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Fencer Intel
medium 6.4

CVE-2020-15705 json

GRUB2: avoid loading unsigned kernels when GRUB is booted directly under secureboot without shim

published 6y ago modified 4mo ago also EUVD-2020-7691

cvss
6.4
version 3.1, CNA
cisa kev
Not listed
not in CISA's catalog
epss
1.4%
EPSS 1.4% chance of exploitation in 30 days, percentile 72%
public exploits
0
none known

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.

Patch / fix

  • Ubuntu grub2 in Ubuntu 2.02-2ubuntu8.16, 2.02~beta2-9ubuntu1.20, 2.02~beta2-36ubuntu3.26, 2.04-1ubuntu26.1
  • grub2 Ubuntu 16.04 LTS 2.02~beta2-36ubuntu3.26
  • grub2 Ubuntu 18.04 LTS 2.02-2ubuntu8.16
  • grub2 Ubuntu 20.04 LTS 2.04-1ubuntu26.1
  • grub2-signed Ubuntu 16.04 LTS 1.66.26
  • grub2-signed Ubuntu 18.04 LTS 1.93.18
  • grub2-signed Ubuntu 20.04 LTS 1.142.3
  • grub2 Ubuntu Pro 14.04 LTS 2.02~beta2-9ubuntu1.20
  • grub2-signed Ubuntu Pro 14.04 LTS 1.34.22

ubuntu advisories UBUNTU-CVE-2020-15705

Ubuntu security data © Canonical Ltd., from https://github.com/canonical/ubuntu-security-notices via OSV; changed: normalised to fixed package versions per release. CC BY-SA 4.0

  • grub2 RHEL 7 1:2.02-0.86.el7_8
  • shim RHEL 7 15-7.el7_9
  • mokutil RHEL 7 15-7.el7_8
  • fwupdate RHEL 7 12-6.el7_8
  • grub2-pc RHEL 7 1:2.02-0.86.el7_8
  • shim-x64 RHEL 7 15-7.el7_8
  • shim-ia32 RHEL 7 15-7.el7_8
  • grub2-ppc64 RHEL 7 1:2.02-0.86.el7_8

red hat advisories RHSA-2020:3273RHSA-2020:3276RHSA-2020:3274RHSA-2020:3271RHSA-2020:3275RHSA-2020:3217

  • grub2 SLES for SAP 12 SP2, SLES 12 SP2-LTSS, SLES 12 SP2-BCL +1 more 2.02~beta2-115.56.1
  • grub2 SLE Module for Server Applications 15 SP1, SLE Module for Basesystem 15 SP1 2.02-26.33.1
  • grub2 SLE Module for Server Applications 15 SP2, SLE Module for Basesystem 15 SP2 2.04-9.15.1
  • grub2 SLES for SAP 12 SP5, SLES for SAP 12 SP4, SLES 12 SP5 +3 more 2.02-12.39.1
  • grub2 SLES for SAP 12 SP3, SLES 12 SP3-LTSS, SLES 12 SP3-BCL +4 more 2.02-4.61.1
  • grub2 SLES for SAP 15, SLES 15-LTSS, SLE High Performance Computing 15-LTSS +1 more 2.02-19.56.1
  • grub2 SLES 11 SP4-LTSS 2.00-0.66.21.1

suse advisories SUSE-SU-2020:14461-1SUSE-SU-2020:2308-1SUSE-SU-2020:2307-1SUSE-SU-2020:2306-1SUSE-SU-2020:2305-1SUSE-SU-2020:2304-1

  • grub2 openSUSE Tumbleweed 2.06-7.1
  • grub2 openSUSE Leap 15.2 2.04-lp152.7.9.1
  • grub2 openSUSE Leap 15.1 2.02-lp151.21.27.1

opensuse advisories openSUSE-SU-2024:10824-1openSUSE-SU-2020:1282-1openSUSE-SU-2020:1280-1

  • grub Alpine 3.24, Alpine 3.23, Alpine 3.22 +5 more 2.06-r0

alpine advisories ALPINE-CVE-2020-15705

Alpine secdb © Alpine Linux, from https://secdb.alpinelinux.org via OSV; changed: normalised to fixed package versions per release. CC BY-SA 4.0

Is CVE-2020-15705 in your stack? Fencer shows which of your repositories are affected as soon as an advisory lands, and opens the fix as a pull request.

