A flaw was found in grub2 in versions prior to 2.06, where it incorrectly enables the usage of the ACPI command when Secure Boot is enabled. This flaw allows an attacker with privileged access to craft a Secondary System Description Table (SSDT) containing code to overwrite the Linux kernel lockdown variable content directly into memory. The table is further loaded and executed by the kernel, defeating its Secure Boot lockdown and allowing the attacker to load unsigned code. The highest threat from this vulnerability is to data confidentiality and integrity, as well as system availability.
CVE-2020-14372
“—” beside the score: it is equal to NVD's CVSS score.
Score 7.5 from GitHub Security Advisory (severity: HIGH) published 2022-05-24. NVD baseline CVSS 7.5; sources differ by 0.0.
Also known asEUVD-2020-6512 (ENISA EUVD) · GHSA-xh73-rjw5-phcw (GitHub Security Advisories)Source: ENISA EUVD
- Public exploit or proof-of-concept code is available
A fix is available — apply it.
- CVSS v3
- 7.5
- EG Score
- 7.5HIGHmedium confidence
- EG Risk
- 50EG Risk 50/100
EG Risk is EchelonGraph's 0–100 priority score. It fuses impact severity (EG Severity, the CVSS base score, never the KEV-floored or EPSS-lifted EG Score) with real-world exploitation and automatability, under weights EchelonGraph set by hand, so you can rank equal-severity CVEs and fix the most dangerous first. Higher = act sooner.
How it’s computed (value × EchelonGraph’s weight)Severity75% × 45%Impact severity (EG Severity): CVSS 7.5 of 10. Never the KEV-floored or EPSS-lifted EG Score.Exploitation40% × 40%EchelonGraph's fixed weight for EG-KEV Tier 3 (Elevated): a constant, not a probability.Automatability0% × 15%CISA's BOD 26-04 default: no one has published Automatable for this CVE, and CISA treats it as “no” for a CVE not in KEV.SSVC (CISA's decision table, applied by EchelonGraph): Track at low, Track* at medium and Attend at high mission impact.Exploitation public PoC (exploit code on record) · Automatable no (CISA's BOD 26-04 default) · Technical impact total (CISA's BOD 26-04 default). EchelonGraph holds no SSVC assessment of this CVE from CISA: none of these inputs is from Vulnrichment. EchelonGraph applied CISA's decision table to them; CISA publishes SSVC inputs and the table, not a decision for each CVE.Action: A fix is available. Apply it within your standard update timelines at low or medium mission impact and sooner than that at high. - EPSS PROB
- 1.7%
- EPSS %ILE
- 77th
- KEV
- Not listed
What the EG score is made of (scorer v4.0: the three questions the 0–10 score mixes, published apart · methodology)
The EG score (7.5): severity, escalated by confirmed exploitation. This CVE's 7.5 is its impact severity (EG Severity), not escalated.
- EG Severity
- 7.5 HIGHCVSS-B, impact only: no KEV listing, EPSS or EG-KEV tier raises it.GitHub Security Advisory CVSS
- EG Likelihood
- 1.7% within 30 daysSource: FIRST EPSS (model v2026.06.15, score date 2026-10-28). FIRST's exploitation probability, not an EchelonGraph model.
- Confirmed exploitation
- None on record (CISA KEV, EG-KEV Tier 1)Reported apart from the likelihood: an observed fact, not a probability.
- EG Priority
- SSVC Track* at medium mission impactTrack at low, Track* at medium and Attend at high mission impact.CISA BOD 26-04: 14 days if the affected system is publicly exposed; Fix on system upgrade if it is not.Each input and its source, and whom BOD 26-04 binds: the SSVC and BOD 26-04 blocks below.
SSVC (CISA's decision table, applied by EchelonGraph)Track at low, Track* at medium and Attend at high mission impact.
A fix is available. Apply it within your standard update timelines at low or medium mission impact and sooner than that at high.
Exploitation public PoC (exploit code on record) · Automatable no (CISA's BOD 26-04 default) · Technical impact total (CISA's BOD 26-04 default). EchelonGraph holds no SSVC assessment of this CVE from CISA: none of these inputs is from Vulnrichment. EchelonGraph applied CISA's decision table to them; CISA publishes SSVC inputs and the table, not a decision for each CVE. Mission impact is CISA's Mission & Well-being decision point, and only you can judge it. CISA's table makes it high when Mission Prevalence is Essential — the vulnerable component "directly provides capabilities that constitute at least one MEF for at least one entity" (MEF: mission essential function) — or when Public Well-Being Impact is Irreversible: "multiple fatalities are likely", the cyber-physical system "is likely lost or destroyed", "extreme or serious externalities" are imposed on other parties, or social systems such as elections or the financial grid "are destabilized and potentially collapse". CISA's decision table
BOD 26-04 (CISA's remediation timeline, Table 1)14 days if the affected system is publicly exposed; Fix on system upgrade if it is not.
