CVE-2020-35609

Name: CVE-2020-35609
Creator: NVD / NIST
Published: 2020-12-22T20:15:12.427+00:00
License: https://creativecommons.org/publicdomain/zero/1.0/

MEDIUMCVSS 5.5/10EPSS 1.31%

Last modified Jun 17, 2026

CVE-2020-35609 is a medium-severity vulnerability rated 5.5/10 on the CVSS scale. A denial-of-service vulnerability exists in the asynchronous ioctl functionality of Microsoft Azure Sphere 20.05. A sequence of specially crafted ioctl calls can cause a denial of service. EPSS estimates a 1.31% chance of exploitation in the next 30 days.

Description

A denial-of-service vulnerability exists in the asynchronous ioctl functionality of Microsoft Azure Sphere 20.05. A sequence of specially crafted ioctl calls can cause a denial of service. An attacker can write shellcode to trigger this vulnerability.

Metrics

CVSS 3.1

5.5/10

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

EPSS Probability

1.31%

67.1th percentile

Probability of exploitation in the next 30 days. Learn more

Weakness Enumeration

CWE-835

Affected Software

Vendor	Product	Versions
Microsoft	Azure Sphere	20.05

References

https://talosintelligence.com/vulnerability_reports/TALOS-2020-1117Exploit, Third Party Advisory
https://www.talosintelligence.com/vulnerability_reports/TALOS-2020-1117Exploit, Third Party Advisory
https://talosintelligence.com/vulnerability_reports/TALOS-2020-1117Exploit, Third Party Advisory
https://www.talosintelligence.com/vulnerability_reports/TALOS-2020-1117Exploit, Third Party Advisory

Timeline

Published: Dec 22, 2020
Last Modified: Jun 17, 2026
Status: Modified

Frequently Asked Questions

What is CVE-2020-35609?

How severe is CVE-2020-35609?

CVE-2020-35609 has a CVSS score of 5.5/10 (MEDIUM severity). The EPSS model estimates a 1.31% probability of exploitation in the next 30 days.

How do I fix CVE-2020-35609?

Check the vendor references and advisories linked above for patched versions and mitigation guidance. You can also run a Strix scan to test if your systems are affected.

Are you affected by CVE-2020-35609?

Run a free Strix scan to check your systems for this vulnerability.

Scan your code now

Source: NVD / NIST