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Vendor advisories

What the vendors themselves say about their products: affected, fixed or not affected, and what to do.

red hat product security vex CVE-2020-15705 updated cvss 6.4

grub2: Fail kernel validation without shim protocol

  • Red Hat CodeReady Linux Builder (v. 8) shim-unsigned-x64 15-7.el8
    fixed: vendor fix RHSA-2020:3216
  • Red Hat CodeReady Linux Builder EUS (v. 8.1) shim-unsigned-x64 15-7.el8
    fixed: vendor fix RHSA-2020:3223
  • Red Hat Enterprise Linux BaseOS (v. 8) shim 15-14.el8_2, fwupd 1.1.4-7.el8_2, grub2 2.02-87.el8_2, shim-x64 15-14.el8_2, shim-aa64 15-14.el8_2, shim-ia32 15-14.el8_2, +18 more
    fixed: vendor fix RHSA-2020:3216
  • Red Hat Enterprise Linux BaseOS E4S (v. 8.0) shim 15-14.el8_0, fwupd 1.1.4-2.el8_0, grub2 2.02-87.el8_0, shim-x64 15-14.el8_0, shim-ia32 15-14.el8_0, grub2-pc 2.02-87.el8_0, +15 more
    fixed: vendor fix RHSA-2020:3227
  • Red Hat Enterprise Linux BaseOS EUS (v. 8.1) shim 15-14.el8_1, fwupd 1.1.4-2.el8_1, grub2 2.02-87.el8_1, shim-x64 15-14.el8_1, shim-aa64 15-14.el8_1, shim-ia32 15-14.el8_1, +18 more
    fixed: vendor fix RHSA-2020:3223
  • Red Hat Enterprise Linux Client (v. 7) shim 15-7.el7_9, mokutil 15-7.el7_8, fwupdate 12-6.el7_8, shim-x64 15-7.el7_8, shim-ia32 15-7.el7_8, grub2 2.02-0.86.el7_8, +23 more Red Hat Enterprise Linux Client Optional (v. 7) fwupdate 12-6.el7_8, grub2 2.02-0.86.el7_8, fwupdate-efi 12-6.el7_8, fwupdate-libs 12-6.el7_8, grub2-pc 2.02-0.86.el7_8, grub2-ppc64 2.02-0.86.el7_8, +16 more Red Hat Enterprise Linux ComputeNode (v. 7) shim 15-7.el7_9, mokutil 15-7.el7_8, fwupdate 12-6.el7_8, shim-x64 15-7.el7_8, shim-ia32 15-7.el7_8, grub2 2.02-0.86.el7_8, +23 more
    fixed: vendor fix RHSA-2020:3217
  • Red Hat Enterprise Linux ComputeNode EUS (v. 7.6) shim 15-8.el7, mokutil 15-8.el7_6, fwupdate 12-6.el7_6, shim-x64 15-8.el7_6, shim-ia32 15-8.el7_6, grub2 2.02-0.86.el7_6, +23 more
    fixed: vendor fix RHSA-2020:3271
  • Red Hat Enterprise Linux ComputeNode EUS (v. 7.7) shim 15-8.el7, mokutil 15-8.el7_7, fwupdate 12-6.el7_7, shim-x64 15-8.el7_7, shim-ia32 15-8.el7_7, grub2 2.02-0.86.el7_7, +23 more
    fixed: vendor fix RHSA-2020:3274
show 25 more
  • Red Hat Enterprise Linux ComputeNode Optional (v. 7) fwupdate 12-6.el7_8, grub2 2.02-0.86.el7_8, fwupdate-efi 12-6.el7_8, fwupdate-libs 12-6.el7_8, grub2-pc 2.02-0.86.el7_8, grub2-ppc64 2.02-0.86.el7_8, +16 more
    fixed: vendor fix RHSA-2020:3217
  • Red Hat Enterprise Linux ComputeNode Optional EUS (v. 7.6) fwupdate 12-6.el7_6, grub2 2.02-0.86.el7_6, fwupdate-efi 12-6.el7_6, fwupdate-libs 12-6.el7_6, grub2-pc 2.02-0.86.el7_6, grub2-ppc64 2.02-0.86.el7_6, +16 more
    fixed: vendor fix RHSA-2020:3271
  • Red Hat Enterprise Linux ComputeNode Optional EUS (v. 7.7) fwupdate 12-6.el7_7, grub2 2.02-0.86.el7_7, fwupdate-efi 12-6.el7_7, fwupdate-libs 12-6.el7_7, grub2-pc 2.02-0.86.el7_7, grub2-ppc64 2.02-0.86.el7_7, +16 more
