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Vulnerability record · CVE-2020-15705 · published 29 July 2020

CVE-2020-15705: Gnu grub2 improper verification of cryptographic signature vulnerability

Gnu · Grub2

GRUB2 fails to validate kernel signature when booted directly without shim, allowing secure boot to be bypassed. This only affects systems where the kernel signing certificate has been imported directly into the secure boot database and the GRUB image is booted directly without the use of shim. This issue affects GRUB2 version 2.04 and prior versions.

6.4 CVSS 3.1 Medium EPSS 1.4% · top 28.7% CWE-347 · Improper verification of cryptographic signature
6.4CVSS 3.1 base score, v2 4.4
1.4%EPSS exploitation probability, 30 days
NoNot in CISA KEV
14Affected product versions listed by NVD
40References
17 Jun 2026Last modified by NVD

Description

GRUB2 fails to validate kernel signature when booted directly without shim, allowing secure boot to be bypassed. This only affects systems where the kernel signing certificate has been imported directly into the secure boot database and the GRUB image is booted directly without the use of shim. This issue affects GRUB2 version 2.04 and prior versions.

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

Affected products

14 vulnerable configurations from NVD's CPE data, grouped by vendor and product.

References

LinkTags
http://lists.opensuse.org/opensuse-security-announce/2020-08/msg00067.html Mailing ListThird Party Advisory
http://lists.opensuse.org/opensuse-security-announce/2020-08/msg00069.html Mailing ListThird Party Advisory
http://ubuntu.com/security/notices/USN-4432-1 Third Party Advisory
http://www.openwall.com/lists/oss-security/2020/07/29/3 Mailing ListThird Party Advisory
http://www.openwall.com/lists/oss-security/2021/03/02/3 Mailing ListThird Party Advisory
http://www.openwall.com/lists/oss-security/2021/09/17/2 Mailing ListThird Party Advisory
http://www.openwall.com/lists/oss-security/2021/09/17/4 Mailing ListThird Party Advisory
http://www.openwall.com/lists/oss-security/2021/09/21/1 Mailing ListThird Party Advisory
https://access.redhat.com/security/vulnerabilities/grub2bootloader Third Party Advisory
https://lists.gnu.org/archive/html/grub-devel/2020-07/msg00034.html Issue TrackingVendor Advisory
https://portal.msrc.microsoft.com/en-US/security-guidance/advisory/ADV200011 PatchThird Party AdvisoryVendor Advisory
https://security.gentoo.org/glsa/202104-05 Third Party Advisory
https://security.netapp.com/advisory/ntap-20200731-0008/ Third Party Advisory
https://usn.ubuntu.com/4432-1/ Third Party Advisory
https://wiki.ubuntu.com/SecurityTeam/KnowledgeBase/GRUB2SecureBootBypass Third Party Advisory
https://www.debian.org/security/2020-GRUB-UEFI-SecureBoot Third Party Advisory
https://www.eclypsium.com/2020/07/29/theres-a-hole-in-the-boot/ Third Party Advisory
https://www.openwall.com/lists/oss-security/2020/07/29/3 Mailing ListThird Party Advisory
https://www.suse.com/c/suse-addresses-grub2-secure-boot-issue/ Third Party Advisory
https://www.suse.com/support/kb/doc/?id=000019673 Third Party Advisory
http://lists.opensuse.org/opensuse-security-announce/2020-08/msg00067.html Mailing ListThird Party Advisory
http://lists.opensuse.org/opensuse-security-announce/2020-08/msg00069.html Mailing ListThird Party Advisory
http://ubuntu.com/security/notices/USN-4432-1 Third Party Advisory
http://www.openwall.com/lists/oss-security/2020/07/29/3 Mailing ListThird Party Advisory
http://www.openwall.com/lists/oss-security/2021/03/02/3 Mailing ListThird Party Advisory
http://www.openwall.com/lists/oss-security/2021/09/17/2 Mailing ListThird Party Advisory
http://www.openwall.com/lists/oss-security/2021/09/17/4 Mailing ListThird Party Advisory
http://www.openwall.com/lists/oss-security/2021/09/21/1 Mailing ListThird Party Advisory
https://access.redhat.com/security/vulnerabilities/grub2bootloader Third Party Advisory
https://lists.gnu.org/archive/html/grub-devel/2020-07/msg00034.html Issue TrackingVendor Advisory
https://portal.msrc.microsoft.com/en-US/security-guidance/advisory/ADV200011 PatchThird Party AdvisoryVendor Advisory
https://security.gentoo.org/glsa/202104-05 Third Party Advisory
https://security.netapp.com/advisory/ntap-20200731-0008/ Third Party Advisory
https://usn.ubuntu.com/4432-1/ Third Party Advisory
https://wiki.ubuntu.com/SecurityTeam/KnowledgeBase/GRUB2SecureBootBypass Third Party Advisory
https://www.debian.org/security/2020-GRUB-UEFI-SecureBoot Third Party Advisory
https://www.eclypsium.com/2020/07/29/theres-a-hole-in-the-boot/ Third Party Advisory
https://www.openwall.com/lists/oss-security/2020/07/29/3 Mailing ListThird Party Advisory
https://www.suse.com/c/suse-addresses-grub2-secure-boot-issue/ Third Party Advisory
https://www.suse.com/support/kb/doc/?id=000019673 Third Party Advisory

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Source: NIST National Vulnerability Database (record CVE-2020-15705), CISA KEV, FIRST EPSS (scores of 2026-09-29). This page is refreshed as NVD updates the record.