CVE-2021-36956

Local information disclosure via undisclosed mechanism

Published Sep 15, 2021 · Updated Aug 10, 2026

Information disclosure in Microsoft Azure Sphere before 21.08 allows local users with high privileges to read protected data. Microsoft has not published the affected component or the operation that exposes the data. Exploitation requires local access and high privileges on an affected device; the published impact is limited to confidentiality, with no integrity or availability loss.

CVSS severity4.4
Medium
EPSS probability0.88%
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 Azure Sphere before 21.08 allows local users with high privileges to read protected data. Microsoft has not published the affected component or the operation that exposes the data. Exploitation requires local access and high privileges on an affected device; the published impact is limited to confidentiality, with no integrity or availability loss.

The record

CVE
CVE-2021-36956
Published
Sep 15, 2021
Updated
Aug 10, 2026
Vendor
Microsoft
Product
Azure Sphere
Classifications
Unavailable
Attack vector
local
Privileges
admin

Timeline

How it unfolded

  1. Sep 15, 2021CVE publishedPublication date reported by the CVE source.
  2. Aug 10, 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=20.00 <21.08

What conditions does exploitation require?

Attack vectorlocal
Required privilegesadmin

What is affected?

Microsoft · Azure Sphereversion=20.00 <21.08

Published CVSS scores

4.4Microsoft CorporationCVSS:3.1/AV:L/AC:L/PR:H/UI:N/S:U/C:H/I:N/A:N
2.1NISTAV:L/AC:L/Au:N/C:P/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
Privilegesadmin
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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