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Vulnerability details: VCID-ubvn-99dq-aaam
Vulnerability ID VCID-ubvn-99dq-aaam
Aliases CVE-2021-3981
Summary A flaw in grub2 was found where its configuration file, known as grub.cfg, is being created with the wrong permission set allowing non privileged users to read its content. This represents a low severity confidentiality issue, as those users can eventually read any encrypted passwords present in grub.cfg. This flaw affects grub2 2.06 and previous versions. This issue has been fixed in grub upstream but no version with the fix is currently released.
Status Published
Exploitability 0.5
Weighted Severity 3.0
Risk 1.5
Affected and Fixed Packages Package Details
Weaknesses (1)
CWE-276 Incorrect Default Permissions
System Score Found at
rhas Low https://access.redhat.com/errata/RHSA-2022:2110
cvssv3 3.3 https://access.redhat.com/hydra/rest/securitydata/cve/CVE-2021-3981.json
epss 0.00014 https://api.first.org/data/v1/epss?cve=CVE-2021-3981
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cvssv3.1 3.3 https://ftp.suse.com/pub/projects/security/yaml/suse-cvss-scores.yaml
cvssv2 2.1 https://nvd.nist.gov/vuln/detail/CVE-2021-3981
cvssv3 3.3 https://nvd.nist.gov/vuln/detail/CVE-2021-3981
cvssv3.1 3.3 https://nvd.nist.gov/vuln/detail/CVE-2021-3981
Reference id Reference type URL
https://access.redhat.com/hydra/rest/securitydata/cve/CVE-2021-3981.json
https://api.first.org/data/v1/epss?cve=CVE-2021-3981
https://bugzilla.redhat.com/show_bug.cgi?id=2024170
https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2021-3981
https://ftp.suse.com/pub/projects/security/yaml/suse-cvss-scores.yaml
https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/AI776L35DDYPCSAAJPJM3ZEQYSFZHBJX/
https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/AI776L35DDYPCSAAJPJM3ZEQYSFZHBJX/
https://security.gentoo.org/glsa/202209-12
http://www.openwall.com/lists/oss-security/2024/01/15/3
1001414 https://bugs.debian.org/cgi-bin/bugreport.cgi?bug=1001414
cpe:2.3:a:gnu:grub2:*:*:*:*:*:*:*:* https://nvd.nist.gov/vuln/search/results?adv_search=true&isCpeNameSearch=true&query=cpe:2.3:a:gnu:grub2:*:*:*:*:*:*:*:*
cpe:2.3:o:fedoraproject:fedora:34:*:*:*:*:*:*:* https://nvd.nist.gov/vuln/search/results?adv_search=true&isCpeNameSearch=true&query=cpe:2.3:o:fedoraproject:fedora:34:*:*:*:*:*:*:*
CVE-2021-3981 https://nvd.nist.gov/vuln/detail/CVE-2021-3981
RHSA-2022:2110 https://access.redhat.com/errata/RHSA-2022:2110
USN-6355-1 https://usn.ubuntu.com/6355-1/
No exploits are available.
Vector: CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:L/I:N/A:N Found at https://access.redhat.com/hydra/rest/securitydata/cve/CVE-2021-3981.json
Attack Vector (AV) Attack Complexity (AC) Privileges Required (PR) User Interaction (UI) Scope (S) Confidentiality Impact (C) Integrity Impact (I) Availability Impact (A)

network

adjacent_network

local

physical

low

high

none

low

high

none

required

unchanged

changed

high

low

none

high

low

none

high

low

none
Vector: CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:L/I:N/A:N Found at https://ftp.suse.com/pub/projects/security/yaml/suse-cvss-scores.yaml
Attack Vector (AV) Attack Complexity (AC) Privileges Required (PR) User Interaction (UI) Scope (S) Confidentiality Impact (C) Integrity Impact (I) Availability Impact (A)

network

adjacent_network

local

physical

low

high

none

low

high

none

required

unchanged

changed

high

low

none

high

low

none

high

low

none
Vector: AV:L/AC:L/Au:N/C:P/I:N/A:N Found at https://nvd.nist.gov/vuln/detail/CVE-2021-3981
Exploitability (E) Access Vector (AV) Access Complexity (AC) Authentication (Au) Confidentiality Impact (C) Integrity Impact (I) Availability Impact (A)

high

functional

unproven

proof_of_concept

not_defined

local

adjacent_network

network

high

medium

low

multiple

single

none

none

partial

complete

none

partial

complete

none

partial

complete
Vector: CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:L/I:N/A:N Found at https://nvd.nist.gov/vuln/detail/CVE-2021-3981
Attack Vector (AV) Attack Complexity (AC) Privileges Required (PR) User Interaction (UI) Scope (S) Confidentiality Impact (C) Integrity Impact (I) Availability Impact (A)

network

adjacent_network

local

physical

low

high

none

low

high

none

required

unchanged

changed

high

low

none

high

low

none

high

low

none
Vector: CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:L/I:N/A:N Found at https://nvd.nist.gov/vuln/detail/CVE-2021-3981
Attack Vector (AV) Attack Complexity (AC) Privileges Required (PR) User Interaction (UI) Scope (S) Confidentiality Impact (C) Integrity Impact (I) Availability Impact (A)

network

adjacent_network

local

physical

low

high

none

low

high

none

required

unchanged

changed

high

low

none

high

low

none

high

low

none
Exploit Prediction Scoring System (EPSS)
Percentile 0.01341
EPSS Score 0.00014
Published At April 14, 2025, 12:55 p.m.
Date Actor Action Source VulnerableCode Version
There are no relevant records.