CVE-2021-40454 — Rich Text Edit Control Information Disclosure Vulnerability

Executive Summary

None

Overview

5.5

CVSS MEDIUM

Important

MS Severity

Not Exploited

MS Exploit Status

Less Likely

MS Exploit Likelihood

Category Information Disclosure

Released Oct 12 2021

Last Updated Oct 12 2021

Publicly Disclosed No

CISA KEV Not Listed

Known Exploits None Known

EPSS Score 0.00487 — 0.37996 percentile

NVD CVSS 5.5 MEDIUM — matches MSRC

CVSS Vector

CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:N/E:F/RL:O/RC:C

ATTACK VECTOR

Local

ATTACK COMPLEXITY

Low

PRIVILEGES REQUIRED

Low

USER INTERACTION

None

SCOPE

Unchanged

CONFIDENTIALITY

High

INTEGRITY

None

AVAILABILITY

None

EXPLOIT CODE MATURITY

Functional

REMEDIATION LEVEL

Official Fix

REPORT CONFIDENCE

Confirmed

Temporal Score: 5.1

EPSS Score

0.00487

probability of exploitation in the next 30 days

0.37996 percentile - updated 2026-06-21

View on FIRST.org

Affected Products

42 affected products

Product	KB Article	Severity	Impact	Restart Required
Microsoft 365 Apps for Enterprise for 32-bit Systems	`Click to Run (Security Update)`	Important	Information Disclosure	No
Microsoft 365 Apps for Enterprise for 64-bit Systems	`Click to Run (Security Update)`	Important	Information Disclosure	No
Microsoft Office 2013 RT Service Pack 1	`4018332 (Security Update)`	Important	Information Disclosure	Maybe
Microsoft Office 2013 Service Pack 1 (32-bit editions)	`4018332 (Security Update)`	Important	Information Disclosure	Maybe
Microsoft Office 2013 Service Pack 1 (64-bit editions)	`4018332 (Security Update)`	Important	Information Disclosure	Maybe
Microsoft Office 2016 (32-bit edition)	`4461476 (Security Update)`	Important	Information Disclosure	Maybe
Microsoft Office 2016 (64-bit edition)	`4461476 (Security Update)`	Important	Information Disclosure	Maybe
Microsoft Office 2019 for 32-bit editions	`Click to Run (Security Update)`	Important	Information Disclosure	No
Microsoft Office 2019 for 64-bit editions	`Click to Run (Security Update)`	Important	Information Disclosure	No
Microsoft Office 2019 for Mac	`Release Notes (Security Update)`	Important	Information Disclosure	Maybe
Microsoft Office LTSC 2021 for 32-bit editions	`Click to Run (Security Update)`	Important	Information Disclosure	No
Microsoft Office LTSC 2021 for 64-bit editions	`Click to Run (Security Update)`	Important	Information Disclosure	No
Microsoft Office LTSC for Mac 2021	`Release Notes (Security Update)`	Important	Information Disclosure	Maybe
Windows 10 for 32-bit Systems	`5006675 (Security Update)`	Important	Information Disclosure	Yes
Windows 10 for x64-based Systems	`5006675 (Security Update)`	Important	Information Disclosure	Yes
Windows 10 Version 1607 for 32-bit Systems	`5006669 (Security Update)`	Important	Information Disclosure	Yes
Windows 10 Version 1607 for x64-based Systems	`5006669 (Security Update)`	Important	Information Disclosure	Yes
Windows 10 Version 1809 for 32-bit Systems	`5006672 (Security Update)`	Important	Information Disclosure	Yes
Windows 10 Version 1809 for ARM64-based Systems	`5006672 (Security Update)`	Important	Information Disclosure	Yes
Windows 10 Version 1809 for x64-based Systems	`5006672 (Security Update)`	Important	Information Disclosure	Yes
Windows 10 Version 1909 for 32-bit Systems	`5006667 (Security Update)`	Important	Information Disclosure	Yes
Windows 10 Version 1909 for ARM64-based Systems	`5006667 (Security Update)`	Important	Information Disclosure	Yes
Windows 10 Version 1909 for x64-based Systems	`5006667 (Security Update)`	Important	Information Disclosure	Yes
Windows 10 Version 2004 for 32-bit Systems	`5006670 (Security Update)`	Important	Information Disclosure	Yes
Windows 10 Version 2004 for ARM64-based Systems	`5006670 (Security Update)`	Important	Information Disclosure	Yes
Windows 10 Version 2004 for x64-based Systems	`5006670 (Security Update)`	Important	Information Disclosure	Yes