The score's inputs: In CISA KEV no (CISA's KEV catalog) · Automatable no (CISA's BOD 26-04 default) · Technical impact total (CISA's BOD 26-04 default). Where an input reads “CISA's BOD 26-04 default”, no one has published it for this CVE, and CISA's implementation guidance says: “If “Automatable” and “Technical Impact” information items about a CVE ID are not available and the CVE ID is not in the KEV Catalog, CISA will treat its values as “no” and “total,” respectively, until CISA or a third party provides metadata about the CVE ID. CISA will always provide the Vulnrichment data for a CVE ID listed in the KEV Catalog.” Whether your system is publicly exposed is yours to answer. BOD 26-04 binds US Federal Civilian Executive Branch agencies; for anyone else it is CISA's published timeline, a reference rather than an obligation. The directive · how EchelonGraph applies it
Published
March 3, 2021
Last Modified
November 21, 2024
References (5)
- secalert@redhat · CVE Programhttps://access.redhat.com/security/vulnerabilities/RHSB-2021-003Patch · Third Party Advisory
- secalert@redhat · CVE Programhttps://bugzilla.redhat.com/show_bug.cgi?id=1873150Issue Tracking · Third Party Advisory
- secalert@redhat · CVE Programhttps://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/ZWZ36QK4IKU6MWDWNOOWKPH3WXZBHT2R/
- secalert@redhat · CVE Programhttps://security.gentoo.org/glsa/202104-05Third Party Advisory
- secalert@redhat · CVE Programhttps://security.netapp.com/advisory/ntap-20210416-0004/Third Party Advisory
Vendor Advisories for CVE-2020-14372(14)
These vendors published their own advisory mentioning this CVE — often with vendor-specific remediation steps + affected product lists not in NVD.
- RHSA-2021:3675Red Hat Product SecurityMedium
Red Hat Security Advisory: shim and fwupd security update
- RHSA-2021:2790Red Hat Product SecurityMedium
Red Hat Security Advisory: shim and fwupd security update
- RHSA-2021:2566Red Hat Product SecurityMedium
Red Hat Security Advisory: fwupd security update
- RHSA-2021:1734Red Hat Product SecurityMedium
Red Hat Security Advisory: shim security update
- CVE-2020-14372Microsoft Security Response Center (MSRC)High
A flaw was found in grub2 in versions prior to 2.06 where it incorrectly enables the usage of the ACPI command when Secure Boot is enabled. This flaw allows an attacker with privileged access to craft a Secondary System Description Table (SSDT) containing code to overwrite the Linux kernel lockdown variable content directly into memory. The table is further loaded and executed by the kernel defeating its Secure Boot lockdown and allowing the attacker to load unsigned code. The highest threat from this vulnerability is to data confidentiality and integrity as well as system availability.
- RHSA-2021:0701Red Hat Product SecurityMedium
Red Hat Security Advisory: grub2 security update
- RHSA-2021:0700Red Hat Product SecurityMedium
Red Hat Security Advisory: grub2 security update
- RHSA-2021:0699Red Hat Product SecurityMedium
Red Hat Security Advisory: grub2 security update
- +6 more
Patch Availability(12)
| Vendor / Ecosystem | Fix (by version range) / Patch | Released | Source |
|---|---|---|---|
| ubuntu | grub-efi-arm64-signed (1.167.2+2.04-1ubuntu44.2) @ groovy | 2026-10-28 | ubuntu |
| redhat | shim-unsigned-x64-0:15.4-4.el8_1 | 2021-09-28 | redhat |
| redhat | fwupd-0:1.5.9-1.el8_4 | 2021-06-29 | redhat |
| redhat | grub2-1:2.02-0.87.el7_9.2 | 2021-03-02 | redhat |
| redhat | grub2-1:2.02-0.86.el7_3.2 | 2021-03-02 | redhat |
| redhat | grub2-1:2.02-90.el8_3.1 | 2021-03-02 | redhat |
| redhat | grub2-1:2.02-0.86.el7_2.2 | 2021-03-02 | redhat |
| redhat | grub2-1:2.02-0.86.el7_4.2 | 2021-03-02 | redhat |
| redhat | grub2-1:2.02-0.86.el7_6.3 | 2021-03-02 | redhat |
| redhat | grub2-1:2.02-0.86.el7_7.3 | 2021-03-02 | redhat |
| redhat | grub2-1:2.02-87.el8_2.3 | 2021-03-02 | redhat |
| redhat | grub2-1:2.02-87.el8_1.2 | 2021-03-02 | redhat |
Patches are aggregated from vendor advisories (Red Hat, Microsoft, Cisco, GitHub) and package ecosystems (OSV, GHSA). Multiple rows for the same upstream release have been deduplicated.
