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CVE-2021-42303

23
FAUCET Score

CVE-2021-42303 is an Elevation of Privilege vulnerability affecting Microsoft Azure RTOS. With a CVSS score of 6.8 (Medium), it allows an attacker with physical access to achieve high impact on confidentiality, integrity, and availability with low attack complexity. While there is no known active exploitation, publicly available exploit code, or Metasploit/Nuclei modules, the vulnerability has received limited community discussion and media coverage.

Impacted Technologies

VendorProductVersion(s)CPE
< 6.1.9CPE matchmatch criteria
cpe:2.3:o:microsoft:azure_real_time_operating_system:*:*:*:*:*:*:*:*
>= 6.0.0, < 6.1.9CPE match
cpe:2.3:a:microsoft:azure_real_time_operating_system:*:*:*:*:*:*:*:*

CVSS Data

CVSS version used by this source: 3.1

6.6MEDIUM

CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:L/I:L/A:H

Attack Vector
LOCAL
Attack Complexity
LOW
Privileges Required
NONE
User Interaction
REQUIRED
Scope
UNCHANGED
Confidentiality Impact
LOW
Integrity Impact
LOW
Availability Impact
HIGH
Exploitability Score
1.8
Impact Score
4.7
CvssVersion
3.1

Exploit Intelligence

EPSS Score
0.70%
Probability of exploitation in next 30 days
EPSS Percentile
49.4%
Percentile rank of EPSS score among Peer Group
As of 2026-07-27
Model: v2026.06.15
This CVE's current EPSS score of 0.0070 is in the 88th percentile among its peer group of 1,532 CVEs.

Social Chatter

The average CVE in this peer group has 0.0 Twitter, 0.1 Reddit, 0.1 Bluesky, 0.0 Mastodon, and 0.1 GitHub mentions.

Media Mentions

The average CVE in this peer group has 0.2 InfoSec Media, 0.0 Vendor Blog, and 0.0 Security Researcher mentions.

Remediation

Patch Available

Vendor Patches (2)

microsoftpatch availablevia nvd_reference
View patch
microsoftpatch availablevia msrc
Product: Azure Real Time Operating SystemFixed in: 6.1.9

Vendor Advisories (1)

microsoft2021-Nov/CVE-2021-42303Important

Azure RTOS Elevation of Privilege Vulnerability

Nov 9, 2021

References

portal.msrc.microsoft.com / en-US/security-guidance/advisory/CVE-2021-42303
PatchVendor Advisory