How severe is CVE-2021-42301?

CVE-2021-42301 has a CVSS 3.x base score of 3.3, rated low severity. It is exploitable over local access with low attack complexity, requires no privileges and user interaction. Impact on confidentiality is low, integrity none, and availability none.

Is CVE-2021-42301 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 1% (55th percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2021-42301?

CVE-2021-42301 affects Microsoft Azure Rtos. See the affected-products list for the exact vulnerable versions.

How do I fix CVE-2021-42301?

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

When was CVE-2021-42301 published?

CVE-2021-42301 was published on 2021-11-10 and last updated on 2026-06-17.

CVE-2021-42301

CVE-2021-42301 is a low-severity vulnerability in Microsoft Azure Rtos with a CVSS 3.x base score of 3.3. It is not currently listed as actively exploited by CISA, and its EPSS exploit-prediction score is low.

Key facts

Severity: Low (CVSS 3.x base score 3.3)
CVSS v2: 2.1
EPSS exploit prediction: 1% (55th percentile)
Actively exploited: Not listed in CISA KEV
Affected product: Microsoft Azure Rtos
Published: 2021-11-10
Last modified: 2026-06-17

Description

Azure RTOS Information Disclosure Vulnerability

Frequently asked questions

What is CVE-2021-42301?: Azure RTOS Information Disclosure Vulnerability
How severe is CVE-2021-42301?: CVE-2021-42301 has a CVSS 3.x base score of 3.3, rated low severity. It is exploitable over local access with low attack complexity, requires no privileges and user interaction. Impact on confidentiality is low, integrity none, and availability none.
Is CVE-2021-42301 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 1% (55th percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2021-42301?: CVE-2021-42301 affects Microsoft Azure Rtos. See the affected-products list for the exact vulnerable versions.
How do I fix CVE-2021-42301?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround.
When was CVE-2021-42301 published?: CVE-2021-42301 was published on 2021-11-10 and last updated on 2026-06-17.

References

https://portal.msrc.microsoft.com/en-US/security-guidance/advisory/CVE-2021-42301

Affected products (1)

cpe:2.3:o:microsoft:azure_rtos:*:*:*:*:*:*:*:*