Vulnerability DatabaseCVE-2020-15706
Mend.io Vulnerability Database
The largest open source vulnerability database
What is a Vulnerability ID?
New vulnerability? Tell us about it!
CVE-2020-15706
Published:July 29, 2020
Updated:May 17, 2026
GRUB2 contains a race condition in grub_script_function_create() leading to a use-after-free vulnerability which can be triggered by redefining a function whilst the same function is already executing, leading to arbitrary code execution and secure boot restriction bypass. This issue affects GRUB2 version 2.04 and prior versions.
Affected Packages
grub (YOCTO):
Affected version(s) >=2.04+2.06~rc1 <=2.06
Fix Suggestion:
Update to version no_fix
grub-efi (YOCTO):
Affected version(s) >=2.04+2.06~rc1 <=2.06
Fix Suggestion:
Update to version no_fix
Related Resources (18)
https://security.gentoo.org/glsa/202104-05
http://lists.opensuse.org/opensuse-security-announce/2020-08/msg00017.html
https://www.suse.com/c/suse-addresses-grub2-secure-boot-issue/
http://lists.opensuse.org/opensuse-security-announce/2020-08/msg00016.html
https://www.debian.org/security/2020-GRUB-UEFI-SecureBoot
https://portal.msrc.microsoft.com/en-US/security-guidance/advisory/ADV200011
https://usn.ubuntu.com/4432-1/
http://ubuntu.com/security/notices/USN-4432-1
https://lists.gnu.org/archive/html/grub-devel/2020-07/msg00034.html
https://www.debian.org/security/2020/dsa-4735
https://wiki.ubuntu.com/SecurityTeam/KnowledgeBase/GRUB2SecureBootBypass
https://security.netapp.com/advisory/ntap-20200731-0008/
https://www.eclypsium.com/2020/07/29/theres-a-hole-in-the-boot/
https://www.suse.com/support/kb/doc/?id=000019673
http://www.openwall.com/lists/oss-security/2020/07/29/3
https://access.redhat.com/security/vulnerabilities/grub2bootloader
https://www.openwall.com/lists/oss-security/2020/07/29/3
https://access.redhat.com/security/cve/CVE-2020-15706
Do you need more information?
Contact Us
CVSS v4
Base Score:
7.1
Attack Vector
LOCAL
Attack Complexity
HIGH
Attack Requirements
NONE
Privileges Required
HIGH
User Interaction
NONE
Vulnerable System Confidentiality
HIGH
Vulnerable System Integrity
HIGH
Vulnerable System Availability
HIGH
Subsequent System Confidentiality
NONE
Subsequent System Integrity
NONE
Subsequent System Availability
NONE
CVSS v3
Base Score:
6.4
Attack Vector
LOCAL
Attack Complexity
HIGH
Privileges Required
HIGH
User Interaction
NONE
Scope
UNCHANGED
Confidentiality
HIGH
Integrity
HIGH
Availability
HIGH
Weakness Type (CWE)
Use After Free
CWE-416
Concurrent Execution using Shared Resource with Improper Synchronization ('Race Condition')
CWE-362
EPSS
Base Score:
0.05