OS Kernel information disclosure Microsoft Windows

Published: 2021-06-08 | Updated: 2021-06-27
Risk Medium
Patch available YES
Number of vulnerabilities 1
CVE ID CVE-2021-31955
Exploitation vector Local
Public exploit This vulnerability is being exploited in the wild.
Vulnerable software
Operating systems & Components / Operating system

Windows Server
Operating systems & Components / Operating system

Vendor Microsoft

Security Advisory

This security advisory describes one medium risk vulnerability.

1) Improper Privilege Management

Risk: Medium

CVSSv3.1: 5.3 [CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:N/E:H/RL:O/RC:C] [PCI]

CVE-ID: CVE-2021-31955

CWE-ID: CWE-269 - Improper Privilege Management

Exploit availability: Yes


The vulnerability allows a local user to gain access to sensitive information.

The vulnerability exists due to improper privilege management. A local unprivileged user can read contents of Kernel memory from a user mode process.

Note, the vulnerability is being actively exploited in the wild.


Install updates from vendor's website.

Vulnerable software versions

Windows: 10 20H2, 10 21H1, 10 1809, 10 1909, 10 2004

Windows Server: 2019, 2019 20H2, 2019 2004

CPE External links


Q & A

Can this vulnerability be exploited remotely?

No. This vulnerability can be exploited locally. The attacker should have authentication credentials and successfully authenticate on the system.

Is there known malware, which exploits this vulnerability?

Yes. This vulnerability is being exploited in the wild.