Is CVE-2020-25632 in the CISA KEV catalog?

No. CVE-2020-25632 is not currently on the CISA Known Exploited Vulnerabilities list.

What is the CVSS severity of CVE-2020-25632?

CVE-2020-25632 has a CVSS v3 base score of 8.2 (HIGH).

What is the EPSS score for CVE-2020-25632?

CVE-2020-25632 has an EPSS score of 1.15% (63th percentile), estimating the probability of exploitation in the next 30 days.

How do I fix CVE-2020-25632?

Upgrade grub2 on debian 11 to 2.04-16 or later. Fixes are available for 7 affected products.

CVE & CISA-KEV Catalog

CVE-2020-25632

HIGH

8.2

CVSS v3

NVD

Description

A flaw was found in grub2 in versions prior to 2.06. The rmmod implementation allows the unloading of a module used as a dependency without checking if any other dependent module is still loaded leading to a use-after-free scenario. This could allow arbitrary code to be executed or a bypass of Secure Boot protections. The highest threat from this vulnerability is to data confidentiality and integrity as well as system availability.

CWE-416Use After Free

How to fix

Remediation Available

grub2Debian

Fixed in:2.04-16CVE-2020-25632

grub-efi-amd64-binUbuntu

Fixed in:2.04-1ubuntu44.1.2USN-4992-1

Fixed in:2.04-1ubuntu44.2USN-4992-1

grub-efi-amd64-signedUbuntu

Fixed in:1.167~18.04.5+2.04-1ubuntu44.1.2USN-4992-1

Fixed in:1.167.2+2.04-1ubuntu44.2USN-4992-1

grub-efi-arm64-binUbuntu

Fixed in:2.04-1ubuntu44.1.2USN-4992-1

Fixed in:2.04-1ubuntu44.2USN-4992-1

grub-efi-arm64-signedUbuntu

Fixed in:1.167~18.04.5+2.04-1ubuntu44.1.2USN-4992-1

Fixed in:1.167.2+2.04-1ubuntu44.2USN-4992-1

grub2-signedUbuntu

Fixed in:1.167~18.04.5USN-4992-1

Fixed in:1.167.2USN-4992-1

grub2-unsignedUbuntu

Fixed in:2.04-1ubuntu44.1.2USN-4992-1

Fixed in:2.04-1ubuntu44.2USN-4992-1

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 RequiredHigh

User InteractionNone

ScopeChanged

Impact

ConfidentialityHigh

IntegrityHigh

AvailabilityHigh

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

Exploit Intelligence

1.15%probability of exploitation in 30 days

63rdpercentile

Moderate risk: more likely to be exploited than 63% of all known CVEs.

References

Patch1

bugzilla.redhat.com

Third-Party Advisory2

Other references1

lists.fedoraproject.org

Related Vulnerabilities

Other CWE-416 (Use After Free) vulnerabilities, ordered by exploit likelihood. View all

CVE	Severity	CVSS	EPSS	Exploited	Fix
CVE-2019-0708	Critical	9.8	100%	KEV + Ransom	-
CVE-2021-31166	Critical	9.8	100%	KEV	Fix
CVE-2015-5119	Critical	9.8	99%	KEV	-
CVE-2010-3962	High	8.1	97%	KEV	-
CVE-2015-0313	Critical	9.8	96%	KEV	Fix
CVE-2017-9798	High	7.5	95%	-	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.