CVE-2021-28324 — Windows SMB Information Disclosure Vulnerability

Executive Summary

None

Overview

7.5

CVSS HIGH

Important

MS Severity

Not Exploited

MS Exploit Status

More Likely

MS Exploit Likelihood

Category Information Disclosure

Released Apr 13 2021

Last Updated Apr 13 2021

Publicly Disclosed No

CISA KEV Not Listed

Known Exploits None Known

EPSS Score 0.06223 — 0.92623 percentile

NVD CVSS 7.5 HIGH — matches MSRC

CVSS Vector

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

ATTACK VECTOR

Network

ATTACK COMPLEXITY

Low

PRIVILEGES REQUIRED

None

USER INTERACTION

None

SCOPE

Unchanged

CONFIDENTIALITY

High

INTEGRITY

None

AVAILABILITY

None

EXPLOIT CODE MATURITY

Unproven

REMEDIATION LEVEL

Official Fix

REPORT CONFIDENCE

Confirmed

Temporal Score: 6.5

EPSS Score

0.06223

probability of exploitation in the next 30 days

0.92623 percentile - updated 2026-06-21

View on FIRST.org

Affected Products

8 affected products

Product	KB Article	Severity	Impact	Restart Required
Windows 10 Version 2004 for 32-bit Systems	`5001330 (Security Update)`	Important	Information Disclosure	Yes
Windows 10 Version 2004 for ARM64-based Systems	`5001330 (Security Update)`	Important	Information Disclosure	Yes
Windows 10 Version 2004 for x64-based Systems	`5001330 (Security Update)`	Important	Information Disclosure	Yes
Windows 10 Version 20H2 for 32-bit Systems	`5001330 (Security Update)`	Important	Information Disclosure	Yes
Windows 10 Version 20H2 for ARM64-based Systems	`5001330 (Security Update)`	Important	Information Disclosure	Yes
Windows 10 Version 20H2 for x64-based Systems	`5001330 (Security Update)`	Important	Information Disclosure	Yes
Windows Server, version 2004 (Server Core installation)	`5001330 (Security Update)`	Important	Information Disclosure	Yes
Windows Server, version 20H2 (Server Core Installation)	`5001330 (Security Update)`	Important	Information Disclosure	Yes

Patches

1 patch

Article	Type	Restart
`5001330`	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