Is CVE-2020-14311 in the CISA KEV catalog?

No. CVE-2020-14311 is not currently on the CISA Known Exploited Vulnerabilities list.

What is the CVSS severity of CVE-2020-14311?

CVE-2020-14311 has a CVSS v3 base score of 5.7 (MEDIUM).

What is the EPSS score for CVE-2020-14311?

CVE-2020-14311 has an EPSS score of 0.46% (37th percentile), estimating the probability of exploitation in the next 30 days.

How do I fix CVE-2020-14311?

Upgrade grub2 on debian 11 to 2.04-9 or later. Fixes are available for 9 affected products.

CVE & CISA-KEV Catalog

CVE-2020-14311

MEDIUM

5.7

CVSS v3

NVD

Description

There is an issue with grub2 before version 2.06 while handling symlink on ext filesystems. A filesystem containing a symbolic link with an inode size of UINT32_MAX causes an arithmetic overflow leading to a zero-sized memory allocation with subsequent heap-based buffer overflow.

CWE-122Heap-based Buffer Overflow CWE-190Integer Overflow

How to fix

Remediation Available

grub2Debian

Fixed in:2.04-9CVE-2020-14311

grub-efi-amd64-binUbuntu

Fixed in:2.02~beta2-9ubuntu1.20USN-4432-1

Fixed in:2.02~beta2-36ubuntu3.26USN-4432-1

Fixed in:2.02-2ubuntu8.16USN-4432-1

Fixed in:2.04-1ubuntu26.1USN-4432-1

grub-efi-amd64-signedUbuntu

Fixed in:1.34.22+2.02~beta2-9ubuntu1.20USN-4432-1

Fixed in:1.66.26+2.02~beta2-36ubuntu3.26USN-4432-1

Fixed in:1.93.18+2.02-2ubuntu8.16USN-4432-1

Fixed in:1.142.3+2.04-1ubuntu26.1USN-4432-1

grub-efi-arm-binUbuntu

Fixed in:2.02~beta2-9ubuntu1.20USN-4432-1

Fixed in:2.02~beta2-36ubuntu3.26USN-4432-1

Fixed in:2.02-2ubuntu8.16USN-4432-1

Fixed in:2.04-1ubuntu26.1USN-4432-1

grub-efi-arm64-binUbuntu

Fixed in:2.02~beta2-9ubuntu1.20USN-4432-1

Fixed in:2.02~beta2-36ubuntu3.26USN-4432-1

Fixed in:2.02-2ubuntu8.16USN-4432-1

Fixed in:2.04-1ubuntu26.1USN-4432-1

grub-efi-arm64-signedUbuntu

Fixed in:1.66.26+2.02~beta2-36ubuntu3.26USN-4432-1

Fixed in:1.93.18+2.02-2ubuntu8.16USN-4432-1

Fixed in:1.142.3+2.04-1ubuntu26.1USN-4432-1

grub-efi-ia32-binUbuntu

Fixed in:2.02~beta2-9ubuntu1.20USN-4432-1

Fixed in:2.02~beta2-36ubuntu3.26USN-4432-1

Fixed in:2.02-2ubuntu8.16USN-4432-1

Fixed in:2.04-1ubuntu26.1USN-4432-1

grub2Ubuntu

Fixed in:2.02~beta2-9ubuntu1.20USN-4432-1

Fixed in:2.02~beta2-36ubuntu3.26USN-4432-1

Fixed in:2.02-2ubuntu8.16USN-4432-1

Fixed in:2.04-1ubuntu26.1USN-4432-1

grub2-signedUbuntu

Fixed in:1.34.22USN-4432-1

Fixed in:1.66.26USN-4432-1

Fixed in:1.93.18USN-4432-1

Fixed in:1.142.3USN-4432-1

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 ComplexityHigh

Privileges RequiredHigh

User InteractionNone

ScopeUnchanged

Impact

ConfidentialityNone

IntegrityHigh

AvailabilityHigh

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

Exploit Intelligence

0.46%probability of exploitation in 30 days

37thpercentile

Low risk: more likely to be exploited than 37% of all known CVEs.

References

Third-Party Advisory8

Related Vulnerabilities

Other CWE-122 (Heap-based Buffer Overflow) vulnerabilities, ordered by exploit likelihood. View all

CVE	Severity	CVSS	EPSS	Exploited	Fix
CVE-2015-3113	Critical	9.8	100%	KEV	Fix
CVE-2024-26256	High	7.8	88%	-	Fix
CVE-2020-25687	Medium	5.9	87%	-	Fix
CVE-2009-3459	High	8.8	86%	KEV	Fix
CVE-2021-21017	High	8.8	86%	KEV	-
CVE-2020-25683	Medium	5.9	86%	-	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.