    fixed: vendor fix RHSA-2020:3274
  • Red Hat Enterprise Linux for ARM and IBM Power LE (POWER9) Server (v. 7) grub2 2.02-0.86.el7_6, grub2-pc 2.02-0.86.el7_6, grub2-ppc64 2.02-0.86.el7_6, grub2-tools 2.02-0.86.el7_6, grub2-common 2.02-0.86.el7_6, grub2-efi-x64 2.02-0.86.el7_6, +13 more Red Hat Enterprise Linux for ARM and IBM Power LE (POWER9) Server Optional (v. 7) grub2 2.02-0.86.el7_6, grub2-pc 2.02-0.86.el7_6, grub2-ppc64 2.02-0.86.el7_6, grub2-tools 2.02-0.86.el7_6, grub2-common 2.02-0.86.el7_6, grub2-efi-x64 2.02-0.86.el7_6, +13 more
    fixed: vendor fix RHSA-2020:3271
  • Red Hat Enterprise Linux Server (v. 7) shim 15-7.el7_9, mokutil 15-7.el7_8, fwupdate 12-6.el7_8, shim-x64 15-7.el7_8, shim-ia32 15-7.el7_8, grub2 2.02-0.86.el7_8, +23 more
    fixed: vendor fix RHSA-2020:3217
  • Red Hat Enterprise Linux Server AUS (v. 7.2) shim 15-8.el7, shim 15-8.el7_2, mokutil 15-8.el7_2, grub2 2.02-0.86.el7_2, shim-signed 15-8.el7_2, grub2-pc 2.02-0.86.el7_2, +17 more
    fixed: vendor fix RHSA-2020:3273
  • Red Hat Enterprise Linux Server AUS (v. 7.3) shim 15-8.el7, shim 15-8.el7_3, mokutil 15-8.el7_3, grub2 2.02-0.86.el7, grub2-pc 2.02-0.86.el7, shim-signed 15-8.el7_3, +17 more
    fixed: vendor fix RHSA-2020:3276
  • Red Hat Enterprise Linux Server AUS (v. 7.4) shim 15-8.el7, mokutil 15-8.el7_4, fwupdate 9-10.el7_4, shim-x64 15-8.el7_4, shim-ia32 15-8.el7_4, grub2 2.02-0.86.el7_4, +21 more
    fixed: vendor fix RHSA-2020:3275
  • Red Hat Enterprise Linux Server E4S (v. 7.3) shim 15-8.el7, shim 15-8.el7_3, mokutil 15-8.el7_3, grub2 2.02-0.86.el7, grub2-pc 2.02-0.86.el7, shim-signed 15-8.el7_3, +18 more
    fixed: vendor fix RHSA-2020:3276
  • Red Hat Enterprise Linux Server E4S (v. 7.4) shim 15-8.el7, mokutil 15-8.el7_4, fwupdate 9-10.el7_4, shim-x64 15-8.el7_4, shim-ia32 15-8.el7_4, grub2 2.02-0.86.el7_4, +22 more
    fixed: vendor fix RHSA-2020:3275
  • Red Hat Enterprise Linux Server EUS (v. 7.6) shim 15-8.el7, mokutil 15-8.el7_6, fwupdate 12-6.el7_6, shim-x64 15-8.el7_6, shim-ia32 15-8.el7_6, grub2 2.02-0.86.el7_6, +23 more
    fixed: vendor fix RHSA-2020:3271
  • Red Hat Enterprise Linux Server EUS (v. 7.7) shim 15-8.el7, mokutil 15-8.el7_7, fwupdate 12-6.el7_7, shim-x64 15-8.el7_7, shim-ia32 15-8.el7_7, grub2 2.02-0.86.el7_7, +23 more
    fixed: vendor fix RHSA-2020:3274
  • Red Hat Enterprise Linux Server Optional (v. 7) fwupdate 12-6.el7_8, grub2 2.02-0.86.el7_8, fwupdate-efi 12-6.el7_8, fwupdate-libs 12-6.el7_8, grub2-pc 2.02-0.86.el7_8, grub2-ppc64 2.02-0.86.el7_8, +16 more
    fixed: vendor fix RHSA-2020:3217
  • Red Hat Enterprise Linux Server Optional AUS (v. 7.2) shim 15-8.el7, grub2 2.02-0.86.el7_2, grub2-pc 2.02-0.86.el7_2, shim-unsigned-x64 15-8.el7, grub2-tools 2.02-0.86.el7_2, shim-unsigned-ia32 15-8.el7, +14 more
    fixed: vendor fix RHSA-2020:3273
