How severe is CVE-2020-35609?

CVE-2020-35609 has a CVSS 3.x base score of 5.5, rated medium severity. It is exploitable over local access with low attack complexity, requires low privileges and no user interaction. Impact on confidentiality is none, integrity none, and availability high.

Is CVE-2020-35609 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 1% (67th percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2020-35609?

CVE-2020-35609 affects Microsoft Azure Sphere. See the affected-products list for the exact vulnerable versions.

How do I fix CVE-2020-35609?

Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround.

When was CVE-2020-35609 published?

CVE-2020-35609 was published on 2020-12-22 and last updated on 2026-06-17.

CVE-2020-35609

CVE-2020-35609 is a medium-severity vulnerability in Microsoft Azure Sphere with a CVSS 3.x base score of 5.5. It is not currently listed as actively exploited by CISA, and its EPSS exploit-prediction score is low. The underlying weakness is classified as CWE-835.

Key facts

Severity: Medium (CVSS 3.x base score 5.5)
CVSS v2: 2.1
EPSS exploit prediction: 1% (67th percentile)
Actively exploited: Not listed in CISA KEV
Weakness: CWE-835
Affected product: Microsoft Azure Sphere
Published: 2020-12-22
Last modified: 2026-06-17

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.

Frequently asked questions

What is CVE-2020-35609?: 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.
How severe is CVE-2020-35609?: CVE-2020-35609 has a CVSS 3.x base score of 5.5, rated medium severity. It is exploitable over local access with low attack complexity, requires low privileges and no user interaction. Impact on confidentiality is none, integrity none, and availability high.
Is CVE-2020-35609 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 1% (67th percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2020-35609?: CVE-2020-35609 affects Microsoft Azure Sphere. See the affected-products list for the exact vulnerable versions.
How do I fix CVE-2020-35609?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround.
When was CVE-2020-35609 published?: CVE-2020-35609 was published on 2020-12-22 and last updated on 2026-06-17.

References

Affected products (1)

cpe:2.3:a:microsoft:azure_sphere:20.05:*:*:*:*:*:*:*

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