How severe is CVE-2021-34477?

CVE-2021-34477 has a CVSS 3.x base score of 7.8, rated high severity. It is exploitable over local access with low attack complexity, requires low privileges and no user interaction. Impact on confidentiality is high, integrity high, and availability high.

Is CVE-2021-34477 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (39th percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2021-34477?

CVE-2021-34477 primarily affects Microsoft .net Education Bundle Sdk Install Tool. In total, 2 product configurations (CPEs) are listed as vulnerable; see the affected-products list for the exact versions.

How do I fix CVE-2021-34477?

Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Given its high severity, prioritise patching exposed systems.

When was CVE-2021-34477 published?

CVE-2021-34477 was published on 2021-07-14 and last updated on 2026-06-17.

CVE-2021-34477

CVE-2021-34477 is a high-severity vulnerability in Microsoft .net Education Bundle Sdk Install Tool with a CVSS 3.x base score of 7.8. 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-269.

Key facts

Severity: High (CVSS 3.x base score 7.8)
CVSS v2: 4.6
EPSS exploit prediction: 0% (39th percentile)
Actively exploited: Not listed in CISA KEV
Weakness: CWE-269
Affected product: Microsoft .net Education Bundle Sdk Install Tool
Published: 2021-07-14
Last modified: 2026-06-17

Description

Visual Studio Code .NET Runtime Elevation of Privilege Vulnerability

Frequently asked questions

What is CVE-2021-34477?: Visual Studio Code .NET Runtime Elevation of Privilege Vulnerability
How severe is CVE-2021-34477?: CVE-2021-34477 has a CVSS 3.x base score of 7.8, rated high severity. It is exploitable over local access with low attack complexity, requires low privileges and no user interaction. Impact on confidentiality is high, integrity high, and availability high.
Is CVE-2021-34477 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (39th percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2021-34477?: CVE-2021-34477 primarily affects Microsoft .net Education Bundle Sdk Install Tool. In total, 2 product configurations (CPEs) are listed as vulnerable; see the affected-products list for the exact versions.
How do I fix CVE-2021-34477?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Given its high severity, prioritise patching exposed systems.
When was CVE-2021-34477 published?: CVE-2021-34477 was published on 2021-07-14 and last updated on 2026-06-17.

References

https://portal.msrc.microsoft.com/en-US/security-guidance/advisory/CVE-2021-34477

Affected products (2)

cpe:2.3:a:microsoft:.net_education_bundle_sdk_install_tool:*:*:*:*:*:visual_studio_code:*:*
cpe:2.3:a:microsoft:.net_install_tool_for_extension_authors:*:*:*:*:*:visual_studio_code:*:*

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