CVE-2021-31960

Protected memory disclosure through undisclosed driver flaw

Published Jun 8, 2021 · Updated Aug 3, 2024

Information disclosure in the Microsoft Windows Bind Filter Driver allows local users with low privileges to read protected memory contents. Microsoft has not published the affected driver routine, triggering input, or exact operation that exposes the data. Exploitation requires local low-privilege access and affects confidentiality only, with no reported integrity or availability effect.

CVSS severity5.5
Medium
EPSS probability0.76%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Information disclosure in the Microsoft Windows Bind Filter Driver allows local users with low privileges to read protected memory contents. Microsoft has not published the affected driver routine, triggering input, or exact operation that exposes the data. Exploitation requires local low-privilege access and affects confidentiality only, with no reported integrity or availability effect.

The record

CVE
CVE-2021-31960
Published
Jun 8, 2021
Updated
Aug 3, 2024
Vendor
Microsoft
Product
Windows 10 Version 21H1
Classifications
Unavailable
Attack vector
local
Privileges
authenticated

Timeline

How it unfolded

  1. Jun 8, 2021CVE publishedPublication date reported by the CVE source.
  2. Aug 3, 2024Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

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Is a vulnerable build present?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion=10.0.0 <10.0.19043.1052

What conditions does exploitation require?

Attack vectorlocal
Required privilegesauthenticated

What is affected?

Microsoft · Windows 10 Version 21H1version=10.0.0 <10.0.19043.1052
Microsoft · Windows Server, version 2004version=10.0.0 <10.0.19041.1052
Microsoft · Windows 10 Version 20H2version=10.0.0 <10.0.19042.1052
Microsoft · Windows Server version 20H2version=10.0.0 <10.0.19042.1052
Microsoft · Windows 10 Version 2004version=10.0.0 <10.0.19041.1052

Published CVSS scores

2.1NIST NVDAV:L/AC:L/Au:N/C:P/I:N/A:N
5.5Microsoft CorporationCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:N

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.

Daily unique IPsNo honeypot observations are available for this CVE in the selected window.

No observations available

Sep 10, 2026Sep 16, 2026
Latest reporting daySep 16, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectorlocal
Privilegesauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

No sourced classifications are available.

Public exploit references

No public exploit references are available in this record.

Labels summarize the accepted research assessment. They do not indicate a test against your environment.

Technologies

Your stack

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Your stack

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