CVE-2021-1663

Name: CVE-2021-1663
Creator: NVD / NIST
Published: 2021-01-12T20:15:31.68+00:00
License: https://creativecommons.org/publicdomain/zero/1.0/

MEDIUMCVSS 5.5/10EPSS 1.20%

Last modified Jun 17, 2026

CVE-2021-1663 is a medium-severity vulnerability rated 5.5/10 on the CVSS scale. Windows Projected File System FS Filter Driver Information Disclosure Vulnerability. EPSS estimates a 1.20% chance of exploitation in the next 30 days.

Description

Windows Projected File System FS Filter Driver Information Disclosure Vulnerability

Metrics

CVSS 3.1

5.5/10

CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:N

EPSS Probability

1.20%

64.3th percentile

Probability of exploitation in the next 30 days. Learn more

Affected Software

Vendor	Product	Versions
Microsoft	Windows 10	20h2
Microsoft	Windows 10	2004
Microsoft	Windows Server 2016	20h2
Microsoft	Windows Server 2016	2004

References

Timeline

Published: Jan 12, 2021
Last Modified: Jun 17, 2026
Status: Modified

Frequently Asked Questions

What is CVE-2021-1663?

Windows Projected File System FS Filter Driver Information Disclosure Vulnerability

How severe is CVE-2021-1663?

CVE-2021-1663 has a CVSS score of 5.5/10 (MEDIUM severity). The EPSS model estimates a 1.20% probability of exploitation in the next 30 days.

How do I fix CVE-2021-1663?

Check the vendor references and advisories linked above for patched versions and mitigation guidance. You can also run a Strix scan to test if your systems are affected.

Are you affected by CVE-2021-1663?

Run a free Strix scan to check your systems for this vulnerability.

Scan your code now

Source: NVD / NIST