CVE-2020-15705

19

FAUCET Score

CVE-2020-15705 describes a vulnerability in GRUB2 (version 2.04 and prior) that allows a Secure Boot bypass. This occurs when the kernel signing certificate is directly imported into the Secure Boot database and GRUB2 is booted without shim, affecting various Linux distributions including Canonical, Debian, and Red Hat. With a CVSS score of 6.4 (Medium), this vulnerability requires high privileges and local access but can lead to complete compromise of confidentiality, integrity, and availability. While no public exploits or Metasploit modules are available, the vulnerability has garnered some community discussion and media coverage, though it is not currently listed on the CISA KEV catalog.

Impacted Technologies

Vendor	Product	Version(s)	CPE
		<= 2.04CPE matchmatch criteria	cpe:2.3:a:gnu:grub2::::::::
		Range not provided by sourceCPE matchmatch criteria	cpe:2.3:a:redhat:enterprise_linux_atomic_host:-:::::::*
		4.0CPE matchmatch criteria	cpe:2.3:a:redhat:openshift_container_platform:4.0:::::::*
		14.04CPE matchmatch criteria	cpe:2.3:o:canonical:ubuntu_linux:14.04::::esm:::
		16.04CPE matchmatch criteria	cpe:2.3:o:canonical:ubuntu_linux:16.04::::lts:::

CVSS Data

CVSS version used by this source: 3.1

6.4MEDIUM

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

Attack Vector

LOCAL

Attack Complexity

HIGH

Privileges Required

HIGH

User Interaction

NONE

Scope

UNCHANGED

Confidentiality Impact

HIGH

Integrity Impact

HIGH

Availability Impact

HIGH

Exploitability Score

0.5

Impact Score

5.9

CvssVersion

3.1

Exploit Intelligence

EPSS Score

1.39%

Probability of exploitation in next 30 days

EPSS Percentile

69.5%

Percentile rank of EPSS score among Peer Group

As of 2026-07-26

Model: v2026.06.15

This CVE's current EPSS score of 0.0139 is in the 97th percentile among its peer group of 418 CVEs.

Social Chatter

The average CVE in this peer group has 0.0 Twitter, 0.0 Reddit, 0.1 Bluesky, 0.0 Mastodon, and 0.1 GitHub mentions.

Media Mentions

The average CVE in this peer group has 0.1 InfoSec Media, 0.0 Vendor Blog, and 0.0 Security Researcher mentions.

Remediation

Patch Available

Vendor Patches (52)

microsoftpatch availablevia nvd_reference

microsoftpatch availablevia msrc

Product: 19184-16820Fixed in: 2.02-25

microsoftpatch availablevia msrc

Product: CBL Mariner 1.0 x64Fixed in: 2.02-25

microsoftpatch availablevia msrc

Product: CBL Mariner 1.0 ARMFixed in: 2.02-25

microsoftpatch availablevia msrc

Product: cm1 grub2 2.02-25 on CBL Mariner 1.0Fixed in: 2.02-25

redhatpatch availablevia redhat_api

Product: Red Hat Enterprise Linux 7.2 Advanced Update SupportFixed in: grub2-1:2.02-0.86.el7_2

redhatpatch availablevia redhat_api

Product: Red Hat Enterprise Linux 7.2 Advanced Update SupportFixed in: shim-0:15-8.el7

redhatpatch availablevia redhat_api

Product: Red Hat Enterprise Linux 7.2 Advanced Update SupportFixed in: shim-signed-0:15-8.el7_2

redhatpatch availablevia redhat_api

Product: Red Hat Enterprise Linux 7.3 Advanced Update SupportFixed in: grub2-1:2.02-0.86.el7

redhatpatch availablevia redhat_api

Product: Red Hat Enterprise Linux 7.3 Advanced Update SupportFixed in: shim-0:15-8.el7

redhatpatch availablevia redhat_api

Product: Red Hat Enterprise Linux 7.3 Advanced Update SupportFixed in: shim-signed-0:15-8.el7_3

redhatpatch availablevia redhat_api

Product: Red Hat Enterprise Linux 7.3 Telco Extended Update SupportFixed in: grub2-1:2.02-0.86.el7

redhatpatch availablevia redhat_api

Product: Red Hat Enterprise Linux 7.3 Telco Extended Update SupportFixed in: shim-0:15-8.el7

