Incorrect default permissions in GNU grub

Published: 2022-06-14
Risk Low
Patch available NO
Number of vulnerabilities 1
CVE-ID CVE-2021-3981
Exploitation vector Local
Public exploit N/A
Vulnerable software
Universal components / Libraries / Libraries used by multiple products

Vendor GNU

Security Bulletin

This security bulletin contains one low risk vulnerability.

1) Insecure Inherited Permissions

EUVDB-ID: #VU64272

Risk: Low

CVSSv3.1: 4.1 [CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:L/I:L/A:N/E:U/RL:U/RC:C]

CVE-ID: CVE-2021-3981

CWE-ID: CWE-277 - Insecure inherited permissions

Exploit availability: No


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

The vulnerability exists due to incorrect default permissions for in grub.cfg file that are set by the application. A local user with access to the system can view contents of files and directories.


Cybersecurity Help is currently unaware of any official solution to address this vulnerability.

Vulnerable software versions

grub: 1.99 - 2.06

CPE2.3 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?

No. We are not aware of malware exploiting this vulnerability.