How severe is CVE-2021-26444?

CVE-2021-26444 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-2021-26444 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 1% (65th percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2021-26444?

CVE-2021-26444 affects Microsoft Azure Real Time Operating System. See the affected-products list for the exact vulnerable versions.

How do I fix CVE-2021-26444?

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

When was CVE-2021-26444 published?

CVE-2021-26444 was published on 2021-11-10 and last updated on 2026-06-17.

CVE-2021-26444

CVE-2021-26444 is a low-severity vulnerability in Microsoft Azure Real Time Operating System 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: 1.9
EPSS exploit prediction: 1% (65th percentile)
Actively exploited: Not listed in CISA KEV
Affected product: Microsoft Azure Real Time Operating System
Published: 2021-11-10
Last modified: 2026-06-17

Description

Azure RTOS Information Disclosure Vulnerability

Frequently asked questions

What is CVE-2021-26444?: Azure RTOS Information Disclosure Vulnerability
How severe is CVE-2021-26444?: CVE-2021-26444 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-2021-26444 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 1% (65th percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2021-26444?: CVE-2021-26444 affects Microsoft Azure Real Time Operating System. See the affected-products list for the exact vulnerable versions.
How do I fix CVE-2021-26444?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround.
When was CVE-2021-26444 published?: CVE-2021-26444 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-2021-26444

Affected products (1)

cpe:2.3:o:microsoft:azure_real_time_operating_system:*:*:*:*:*:*:*:*

More vulnerabilities in Microsoft Azure Real Time Operating System

CVE-2021-42304 — Medium (CVSS 6.6): Azure RTOS Elevation of Privilege Vulnerability
CVE-2021-42303 — Medium (CVSS 6.6): Azure RTOS Elevation of Privilege Vulnerability
CVE-2021-42302 — Medium (CVSS 6.6): Azure RTOS Elevation of Privilege Vulnerability
CVE-2021-42323 — Low (CVSS 3.3): Azure RTOS Information Disclosure Vulnerability

All CVEs affecting Microsoft Azure Real Time Operating System →