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CVE-2021-42315

29
FAUCET Score

CVE-2021-42315 is a Remote Code Execution vulnerability affecting Microsoft Defender for IoT. This high-severity flaw (CVSS 8.8) allows an authenticated attacker to execute arbitrary code remotely with low attack complexity, potentially leading to full compromise of confidentiality, integrity, and availability. While it has a high FAUCET risk score, there is currently no evidence of active exploitation, public exploit code (Metasploit, Nuclei, ExploitDB), or KEV listing, though it has received some community discussion and media coverage.

Impacted Technologies

VendorProductVersion(s)CPE
< 10.5.2CPE matchmatch criteria
cpe:2.3:a:microsoft:defender_for_iot:*:*:*:*:*:*:*:*

CVSS Data

CVSS version used by this source: 3.1

8.8HIGH

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

Attack Vector
NETWORK
Attack Complexity
LOW
Privileges Required
LOW
User Interaction
NONE
Scope
UNCHANGED
Confidentiality Impact
HIGH
Integrity Impact
HIGH
Availability Impact
HIGH
Exploitability Score
2.8
Impact Score
5.9
CvssVersion
3.1

Exploit Intelligence

EPSS Score
2.17%
Probability of exploitation in next 30 days
EPSS Percentile
80.4%
Percentile rank of EPSS score among Peer Group
As of 2026-07-27
Model: v2026.06.15
This CVE's current EPSS score of 0.0217 is in the 79th percentile among its peer group of 17,844 CVEs.

Social Chatter

The average CVE in this peer group has 0.0 Twitter, 0.0 Reddit, 0.3 Bluesky, 0.1 Mastodon, and 0.2 GitHub mentions.

Media Mentions

The average CVE in this peer group has 0.1 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: Microsoft Defender for IoTFixed in: 10.5.2
View patch

Vendor Advisories (1)

microsoft2021-Dec/CVE-2021-42315Important

Microsoft Defender for IoT Remote Code Execution Vulnerability

Dec 14, 2021

References

portal.msrc.microsoft.com / en-US/security-guidance/advisory/CVE-2021-42315
PatchVendor Advisory