MediumFix available
grub — security advisory
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.
- Products
- grub
- Affected versions
- Not specified
- Fixed versions
- 2.06-r0
- CVEs
- CVE-2020-15705
- Confirmed fixed CVEs
- Not specified
- Updated in this feed
- 1 Nov 2026, 12:03 UTC · Revision 1
Source evidence
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.
osv:ALPINE-CVE-2020-15705
grub
Fixed versions: 2.06-r0
grub
Fixed versions: 2.06-r0
grub
Fixed versions: 2.06-r0
grub
Fixed versions: 2.06-r0
grub
Fixed versions: 2.06-r0
grub
Fixed versions: 2.06-r0
grub
Fixed versions: 2.06-r0
grub
Fixed versions: 2.06-r0
Complete source record
{
"id": "bc1de1e3be6c7090c4fa5b3683a8b25a6772478398ea3835ecdfe8fec1c8f536",
"url": "https://osv.dev/vulnerability/ALPINE-CVE-2020-15705",
"method": "structured",
"payload": {
"kind": "advisory",
"title": "ALPINE-CVE-2020-15705",
"summary": "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.",
"evidence": "osv:ALPINE-CVE-2020-15705",
"products": [
{
"name": {
"value": "grub",
"evidence": "/affected/0/package/name"
},
"prerequisites": [],
"fixed_versions": [
{
"value": "2.06-r0",
"evidence": "/affected/0/ranges"
}
],
"affected_versions": []
},
{
"name": {
"value": "grub",
"evidence": "/affected/1/package/name"
},
"prerequisites": [],
"fixed_versions": [
{
"value": "2.06-r0",
"evidence": "/affected/1/ranges"
}
],
"affected_versions": []
},
{
"name": {
"value": "grub",
"evidence": "/affected/2/package/name"
},
"prerequisites": [],
"fixed_versions": [
{
"value": "2.06-r0",
"evidence": "/affected/2/ranges"
}
],
"affected_versions": []
},
{
"name": {
"value": "grub",
"evidence": "/affected/3/package/name"
},
"prerequisites": [],
"fixed_versions": [
{
"value": "2.06-r0",
"evidence": "/affected/3/ranges"
}
],
"affected_versions": []
},
{
"name": {
"value": "grub",
"evidence": "/affected/4/package/name"
},
"prerequisites": [],
"fixed_versions": [
{
"value": "2.06-r0",
"evidence": "/affected/4/ranges"
}
],
"affected_versions": []
},
{
"name": {
"value": "grub",
"evidence": "/affected/5/package/name"
},
"prerequisites": [],
"fixed_versions": [
{
"value": "2.06-r0",
"evidence": "/affected/5/ranges"
}
],
"affected_versions": []
},
{
"name": {
"value": "grub",
"evidence": "/affected/6/package/name"
},
"prerequisites": [],
"fixed_versions": [
{
"value": "2.06-r0",
"evidence": "/affected/6/ranges"
}
],
"affected_versions": []
},
{
"name": {
"value": "grub",
"evidence": "/affected/7/package/name"
},
"prerequisites": [],
"fixed_versions": [
{
"value": "2.06-r0",
"evidence": "/affected/7/ranges"
}
],
"affected_versions": []
}
],
"severity": "medium",
"structured": {
"id": "ALPINE-CVE-2020-15705",
"aliases": [
"ALPINE-CVE-2020-15705"
],
"metrics": [
{
"type": "CVSS_V3",
"score": "CVSS:3.1/AV:L/AC:H/PR:H/UI:N/S:U/C:H/I:H/A:H"
}
],
"affected": [
{
"ranges": [
{
"type": "ECOSYSTEM",
"events": [
{
"introduced": "0"
},
{
"fixed": "2.06-r0"
}
]
}
],
"package": {
"name": "grub",
"purl": "pkg:apk/alpine/grub?arch=source",
"ecosystem": "Alpine:v3.17"
},
"database_specific": {
