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CVE-2021-42301

19
FAUCET Score

CVE-2021-42301 describes an information disclosure vulnerability within Microsoft Azure RTOS. This medium-severity flaw (CVSS 4.6) has a physical attack vector and low attack complexity, potentially leading to high confidentiality impact without affecting integrity or availability. While not listed in CISA's KEV catalog and lacking public exploit code in Metasploit or ExploitDB, it received limited community discussion and media coverage, notably being addressed in Microsoft's November 2021 Patch Tuesday.

Impacted Technologies

VendorProductVersion(s)CPE
< 6.1.9CPE matchmatch criteria
cpe:2.3:o:microsoft:azure_rtos:*:*:*:*:*:*:*:*
>= 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

3.3LOW

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

Attack Vector
LOCAL
Attack Complexity
LOW
Privileges Required
NONE
User Interaction
REQUIRED
Scope
UNCHANGED
Confidentiality Impact
LOW
Integrity Impact
NONE
Availability Impact
NONE
Exploitability Score
1.8
Impact Score
1.4
CvssVersion
3.1

Exploit Intelligence

EPSS Score
0.90%
Probability of exploitation in next 30 days
EPSS Percentile
55.9%
Percentile rank of EPSS score among Peer Group
As of 2026-07-27
Model: v2026.06.15
This CVE's current EPSS score of 0.0090 is in the 93rd percentile among its peer group of 1,531 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-2021-42301Important

Azure RTOS Information Disclosure Vulnerability

Nov 9, 2021

References

portal.msrc.microsoft.com / en-US/security-guidance/advisory/CVE-2021-42301
PatchVendor Advisory