Is CVE-2021-3981 in the CISA KEV catalog?

No. CVE-2021-3981 is not currently on the CISA Known Exploited Vulnerabilities list.

What is the CVSS severity of CVE-2021-3981?

CVE-2021-3981 has a CVSS v3 base score of 3.3 (LOW).

What is the EPSS score for CVE-2021-3981?

CVE-2021-3981 has an EPSS score of 0.31% (23th percentile), estimating the probability of exploitation in the next 30 days.

How do I fix CVE-2021-3981?

Upgrade grub2 on debian 12 to 2.06-8 or later. Fixes are available for 11 affected products.

CVE & CISA-KEV Catalog

CVE-2021-3981

LOW

3.3

CVSS v3

NVD

Description

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.

CWE-276

How to fix

Remediation Available

grub2Debian

Fixed in:2.06-8CVE-2021-3981

grub-efi-amd64Ubuntu

Fixed in:2.06-2ubuntu14.1USN-6355-1

grub-efi-amd64-binUbuntu

Fixed in:2.06-2ubuntu14.1USN-6355-1

grub-efi-amd64-signedUbuntu

Fixed in:1.187.3~20.04.1+2.06-2ubuntu14.1USN-6355-1

Fixed in:1.187.3~22.04.1+2.06-2ubuntu14.1USN-6355-1

grub-efi-arm64Ubuntu

Fixed in:2.06-2ubuntu14.1USN-6355-1

grub-efi-arm64-binUbuntu

Fixed in:2.06-2ubuntu14.1USN-6355-1

grub-efi-arm64-signedUbuntu

Fixed in:1.187.3~20.04.1+2.06-2ubuntu14.1USN-6355-1

Fixed in:1.187.3~22.04.1+2.06-2ubuntu14.1USN-6355-1

grub2-signedUbuntu

Fixed in:1.187.3~20.04.1USN-6355-1

Fixed in:1.187.3~22.04.1USN-6355-1

grub2-unsignedUbuntu

Fixed in:2.06-2ubuntu14.1USN-6355-1

shimUbuntu

Fixed in:15.7-0ubuntu1USN-6355-1

shim-signedUbuntu

Fixed in:1.40.9USN-6355-1

Fixed in:1.51.3USN-6355-1

Remediation is compiled from vendor and distribution security advisories. Always confirm against the linked source for your exact version and platform.

CVSS v3 Vector

Exploitability

Attack VectorLocal

Attack ComplexityLow

Privileges RequiredLow

User InteractionNone

ScopeUnchanged

Impact

ConfidentialityLow

IntegrityNone

AvailabilityNone

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

Exploit Intelligence

0.31%probability of exploitation in 30 days

23rdpercentile

Low risk: more likely to be exploited than 23% of all known CVEs.

References

Patch1

bugzilla.redhat.com

Third-Party Advisory1

security.gentoo.org

Other references2

Related Vulnerabilities

Other CWE-276 vulnerabilities, ordered by exploit likelihood. View all

CVE	Severity	CVSS	EPSS	Exploited	Fix
CVE-2013-0632	Critical	9.8	94%	KEV	-
CVE-2017-11610	High	8.8	88%	-	Fix
CVE-2023-29919	Critical	9.1	60%	-	-
CVE-2019-17124	Critical	9.8	23%	-	-
CVE-2020-12608	High	7.8	22%	-	Fix
CVE-2021-3437	Critical	9.8	16%	-	Fix

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This product uses NVD data but is not endorsed or certified by the NVD. EPSS scores courtesy of FIRST.org (https://www.first.org/epss). Source: CISA KEV Catalog. Data as of 2024-11-21.