"source": "https://storage.googleapis.com/cve-osv-conversion/alpine/ALPINE-CVE-2020-15705.json"
},
"ecosystem_specific": {}
},
{
"ranges": [
{
"type": "ECOSYSTEM",
"events": [
{
"introduced": "0"
},
{
"fixed": "2.06-r0"
}
]
}
],
"package": {
"name": "grub",
"purl": "pkg:apk/alpine/grub?arch=source",
"ecosystem": "Alpine:v3.18"
},
"database_specific": {
"source": "https://storage.googleapis.com/cve-osv-conversion/alpine/ALPINE-CVE-2020-15705.json"
},
"ecosystem_specific": {}
},
{
"ranges": [
{
"type": "ECOSYSTEM",
"events": [
{
"introduced": "0"
},
{
"fixed": "2.06-r0"
}
]
}
],
"package": {
"name": "grub",
"purl": "pkg:apk/alpine/grub?arch=source",
"ecosystem": "Alpine:v3.19"
},
"database_specific": {
"source": "https://storage.googleapis.com/cve-osv-conversion/alpine/ALPINE-CVE-2020-15705.json"
},
"ecosystem_specific": {}
},
{
"ranges": [
{
"type": "ECOSYSTEM",
"events": [
{
"introduced": "0"
},
{
"fixed": "2.06-r0"
}
]
}
],
"package": {
"name": "grub",
"purl": "pkg:apk/alpine/grub?arch=source",
"ecosystem": "Alpine:v3.20"
},
"database_specific": {
"source": "https://storage.googleapis.com/cve-osv-conversion/alpine/ALPINE-CVE-2020-15705.json"
},
"ecosystem_specific": {}
},
{
"ranges": [
{
"type": "ECOSYSTEM",
"events": [
{
"introduced": "0"
},
{
"fixed": "2.06-r0"
}
]
}
],
"package": {
"name": "grub",
"purl": "pkg:apk/alpine/grub?arch=source",
"ecosystem": "Alpine:v3.21"
},
"database_specific": {
"source": "https://storage.googleapis.com/cve-osv-conversion/alpine/ALPINE-CVE-2020-15705.json"
},
"ecosystem_specific": {}
},
{
"ranges": [
{
"type": "ECOSYSTEM",
"events": [
{
"introduced": "0"
},
{
"fixed": "2.06-r0"
}
]
}
],
"package": {
"name": "grub",
"purl": "pkg:apk/alpine/grub?arch=source",
"ecosystem": "Alpine:v3.22"
},
"database_specific": {
"source": "https://storage.googleapis.com/cve-osv-conversion/alpine/ALPINE-CVE-2020-15705.json"
},
"ecosystem_specific": {}
},
{
"ranges": [
{
"type": "ECOSYSTEM",
"events": [
{
"introduced": "0"
},
{
"fixed": "2.06-r0"
}
]
}
],
"package": {
"name": "grub",
"purl": "pkg:apk/alpine/grub?arch=source",
"ecosystem": "Alpine:v3.23"
},
"database_specific": {
"source": "https://storage.googleapis.com/cve-osv-conversion/alpine/ALPINE-CVE-2020-15705.json"
},
"ecosystem_specific": {}
},
{
"ranges": [
{
"type": "ECOSYSTEM",
"events": [
{
"introduced": "0"
},
{
"fixed": "2.06-r0"
}
]
}
],
"package": {
"name": "grub",
"purl": "pkg:apk/alpine/grub?arch=source",
"ecosystem": "Alpine:v3.24"
},
"database_specific": {
"source": "https://storage.googleapis.com/cve-osv-conversion/alpine/ALPINE-CVE-2020-15705.json"
},
"ecosystem_specific": {}
}
],
"modified": "2026-10-26T11:17:55.135165744Z",
"provider": "osv",
"upstream": [
"CVE-2020-15705"
],
"references": [
"https://security.alpinelinux.org/vuln/CVE-2020-15705"
]
},
"related_cves": [
{
"value": "CVE-2020-15705",
"evidence": "/upstream"
}
],
"security_relevant": true,
"severity_evidence": "/severity/0/score"
},
"source_id": "core-osv",
"document_id": 450444,
"published_at": "2020-07-29T18:15:14.187+00:00"
}