CVE-2021-42323

Local information disclosure

Published Nov 10, 2021 · Updated Aug 19, 2026

Information disclosure in Azure RTOS 6.0.0 through 6.1.8 allows local users to read memory via USBX processing of crafted input. Microsoft has not published the specific USBX code locus or the incorrect operation that exposes memory, so the mechanism remains undisclosed. Exploitation requires local access and interaction with a device using USBX; Microsoft states ThreadX is not vulnerable in its default configuration.

CVSS severity3.3
Low
EPSS probability1.45%
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 Azure RTOS 6.0.0 through 6.1.8 allows local users to read memory via USBX processing of crafted input. Microsoft has not published the specific USBX code locus or the incorrect operation that exposes memory, so the mechanism remains undisclosed. Exploitation requires local access and interaction with a device using USBX; Microsoft states ThreadX is not vulnerable in its default configuration.

The record

CVE
CVE-2021-42323
Published
Nov 10, 2021
Updated
Aug 19, 2026
Vendor
Microsoft
Product
Azure RTOS
Classifications
Unavailable
Attack vector
local
Privileges
unauthenticated

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=6.0.0 <6.1.9

What conditions does exploitation require?

Attack vectorlocal
Required privilegesunauthenticated

What is affected?

Microsoft · Azure RTOSversion=6.0.0 <6.1.9

Published CVSS scores

2.1NISTAV:L/AC:L/Au:N/C:P/I:N/A:N
3.3Microsoft CorporationCVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:L/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
Privilegesunauthenticated
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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