CVE-2021-41373

Local user-data disclosure through Cloud Cache

Published Nov 10, 2021 · Updated Aug 19, 2026

Information disclosure in Microsoft FSLogix before 2.9.7979.62170 allows local users to read profile and Office-container data. The flaw exposes user settings and files redirected through Cloud Cache, but Microsoft has not published the incorrect operation that makes them accessible. Exploitation requires low-privilege local access and a deployment using Cloud Cache; no integrity or availability impact is reported.

CVSS severity5.5
Medium
EPSS probability0.81%
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 Microsoft FSLogix before 2.9.7979.62170 allows local users to read profile and Office-container data. The flaw exposes user settings and files redirected through Cloud Cache, but Microsoft has not published the incorrect operation that makes them accessible. Exploitation requires low-privilege local access and a deployment using Cloud Cache; no integrity or availability impact is reported.

The record

CVE
CVE-2021-41373
Published
Nov 10, 2021
Updated
Aug 19, 2026
Vendor
Microsoft
Product
FSLogix
Classifications
T1005
Attack vector
local
Privileges
authenticated

Timeline

How it unfolded

  1. Nov 10, 2021CVE publishedPublication date reported by the CVE source.
  2. Aug 19, 2026Record 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=2.0.0.0 <2.9.7979.62170

What conditions does exploitation require?

Attack vectorlocal
Required privilegesauthenticated

What is affected?

Microsoft · FSLogixversion=2.0.0.0 <2.9.7979.62170

Published CVSS scores

2.1NVDAV:L/AC:L/Au:N/C:P/I:N/A:N
5.0MicrosoftCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:N/E:P/RL:O/RC:C
5.5NVDCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:N
5.5MicrosoftCVSS: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

T1005Data from Local System

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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