Windows 10 Version 20H2 for 32-bit Systems	`5006670 (Security Update)`	Important	Information Disclosure	Yes
Windows 10 Version 20H2 for ARM64-based Systems	`5006670 (Security Update)`	Important	Information Disclosure	Yes
Windows 10 Version 21H1 for 32-bit Systems	`5006670 (Security Update)`	Important	Information Disclosure	Yes
Windows 10 Version 21H1 for ARM64-based Systems	`5006670 (Security Update)`	Important	Information Disclosure	Yes
Windows 10 Version 21H1 for x64-based Systems	`5006670 (Security Update)`	Important	Information Disclosure	Yes
Windows 11 version 21H2 for ARM64-based Systems	`5006674 (Security Update)`	Important	Information Disclosure	Yes
Windows 11 version 21H2 for x64-based Systems	`5006674 (Security Update)`	Important	Information Disclosure	Yes
Windows 8.1 for 32-bit systems 5006714 (Monthly Rollup) 5006729 (Security Only) Important Information Disclosure 5005613 Base: 5.5 Temporal: 5.1 Vector: CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:N/E:F/RL:O/RC:C 6.3.9600.20144 Yes 5006714 5006729 Windows 8.1 for x64-based systems 5006714 (Monthly Rollup) 5006729 (Security Only) Important Information Disclosure 5005613 Base: 5.5 Temporal: 5.1 Vector: CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:N/E:F/RL:O/RC:C 6.3.9600.20144 Yes 5006714 5006729 Windows RT 8.1	`5006714 (Monthly Rollup)`	Important	Information Disclosure	Yes
Windows Server 2012 5006739 (Monthly Rollup) 5006732 (Security Only) Important Information Disclosure 5005623 Base: 5.5 Temporal: 5.1 Vector: CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:N/E:F/RL:O/RC:C 6.2.9200.23490 Yes 5006739 5006732 Windows Server 2012 (Server Core installation) 5006739 (Monthly Rollup) 5006732 (Security Only) Important Information Disclosure 5005623 Base: 5.5 Temporal: 5.1 Vector: CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:N/E:F/RL:O/RC:C 6.2.9200.23490 Yes 5006739 5006732 Windows Server 2012 R2 5006714 (Monthly Rollup) 5006729 (Security Only) Important Information Disclosure 5005613 Base: 5.5 Temporal: 5.1 Vector: CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:N/E:F/RL:O/RC:C 6.3.9600.20144 Yes 5006714 5006729 Windows Server 2012 R2 (Server Core installation) 5006714 (Monthly Rollup) 5006729 (Security Only) Important Information Disclosure 5005613 Base: 5.5 Temporal: 5.1 Vector: CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:N/E:F/RL:O/RC:C 6.3.9600.20144 Yes 5006714 5006729 Windows Server 2016	`5006669 (Security Update)`	Important	Information Disclosure	Yes
Windows Server 2016 (Server Core installation)	`5006669 (Security Update)`	Important	Information Disclosure	Yes
Windows Server 2019	`5006672 (Security Update)`	Important	Information Disclosure	Yes
Windows Server 2019 (Server Core installation)	`5006672 (Security Update)`	Important	Information Disclosure	Yes
Windows Server 2022	`5006699 (Security Update)`	Important	Information Disclosure	Yes
Windows Server 2022 (Server Core installation)	`5006699 (Security Update)`	Important	Information Disclosure	Yes
Windows Server, version 2004 (Server Core installation)	`5006670 (Security Update)`	Important	Information Disclosure	Yes
Windows Server, version 20H2 (Server Core Installation)	`5006670 (Security Update)`	Important	Information Disclosure	Yes

Patches

12 patches

Article	Type	Restart
`Click to Run`	Security Update	No
`4018332`	Security Update	Maybe
`4461476`	Security Update	Maybe
`Release Notes`	Security Update	Maybe
`5006675`	Security Update	Yes
`5006669`	Security Update	Yes
`5006672`	Security Update	Yes
`5006667`	Security Update	Yes
`5006670`	Security Update	Yes
`5006674`	Security Update	Yes
`5006714`	Monthly Rollup	Yes
`5006699`	Security Update	Yes

Known Exploits

No known exploits have been linked for this CVE yet. When available, exploit references will be sourced from public repositories and may be unverified, incomplete, or non-functional. Always review code carefully before use in any environment.

Acknowledgments

None

References

MSRC Advisory MITRE NVD