0 → 10.0.17763.2114enisa_euvdEU
Microsoft Windows 10 Version 190910.0.0 → 10.0.18363.1734enisa_euvdEU
Microsoft Windows 10 Version 200410.0.0 → 10.0.19041.1165enisa_euvdEU
Microsoft Windows 10 Version 20H210.0.0 → 10.0.19042.1165enisa_euvdEU
Microsoft Windows 10 Version 21H110.0.0 → 10.0.19043.1165enisa_euvdEU
Microsoft Windows 76.1.0 → 6.1.7601.25685enisa_euvdEU
Microsoft Windows 7 Service Pack 16.1.0 → 6.1.7601.25685enisa_euvdEU
Microsoft Windows 8.16.3.0 → 6.3.9600.20094enisa_euvdEU
Microsoft Windows Server 2008 R2 Service Pack 16.1.7601.0 → 6.1.7601.25685enisa_euvdEU
Microsoft Windows Server 20126.2.9200.0 → 6.2.9200.23435enisa_euvdEU
Microsoft Windows Server 2012 R26.3.9600.0 → 6.3.9600.20094enisa_euvdEU
Microsoft Windows Server 201610.0.14393.0 → 10.0.14393.4583enisa_euvdEU
Microsoft Windows Server 201910.0.17763.0 → 10.0.17763.2114enisa_euvdEU
Microsoft Corp Windows 10all versionsfstec_bduRU
Microsoft Corp Windows 10 1607all versionsfstec_bduRU
Microsoft Corp Windows 10 1809all versionsfstec_bduRU
Microsoft Corp Windows 10 1909all versionsfstec_bduRU

showing 20 of 102

06

advisories (1)

Vendor and ecosystem advisories describing this.

msrc_CVE-2021-34480Scripting Engine Memory Corruption Vulnerability2021-08-10csaf · msrc_csafUS
To determine the support lifecycle for your software, see the Microsoft Support Lifecycle: https://support.microsoft.com/lifecycle

07

also known as (4)

Other names and identifiers for this entity.

08

sources

Which sources assert this record, and when.

cnnvd enisa_euvd fstec_bdu msrc_csaf NVD CVE.org MITRE

published 2021-08-12modified 2026-08-10

09

related (16,143)

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+16138 more

10

references (10)

External citations — patches, advisories, analysis.