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CVE-2021-43882

31
FAUCET Score

CVE-2021-43882 is a critical Remote Code Execution vulnerability affecting Microsoft Defender for IoT. With a CVSS score of 9.8, it allows unauthenticated attackers to execute arbitrary code over the network with low complexity, leading to complete compromise of confidentiality, integrity, and availability. While not currently listed in CISA's KEV catalog and lacking public exploit code, its high FAUCET Risk Score and mention in media coverage indicate significant potential impact. Community discussion is minimal, suggesting limited public awareness of its exploitability.

Impacted Technologies

VendorProductVersion(s)CPE
< 10.5.3CPE matchmatch criteria
cpe:2.3:a:microsoft:defender_for_iot:*:*:*:*:*:*:*:*

CVSS Data

CVSS version used by this source: 3.1

9.0CRITICAL

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

Attack Vector
ADJACENT_NETWORK
Attack Complexity
LOW
Privileges Required
LOW
User Interaction
NONE
Scope
CHANGED
Confidentiality Impact
HIGH
Integrity Impact
HIGH
Availability Impact
HIGH
Exploitability Score
2.3
Impact Score
6.0
CvssVersion
3.1

Exploit Intelligence

EPSS Score
2.42%
Probability of exploitation in next 30 days
EPSS Percentile
82.4%
Percentile rank of EPSS score among Peer Group
As of 2026-07-27
Model: v2026.06.15
This CVE's current EPSS score of 0.0242 is in the 72nd percentile among its peer group of 36,862 CVEs.

Social Chatter

The average CVE in this peer group has 0.0 Twitter, 0.1 Reddit, 0.3 Bluesky, 0.3 Mastodon, and 2.4 GitHub mentions.

Media Mentions

The average CVE in this peer group has 0.3 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: 10.5.3
View patch

Vendor Advisories (1)

microsoft2021-Dec/CVE-2021-43882Important

Microsoft Defender for IoT Remote Code Execution Vulnerability

Dec 14, 2021

References

portal.msrc.microsoft.com / en-US/security-guidance/advisory/CVE-2021-43882
PatchVendor Advisory
zerodayinitiative.com / advisories/ZDI-21-1553
Third Party AdvisoryVDB Entry