redhatpatch availablevia redhat_api

Product: Red Hat Enterprise Linux 7.3 Telco Extended Update SupportFixed in: shim-signed-0:15-8.el7_3

redhatpatch availablevia redhat_api

Product: Red Hat Enterprise Linux 7.3 Update Services for SAP SolutionsFixed in: grub2-1:2.02-0.86.el7

redhatpatch availablevia redhat_api

Product: Red Hat Enterprise Linux 7.3 Update Services for SAP SolutionsFixed in: shim-0:15-8.el7

redhatpatch availablevia redhat_api

Product: Red Hat Enterprise Linux 7.3 Update Services for SAP SolutionsFixed in: shim-signed-0:15-8.el7_3

redhatpatch availablevia redhat_api

Product: Red Hat Enterprise Linux 7.4 Advanced Update SupportFixed in: fwupdate-0:9-10.el7_4

redhatpatch availablevia redhat_api

Product: Red Hat Enterprise Linux 7.4 Advanced Update SupportFixed in: grub2-1:2.02-0.86.el7_4

redhatpatch availablevia redhat_api

Product: Red Hat Enterprise Linux 7.4 Advanced Update SupportFixed in: shim-0:15-8.el7

redhatpatch availablevia redhat_api

Product: Red Hat Enterprise Linux 7.4 Advanced Update SupportFixed in: shim-signed-0:15-8.el7_4

redhatpatch availablevia redhat_api

Product: Red Hat Enterprise Linux 7.4 Telco Extended Update SupportFixed in: fwupdate-0:9-10.el7_4

redhatpatch availablevia redhat_api

Product: Red Hat Enterprise Linux 7.4 Telco Extended Update SupportFixed in: grub2-1:2.02-0.86.el7_4

redhatpatch availablevia redhat_api

Product: Red Hat Enterprise Linux 7.4 Telco Extended Update SupportFixed in: shim-0:15-8.el7

redhatpatch availablevia redhat_api

Product: Red Hat Enterprise Linux 7.4 Telco Extended Update SupportFixed in: shim-signed-0:15-8.el7_4

redhatpatch availablevia redhat_api

Product: Red Hat Enterprise Linux 7.4 Update Services for SAP SolutionsFixed in: fwupdate-0:9-10.el7_4

redhatpatch availablevia redhat_api

Product: Red Hat Enterprise Linux 7.4 Update Services for SAP SolutionsFixed in: grub2-1:2.02-0.86.el7_4

redhatpatch availablevia redhat_api

Product: Red Hat Enterprise Linux 7.4 Update Services for SAP SolutionsFixed in: shim-0:15-8.el7

redhatpatch availablevia redhat_api

Product: Red Hat Enterprise Linux 7.4 Update Services for SAP SolutionsFixed in: shim-signed-0:15-8.el7_4

redhatpatch availablevia redhat_api

Product: Red Hat Enterprise Linux 7.6 Extended Update SupportFixed in: fwupdate-0:12-6.el7_6

redhatpatch availablevia redhat_api

Product: Red Hat Enterprise Linux 7.6 Extended Update SupportFixed in: grub2-1:2.02-0.86.el7_6

redhatpatch availablevia redhat_api

Product: Red Hat Enterprise Linux 7.6 Extended Update SupportFixed in: shim-0:15-8.el7

redhatpatch availablevia redhat_api

Product: Red Hat Enterprise Linux 7.6 Extended Update SupportFixed in: shim-signed-0:15-8.el7_6

redhatpatch availablevia redhat_api

Product: Red Hat Enterprise Linux 7.7 Extended Update SupportFixed in: fwupdate-0:12-6.el7_7

redhatpatch availablevia redhat_api

Product: Red Hat Enterprise Linux 7.7 Extended Update SupportFixed in: grub2-1:2.02-0.86.el7_7

redhatpatch availablevia redhat_api

Product: Red Hat Enterprise Linux 7.7 Extended Update SupportFixed in: shim-0:15-8.el7

redhatpatch availablevia redhat_api

Product: Red Hat Enterprise Linux 7.7 Extended Update SupportFixed in: shim-signed-0:15-8.el7_7