  • Red Hat Enterprise Linux Server Optional AUS (v. 7.3) shim 15-8.el7, grub2 2.02-0.86.el7, grub2-pc 2.02-0.86.el7, grub2-tools 2.02-0.86.el7, grub2-common 2.02-0.86.el7, shim-unsigned-x64 15-8.el7, +14 more
    fixed: vendor fix RHSA-2020:3276
  • Red Hat Enterprise Linux Server Optional AUS (v. 7.4) fwupdate 9-10.el7_4, grub2 2.02-0.86.el7_4, fwupdate-efi 9-10.el7_4, fwupdate-libs 9-10.el7_4, grub2-pc 2.02-0.86.el7_4, grub2-tools 2.02-0.86.el7_4, +14 more
    fixed: vendor fix RHSA-2020:3275
  • Red Hat Enterprise Linux Server Optional E4S (v. 7.3) shim 15-8.el7, grub2 2.02-0.86.el7, grub2-pc 2.02-0.86.el7, grub2-tools 2.02-0.86.el7, grub2-common 2.02-0.86.el7, shim-unsigned-x64 15-8.el7, +15 more
    fixed: vendor fix RHSA-2020:3276
  • Red Hat Enterprise Linux Server Optional E4S (v. 7.4) fwupdate 9-10.el7_4, grub2 2.02-0.86.el7_4, fwupdate-efi 9-10.el7_4, fwupdate-libs 9-10.el7_4, grub2-pc 2.02-0.86.el7_4, grub2-tools 2.02-0.86.el7_4, +15 more
    fixed: vendor fix RHSA-2020:3275
  • Red Hat Enterprise Linux Server Optional EUS (v. 7.6) fwupdate 12-6.el7_6, grub2 2.02-0.86.el7_6, fwupdate-efi 12-6.el7_6, fwupdate-libs 12-6.el7_6, grub2-pc 2.02-0.86.el7_6, grub2-ppc64 2.02-0.86.el7_6, +16 more
    fixed: vendor fix RHSA-2020:3271
  • Red Hat Enterprise Linux Server Optional EUS (v. 7.7) fwupdate 12-6.el7_7, grub2 2.02-0.86.el7_7, fwupdate-efi 12-6.el7_7, fwupdate-libs 12-6.el7_7, grub2-pc 2.02-0.86.el7_7, grub2-ppc64 2.02-0.86.el7_7, +16 more
    fixed: vendor fix RHSA-2020:3274
  • Red Hat Enterprise Linux Server Optional TUS (v. 7.3) shim 15-8.el7, grub2 2.02-0.86.el7, grub2-pc 2.02-0.86.el7, grub2-tools 2.02-0.86.el7, grub2-common 2.02-0.86.el7, shim-unsigned-x64 15-8.el7, +14 more
    fixed: vendor fix RHSA-2020:3276
  • Red Hat Enterprise Linux Server Optional TUS (v. 7.4) fwupdate 9-10.el7_4, grub2 2.02-0.86.el7_4, fwupdate-efi 9-10.el7_4, fwupdate-libs 9-10.el7_4, grub2-pc 2.02-0.86.el7_4, grub2-tools 2.02-0.86.el7_4, +14 more
    fixed: vendor fix RHSA-2020:3275
  • Red Hat Enterprise Linux Server TUS (v. 7.3) shim 15-8.el7, shim 15-8.el7_3, mokutil 15-8.el7_3, grub2 2.02-0.86.el7, grub2-pc 2.02-0.86.el7, shim-signed 15-8.el7_3, +17 more
    fixed: vendor fix RHSA-2020:3276
  • Red Hat Enterprise Linux Server TUS (v. 7.4) shim 15-8.el7, mokutil 15-8.el7_4, fwupdate 9-10.el7_4, shim-x64 15-8.el7_4, shim-ia32 15-8.el7_4, grub2 2.02-0.86.el7_4, +21 more
    fixed: vendor fix RHSA-2020:3275
  • Red Hat Enterprise Linux Workstation (v. 7) shim 15-7.el7_9, mokutil 15-7.el7_8, fwupdate 12-6.el7_8, shim-x64 15-7.el7_8, shim-ia32 15-7.el7_8, grub2 2.02-0.86.el7_8, +23 more Red Hat Enterprise Linux Workstation Optional (v. 7) fwupdate 12-6.el7_8, grub2 2.02-0.86.el7_8, fwupdate-efi 12-6.el7_8, fwupdate-libs 12-6.el7_8, grub2-pc 2.02-0.86.el7_8, grub2-ppc64 2.02-0.86.el7_8, +16 more
    fixed: vendor fix RHSA-2020:3217

