Time-of-check Time-of-use (TOCTOU) Race Condition in Windows and Windows Server - CVE-2021-1640
Published: March 9, 2021 / Updated: April 30, 2021
Vulnerability identifier: #VU51304
CSH Severity: Low
CVSS v4.0: CVSS:4.0/AV:L/AC:L/AT:N/PR:L/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N/E:U/U:Clear
CVE-ID: CVE-2021-1640
CWE-ID: CWE-367
Exploitation vector: Local access
Exploit availability:
No public exploit available
Vendor: Microsoft
Affected software:
Windows
Windows Server
Windows
Windows Server
Detailed vulnerability description
The vulnerability allows a local user to perform a denial of service (DoS) attack.
The vulnerability exists due to a race condition within the Print Spooler service. A local user can create a directory junction and force the Print Spooler service to delete arbitrary files on the system. Successful exploitation of the vulnerability may result in denial of service.
How to mitigate CVE-2021-1640
Install updates from vendor's website.