What is CVE-2025-21264?

CVE-2025-21264 is a high-severity vulnerability in Microsoft Visual Studio Code Copilot Chat Extension, classified under Files or Directories Accessible to External Parties. CVSS score: 7.1/10. Published 2025-05-13.

How severe is CVE-2025-21264?

High severity. CVSS v3 base score is 7.1 out of 10.

Vulnerability in Microsoft Visual Studio Code Copilot Chat Extension

CVE-2025-21264

Files or directories accessible to external parties in Visual Studio Code allows an unauthorized attacker to bypass a security feature locally.

EPSS: 0.009 (75.4th percentile) — read the EPSS interpretation.

CVSS v3 metric

CVSS v3 base score 7.1 (High). Vector: CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:C/C:H/I:L/A:N/E:U/RL:O/RC:C.

Affected products

Microsoft Visual Studio Code Copilot Chat Extension — versions 0.27.0
Microsoft Visual Studio Code — versions 1.0.0

Weakness classification (CWE)

CWE-552 — Files or Directories Accessible to External Parties

References

Visual Studio Code Security Feature Bypass Vulnerability (vendor-advisory, patch)

Frequently asked questions

What is CVE-2025-21264?: CVE-2025-21264 is a high-severity vulnerability in Microsoft Visual Studio Code Copilot Chat Extension, classified under Files or Directories Accessible to External Parties. CVSS score: 7.1/10. Published 2025-05-13.
How severe is CVE-2025-21264?: High severity. CVSS v3 base score is 7.1 out of 10.