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CVE-2020-16991

24
FAUCET Score

CVE-2020-16991 describes an unsigned code execution vulnerability affecting Microsoft Azure Sphere. This high-severity flaw (CVSS 7.3) allows an attacker to execute arbitrary code with low impact to confidentiality and availability, but high impact to integrity, without requiring user interaction or privileges. Despite its severity, there is no evidence of active exploitation, and no public exploit code is available in Metasploit, Nuclei, or ExploitDB. Community discussion and media coverage are minimal, indicating limited public attention.

Impacted Technologies

VendorProductVersion(s)CPE
< 20.07CPE matchmatch criteria
cpe:2.3:a:microsoft:azure_sphere:*:*:*:*:*:*:*:*

CVSS Data

CVSS version used by this source: 3.1

7.3HIGH

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

Attack Vector
LOCAL
Attack Complexity
LOW
Privileges Required
NONE
User Interaction
NONE
Scope
UNCHANGED
Confidentiality Impact
LOW
Integrity Impact
HIGH
Availability Impact
LOW
Exploitability Score
2.5
Impact Score
4.7
CvssVersion
3.1

Exploit Intelligence

EPSS Score
1.67%
Probability of exploitation in next 30 days
EPSS Percentile
74.4%
Percentile rank of EPSS score among Peer Group
As of 2026-07-27
Model: v2026.06.15
This CVE's current EPSS score of 0.0167 is in the 90th percentile among its peer group of 3,241 CVEs.

Social Chatter

The average CVE in this peer group has 0.0 Twitter, 0.0 Reddit, 0.1 Bluesky, 0.0 Mastodon, and 0.5 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: Azure Sphere

Vendor Advisories (1)

microsoft2020-Nov/CVE-2020-16991Important

Azure Sphere Unsigned Code Execution Vulnerability

Nov 10, 2020

References

portal.msrc.microsoft.com / en-US/security-guidance/advisory/CVE-2020-16991
PatchVendor Advisory
talosintelligence.com / vulnerability_reports/TALOS-2020-1090
ExploitThird Party Advisory