Is CVE-2020-27779 in the CISA KEV catalog?

No. CVE-2020-27779 is not currently on the CISA Known Exploited Vulnerabilities list.

What is the CVSS severity of CVE-2020-27779?

CVE-2020-27779 has a CVSS v3 base score of 7.5 (HIGH).

What is the EPSS score for CVE-2020-27779?

CVE-2020-27779 has an EPSS score of 0.39% (31th percentile), estimating the probability of exploitation in the next 30 days.

How do I fix CVE-2020-27779?

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

CVE & CISA-KEV Catalog

CVE-2020-27779

HIGH

7.5

CVSS v3

NVD

Description

A flaw was found in grub2 in versions prior to 2.06. The cutmem command does not honor secure boot locking allowing an privileged attacker to remove address ranges from memory creating an opportunity to circumvent SecureBoot protections after proper triage about grub's memory layout. The highest threat from this vulnerability is to data confidentiality and integrity as well as system availability.

CWE-285

How to fix

Remediation Available

grub2Debian

Fixed in:2.04-16CVE-2020-27779

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 ComplexityHigh

Privileges RequiredHigh

User InteractionNone

ScopeChanged

Impact

ConfidentialityHigh

IntegrityHigh

AvailabilityHigh

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

Exploit Intelligence

0.39%probability of exploitation in 30 days

31stpercentile

Low risk: more likely to be exploited than 31% of all known CVEs.

References

Third-Party Advisory3

Other references1

lists.fedoraproject.org

Related Vulnerabilities

Other CWE-285 vulnerabilities, ordered by exploit likelihood. View all

CVE	Severity	CVSS	EPSS	Exploited	Fix
CVE-2025-29927	Critical	9.1	100%	-	Fix
CVE-2021-28799	Critical	10.0	78%	KEV + Ransom	Fix
CVE-2023-32707	High	8.8	74%	-	Fix
CVE-2023-48241	High	7.5	73%	-	Fix
CVE-2023-22480	High	7.3	67%	-	Fix
CVE-2022-3229	Critical	9.8	66%	-	-

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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.