{"cve":"CVE-2020-15705","nvd":{"published":"2020-07-29T18:15:14.187","modified":"2026-06-17T02:57:05.267","status":"Modified","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_v4":null,"cvss_v3":{"version":"3.1","vector":"CVSS:3.1/AV:L/AC:H/PR:H/UI:N/S:U/C:H/I:H/A:H","score":6.4},"cwes":["CWE-347"],"references":["http://lists.opensuse.org/opensuse-security-announce/2020-08/msg00067.html","http://lists.opensuse.org/opensuse-security-announce/2020-08/msg00069.html","http://ubuntu.com/security/notices/USN-4432-1","http://www.openwall.com/lists/oss-security/2020/07/29/3","http://www.openwall.com/lists/oss-security/2021/03/02/3"],"products":["canonical:ubuntu_linux","debian:debian_linux","gnu:grub2","microsoft:windows_10","microsoft:windows_8.1","microsoft:windows_rt_8.1","microsoft:windows_server_2012","microsoft:windows_server_2016","microsoft:windows_server_2019","opensuse:leap","redhat:enterprise_linux","redhat:enterprise_linux_atomic_host","redhat:openshift_container_platform","suse:suse_linux_enterprise_server"],"source":"nvd","synced_at":"2026-10-19T21:06:22.076270124+00:00"},"epss":{"cve":"CVE-2020-15705","score":0.01392,"percentile":0.72359,"date":"2026-10-31"},"kev":null,"osv":[],"attribution":["This product uses the NVD API but is not endorsed or certified by the NVD.","EPSS scores: FIRST Exploit Prediction Scoring System, https://www.first.org/epss","Known exploited vulnerabilities: CISA Known Exploited Vulnerabilities Catalog, https://www.cisa.gov/known-exploited-vulnerabilities-catalog","Package advisories: OSV (https://osv.dev), from the GitHub Advisory Database, PyPA, Go, RustSec and other ecosystem databases, under CC-BY 4.0 or CC0","CVE records: the CVE Program's CVE List (https://www.cve.org), under its terms of use (https://www.cve.org/Legal/TermsOfUse). CVE is a registered trademark of The MITRE Corporation; this product is not affiliated with the CVE Program."]}