How severe is CVE-2021-43908?

CVE-2021-43908 has a CVSS 3.x base score of 4.3, rated medium severity. It is exploitable over network with low attack complexity, requires no privileges and user interaction. Impact on confidentiality is none, integrity low, and availability none.

Is CVE-2021-43908 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 3% (84th percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2021-43908?

CVE-2021-43908 affects Microsoft Visual Studio Code. See the affected-products list for the exact vulnerable versions.

How do I fix CVE-2021-43908?

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

When was CVE-2021-43908 published?

CVE-2021-43908 was published on 2021-12-15 and last updated on 2026-06-17.

CVE-2021-43908

CVE-2021-43908 is a medium-severity vulnerability in Microsoft Visual Studio Code with a CVSS 3.x base score of 4.3. It is not currently listed as actively exploited by CISA, and its EPSS exploit-prediction score is low.

Key facts

Severity: Medium (CVSS 3.x base score 4.3)
CVSS v2: 4.3
EPSS exploit prediction: 3% (84th percentile)
Actively exploited: Not listed in CISA KEV
Affected product: Microsoft Visual Studio Code
Published: 2021-12-15
Last modified: 2026-06-17

Description

Visual Studio Code Spoofing Vulnerability

Frequently asked questions

What is CVE-2021-43908?: Visual Studio Code Spoofing Vulnerability
How severe is CVE-2021-43908?: CVE-2021-43908 has a CVSS 3.x base score of 4.3, rated medium severity. It is exploitable over network with low attack complexity, requires no privileges and user interaction. Impact on confidentiality is none, integrity low, and availability none.
Is CVE-2021-43908 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 3% (84th percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2021-43908?: CVE-2021-43908 affects Microsoft Visual Studio Code. See the affected-products list for the exact vulnerable versions.
How do I fix CVE-2021-43908?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround.
When was CVE-2021-43908 published?: CVE-2021-43908 was published on 2021-12-15 and last updated on 2026-06-17.

References

https://portal.msrc.microsoft.com/en-US/security-guidance/advisory/CVE-2021-43908

Affected products (1)

cpe:2.3:a:microsoft:visual_studio_code:-:*:*:*:*:*:*:*

More vulnerabilities in Microsoft Visual Studio Code

CVE-2026-47281 — Critical (CVSS 9.6): Improper input validation in Visual Studio Code allows an unauthorized attacker to elevate privileges over a network.
CVE-2026-41613 — High (CVSS 8.8): Session fixation in Visual Studio Code allows an unauthorized attacker to elevate privileges over a network.
CVE-2026-41109 — High (CVSS 8.8): Improper neutralization of special elements in output used by a downstream component ('injection') in GitHub Copilot…
CVE-2026-21518 — High (CVSS 8.8): Improper neutralization of special elements used in a command ('command injection') in GitHub Copilot and Visual Studio…
CVE-2025-55319 — High (CVSS 8.8): Ai command injection in Agentic AI and Visual Studio Code allows an unauthorized attacker to execute code over a…
CVE-2024-43488 — High (CVSS 8.8): Missing authentication for critical function in Visual Studio Code extension for Arduino allows an unauthenticated…

All CVEs affecting Microsoft Visual Studio Code →