CVE-2020-15705

Exploitation

Not assessed. CISA has not published an exploitation assessment for this record, and it is not in the KEV catalog. That is an absence of assessment, not a finding of no risk.

SSVC decision

Not assessed by CISA

EPSS probability

1.39% probability of exploitation activity in the next 30 days.

EPSS percentile

Ranks above 70.4% of scored records. A rank, not a probability.

NVD base score

6.4 (CVSS v3.x), scored by the NVD independently of the CNA.

NVD CVSS vector

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

NVD analysis status

Modified. NVD last modified this record on 2026-06-17.

Red Hat severity

Moderate. Red Hat's rating for its own products, not a CVSS rating.

Exploit-prediction scores from FIRST. Independent scoring and analysis status from the NVD. Vendor severity from Red Hat. Exploitation assessment and catalog membership from CISA.

Published

2020-07-29 17:45Z6 YR AGO

Last updated

2024-09-17 00:06Z1 YR AGO

Reserved

2020-07-14

Assigning CNA

canonical

Record state

PUBLISHED

Severity

Medium (CVSS 6.4)

CNA CVSS vector

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

Weaknesses

• CWE-347Improper Verification of Cryptographic SignatureBase
• CWE-440Expected Behavior ViolationBase

Data version

5.1

Document digest

3f7510aa47969d30f4389b14dcc339ecb9386f57230426135d793eae17f4031a

• www.eclypsium.comhttps://www.eclypsium.com/2020/07/29/theres-a-hole-in-the-boot/x_refsource_CONFIRM
• wiki.ubuntu.comhttps://wiki.ubuntu.com/SecurityTeam/KnowledgeBase/GRUB2SecureBootBypassvendor-advisoryx_refsource_UBUNTU
• ubuntu.comhttp://ubuntu.com/security/notices/USN-4432-1vendor-advisoryx_refsource_UBUNTU
• www.debian.orghttps://www.debian.org/security/2020-GRUB-UEFI-SecureBootvendor-advisoryx_refsource_DEBIAN
• portal.msrc.microsoft.comhttps://portal.msrc.microsoft.com/en-US/security-guidance/advisory/ADV200011x_refsource_CONFIRM
• access.redhat.comhttps://access.redhat.com/security/vulnerabilities/grub2bootloadervendor-advisoryx_refsource_REDHAT
• www.suse.comhttps://www.suse.com/c/suse-addresses-grub2-secure-boot-issue/vendor-advisoryx_refsource_SUSE
• www.suse.comhttps://www.suse.com/support/kb/doc/?id=000019673vendor-advisoryx_refsource_SUSE
• www.openwall.comhttps://www.openwall.com/lists/oss-security/2020/07/29/3x_refsource_CONFIRM
• lists.gnu.orghttps://lists.gnu.org/archive/html/grub-devel/2020-07/msg00034.htmlx_refsource_CONFIRM
• www.openwall.com[oss-security] 20200729 multiple secure boot grub2 and linux kernel vulnerabilitieshttp://www.openwall.com/lists/oss-security/2020/07/29/3mailing-listx_refsource_MLIST
• security.netapp.comhttps://security.netapp.com/advisory/ntap-20200731-0008/x_refsource_CONFIRM
• usn.ubuntu.comUSN-4432-1https://usn.ubuntu.com/4432-1/vendor-advisoryx_refsource_UBUNTU
• lists.opensuse.orgopenSUSE-SU-2020:1280http://lists.opensuse.org/opensuse-security-announce/2020-08/msg00067.htmlvendor-advisoryx_refsource_SUSE
• lists.opensuse.orgopenSUSE-SU-2020:1282http://lists.opensuse.org/opensuse-security-announce/2020-08/msg00069.htmlvendor-advisoryx_refsource_SUSE
• www.openwall.com[oss-security] 20210302 Multiple GRUB2 vulnerabilitieshttp://www.openwall.com/lists/oss-security/2021/03/02/3mailing-listx_refsource_MLIST
• security.gentoo.orgGLSA-202104-05https://security.gentoo.org/glsa/202104-05vendor-advisoryx_refsource_GENTOO
• www.openwall.com[oss-security] 20210916 Containers-optimized OS (COS) membership in the linux-distros listhttp://www.openwall.com/lists/oss-security/2021/09/17/2mailing-listx_refsource_MLIST
• www.openwall.com[oss-security] 20210917 Re: Containers-optimized OS (COS) membership in the linux-distros listhttp://www.openwall.com/lists/oss-security/2021/09/17/4mailing-listx_refsource_MLIST
• www.openwall.com[oss-security] 20210920 Re: Containers-optimized OS (COS) membership in the linux-distros listhttp://www.openwall.com/lists/oss-security/2021/09/21/1mailing-listx_refsource_MLIST