Red Hat CSAF VEX © Red Hat, Inc., from https://security.access.redhat.com/data/csaf/v2/vex/; changed: reduced to product statuses and remediations. CC BY 4.0 · csaf

cisa ICSA-21-336-06 updated cvss 6.4

Hitachi Energy APM Edge

  • Hitachi Energy APM Edge 3.0, 2.0, 1.0
    affected: vendor fix, mitigation “Physically protect process control systems from direct access by unauthorized personnel.” search.abb.com

From CISA ICS and IT advisories (CSAF, https://github.com/cisagov/CSAF), a U.S. Government work; changed: reduced to products, statuses and remediations. CISA notification · csaf

Exploit prediction

1.39% chance of exploitation in the next 30 days, higher than 72% of all scored CVEs (FIRST EPSS, 2026-11-09).

CVSS scores

assigned by version score vector
CNA 3.1 6.4 CVSS:3.1/AV:L/AC:H/PR:H/UI:N/S:U/C:H/I:H/A:H
NVD 3.1 6.4 CVSS:3.1/AV:L/AC:H/PR:H/UI:N/S:U/C:H/I:H/A:H
NVD 2.0 4.4 AV:L/AC:M/Au:N/C:P/I:P/A:P

Affected products

  • Ubuntu grub2 in Ubuntu

Classification

Weakness
  • CWE-347 Improper Verification of Cryptographic Signature

References

Sources

Fencer Intel keeps one entry per vulnerability: the CVE id wins, then GHSA, and records that alias each other are merged, except that two CVEs always keep separate entries. The same data is available as JSON.