CVE-2021-42302

highpriority · track · 29EPSS 0.007 · 53 %ileEURUUS

grimoire priorityP2 · Scheduled

Exploitable?

—

no known exploitation

Likely / severe?

0.69% (53rd) EPSS

CVSS 7.2 · high

Is it mine?

5 products

Check your exposure

Who says so?

5 sources

cnnvd · enisa_euvd · fstec_bdu · msrc_csaf

EPSS · scored 2026-10-28

Azure RTOS Elevation of Privilege Vulnerability

remediations

Vendor fix, mitigation, or workaround guidance, as published by each source.

A vendor fix is available.

FixedAzure Real Time Operating Systemmsrc_csaf
6.1.9:Security Update:https://azure.microsoft.com/en-us/services/rtos
https://azure.microsoft.com/en-us/services/rtos

cvss

Technical severity, 0–10. One row per scoring source.

7.2

010

base score 0–10 · higher = more severe · hover a vector to decode⚠ sources disagree · medium–high · 6.1–7.2

v2.07.2highAV:L/AC:L/Au:N/C:C/I:C/A:Cprimary · NVD / NIST USexploitability 3.9 · impact 10

v2.06.1mediumAV:L/AC:L/Au:N/C:C/I:C/A:C/E:Usecondary · CVSS-BT (t0sche)

v3.16.8mediumAV:P/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:Hsecondary · FSTEC (BDU) RU

v3.16.6mediumCVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:L/I:L/A:Hsecondary · secure@microsoft.com USexploitability 1.8 · impact 4.7

v3.16.6mediumCVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:L/I:L/A:H/E:U/RL:O/RC:Csecondary · Microsoft Security Response Center US

v3.16.6mediumCVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:L/I:L/A:H/E:U/RL:O/RC:Csecondary · ENISA EU

v3.16.8mediumCVSS:3.1/AV:P/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:Hsecondary · NVD / NIST USexploitability 0.9 · impact 5.9

weaknesses

The CWE weakness classes this flaw belongs to.

CWE-269USprimaryCWE-269US

affected products (5)

Products and version ranges known to be affected.

Microsoft Azure Real Time Operating System6.0.0 → 6.1.9enisa_euvdEU
Microsoft Corp Azure RTOS≤ 6.1.9fstec_bduRU
Azure Real Time Operating Systemall versionsfixedmsrc_csafUS
Azure Real Time Operating System< 6.1.9msrc_csafUS
microsoft azure real time operating system< 6.1.9nvdUScpe:2.3:o:microsoft:azure_real_time_operating_system:*:*:*:*:*:*:*:*

advisories (1)

Vendor and ecosystem advisories describing this.

msrc_CVE-2021-42302Azure RTOS Elevation of Privilege Vulnerability2021-11-09csaf · msrc_csafUS
To determine the support lifecycle for your software, see the Microsoft Support Lifecycle: https://support.microsoft.com/lifecycle

also known as (4)

Other names and identifiers for this entity.

sources

Which sources assert this record, and when.

cnnvd enisa_euvd fstec_bdu msrc_csaf nvd NVD CVE.org MITRE

published 2021-11-10modified 2026-08-19

related (6,665)

Related entries.

ID	severity	EPSS	exploitable	published
CVE-2026-102490US	high7.8OT critical	0.86% (58th)	KEV	2026-09-30
Zammad packages built with packager.io (DEB and RPM) could have allowed a local attacker who already had file system write privileges as the unprivileged zammad service account to…
CVE-2026-84869US	—OT critical	0.92% (60th)	KEV	2026-09-08
A condition in the ScreenConnect client may allow files to be transferred and executed through an active remote session without authorization or Host confirmation in certain circum…
CVE-2026-46817US	—OT critical	12.3% (96th)	KEV	2026-05-28
Vulnerability in the Oracle Payments product of Oracle E-Business Suite (component: File Transmission). Supported versions that are affected are 12.2.3-12.2.15. Easily exploitable…
CVE-2026-21533US	—OT critical	4.18% (91st)	KEV	2026-02-10
Improper privilege management in Windows Remote Desktop allows an authorized attacker to elevate privileges locally.
CVE-2024-57726US	critical9.9OT critical	66.4% (99th)	KEV	2025-01-15
SimpleHelp remote support software v5.5.7 and before has a vulnerability that allows low-privileges technicians to create API keys with excessive permissions. These API keys can be…

+6660 more

references (7)

External citations — patches, advisories, analysis.

scry

Attackers weaponise vulnerabilities like this against internet-exposed services. See what is exposed on your perimeter with a free passive scan.

Free scan