redhatpatch availablevia redhat_api

Product: Red Hat Enterprise Linux 8Fixed in: fwupd-0:1.1.4-7.el8_2

redhatpatch availablevia redhat_api

Product: Red Hat Enterprise Linux 8Fixed in: grub2-1:2.02-87.el8_2

redhatpatch availablevia redhat_api

Product: Red Hat Enterprise Linux 8Fixed in: shim-0:15-14.el8_2

redhatpatch availablevia redhat_api

Product: Red Hat Enterprise Linux 8Fixed in: shim-unsigned-x64-0:15-7.el8

redhatpatch availablevia redhat_api

Product: Red Hat Enterprise Linux 8.0 Update Services for SAP SolutionsFixed in: fwupd-0:1.1.4-2.el8_0

redhatpatch availablevia redhat_api

Product: Red Hat Enterprise Linux 8.0 Update Services for SAP SolutionsFixed in: grub2-1:2.02-87.el8_0

redhatpatch availablevia redhat_api

Product: Red Hat Enterprise Linux 8.0 Update Services for SAP SolutionsFixed in: shim-0:15-14.el8_0

redhatpatch availablevia redhat_api

Product: Red Hat Enterprise Linux 8.1 Extended Update SupportFixed in: grub2-1:2.02-87.el8_1

redhatpatch availablevia redhat_api

Product: Red Hat Enterprise Linux 8.1 Extended Update SupportFixed in: shim-0:15-14.el8_1

redhatpatch availablevia redhat_api

Product: Red Hat Enterprise Linux 8.1 Extended Update SupportFixed in: shim-unsigned-x64-0:15-7.el8

redhatpatch availablevia redhat_api

Product: Red Hat Enterprise Linux 8.1 Extended Update SupportFixed in: fwupd-0:1.1.4-2.el8_1

redhatpatch availablevia redhat_api

Product: Red Hat Enterprise Linux 7Fixed in: fwupdate-0:12-6.el7_8

redhatpatch availablevia redhat_api

Product: Red Hat Enterprise Linux 7Fixed in: grub2-1:2.02-0.86.el7_8

redhatpatch availablevia redhat_api

Product: Red Hat Enterprise Linux 7Fixed in: shim-0:15-7.el7_9

redhatpatch availablevia redhat_api

Product: Red Hat Enterprise Linux 7Fixed in: shim-signed-0:15-7.el7_8

Vendor Advisories (3)

microsoft2020-Aug/CVE-2020-15705

CVE-2020-15705

redhatCVE-2020-15705Moderate

grub2: Fail kernel validation without shim protocol

microsoft2020-Jul/CVE-2020-15705Moderate

GRUB2: avoid loading unsigned kernels when GRUB is booted directly under secureboot without shim

References

lists.opensuse.org / opensuse-security-announce/2020-08/msg00067.html

Mailing ListThird Party Advisory

lists.opensuse.org / opensuse-security-announce/2020-08/msg00069.html

Mailing ListThird Party Advisory

access.redhat.com / security/vulnerabilities/grub2bootloader

Third Party Advisory

lists.gnu.org / archive/html/grub-devel/2020-07/msg00034.html

Issue TrackingVendor Advisory

portal.msrc.microsoft.com / en-US/security-guidance/advisory/ADV200011

PatchThird Party AdvisoryVendor Advisory

security.gentoo.org / glsa/202104-05

Third Party Advisory

security.netapp.com / advisory/ntap-20200731-0008

Third Party Advisory

usn.ubuntu.com / 4432-1

Third Party Advisory

wiki.ubuntu.com / SecurityTeam/KnowledgeBase/GRUB2SecureBootBypass

Third Party Advisory

debian.org / security/2020-GRUB-UEFI-SecureBoot

Third Party Advisory

eclypsium.com / 2020/07/29/theres-a-hole-in-the-boot

Third Party Advisory

openwall.com / lists/oss-security/2020/07/29/3

Mailing ListThird Party Advisory

suse.com / c/suse-addresses-grub2-secure-boot-issue

Third Party Advisory

suse.com / support/kb/doc

Third Party Advisory

ubuntu.com / security/notices/USN-4432-1

Third Party Advisory

openwall.com / lists/oss-security/2020/07/29/3

Mailing ListThird Party Advisory

openwall.com / lists/oss-security/2021/03/02/3

Mailing ListThird Party Advisory

openwall.com / lists/oss-security/2021/09/17/2

Mailing ListThird Party Advisory

openwall.com / lists/oss-security/2021/09/17/4

Mailing ListThird Party Advisory

openwall.com / lists/oss-security/2021/09/21/1

Mailing ListThird Party Advisory