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CVE-2021-42304

23
FAUCET Score

CVE-2021-42304 is an Elevation of Privilege vulnerability affecting Microsoft Azure RTOS. With a CVSS score of 6.8 (MEDIUM), this vulnerability has a physical attack vector with low complexity, allowing an attacker to achieve high confidentiality, integrity, and availability impact. While not currently on the KEV catalog or Hot List, and lacking public exploit code, it has received some community discussion and media coverage, indicating awareness of its existence.

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
0.57%
Probability of exploitation in next 30 days
EPSS Percentile
43.6%
Percentile rank of EPSS score among Peer Group
As of 2026-07-27
Model: v2026.06.15
This CVE's current EPSS score of 0.0057 is in the 82nd 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-2021-42304Important

Azure RTOS Elevation of Privilege Vulnerability

Nov 9, 2021

References

portal.msrc.microsoft.com / en-US/security-guidance/advisory/CVE-2021-42304
PatchVendor Advisory