Affected Packages
(13 across 13 ecosystems)
Alpine:v3.17(1)
| Package | Vulnerable range | Fix by version range | Dependents |
|---|---|---|---|
| grub | — |
| — |
Alpine:v3.18(1)
| Package | Vulnerable range | Fix by version range | Dependents |
|---|---|---|---|
| grub | — |
| — |
Alpine:v3.19(1)
| Package | Vulnerable range | Fix by version range | Dependents |
|---|---|---|---|
| grub | — |
| — |
Alpine:v3.20(1)
| Package | Vulnerable range | Fix by version range | Dependents |
|---|---|---|---|
| grub | — |
| — |
Alpine:v3.21(1)
| Package | Vulnerable range | Fix by version range | Dependents |
|---|---|---|---|
| grub | — |
| — |
Alpine:v3.22(1)
| Package | Vulnerable range | Fix by version range | Dependents |
|---|---|---|---|
| grub | — |
| — |
Alpine:v3.23(1)
| Package | Vulnerable range | Fix by version range | Dependents |
|---|---|---|---|
| grub | — |
| — |
Alpine:v3.24(1)
| Package | Vulnerable range | Fix by version range | Dependents |
|---|---|---|---|
| grub | — |
| — |
Debian:10(1)
| Package | Vulnerable range | Fix by version range | Dependents |
|---|---|---|---|
| grub2 | 2.02+dfsg1-20, 2.02+dfsg1-20+deb10u1, 2.02+dfsg1-20+deb10u2, 2.02+dfsg1-20+deb10u3 |
| — |
Debian:11(1)
| Package | Vulnerable range | Fix by version range | Dependents |
|---|---|---|---|
| grub2 | — |
| — |
Debian:12(1)
| Package | Vulnerable range | Fix by version range | Dependents |
|---|---|---|---|
| grub2 | — |
| — |
Debian:13(1)
| Package | Vulnerable range | Fix by version range | Dependents |
|---|---|---|---|
| grub2 | — |
| — |
Debian:14(1)
| Package | Vulnerable range | Fix by version range | Dependents |
|---|---|---|---|
| grub2 | — |
| — |
Weakness Classification(1)
MITRE Common Weakness Enumeration — the root-cause categories this CVE belongs to.
Additional Vendor Advisories
(1)
Vendors that published advisories for this CVE beyond the curated set above. Broader coverage but minimal per-row detail — click through for the original advisory.
Data Freshness Timeline
(refreshed 9× in last 7d / 40× in last 30d)
Each row is a time one of our pipelines fetched, updated or re-scored this CVE. For example, "NVD update" means NVD published or revised its analysis for this CVE; "MITRE cvelistV5" means we ingested or refreshed it from the CNA feed. An arrow marks a change the record states ("CVSS v3 → 9.1"); EPSS and GHSA rows show the values recorded at that time, not what changed (EPSS values are rounded; hover one for the exact figures). Most recent first.
Showing the most recent 99 of 203 refreshes on record for this CVE.
A repeat, a row identical to one the same pipeline wrote less than 10 seconds earlier, is not a separate refresh and is not counted. 1 repeat row among the latest 100 is merged into the row it repeats. The 104 oldest rows on record are not shown and were not checked, so the counts can still include repeats.
- 2026-10-31 16:28 UTCEPSS rescoreEPSS 1.7% · 77th percentile
- 2026-10-30 16:29 UTCEPSS rescoreEPSS 1.7% · 77th percentile
- 2026-10-29 16:28 UTCEPSS rescoreEPSS 1.7% · 77th percentile
- 2026-10-28 17:46 UTCEG score recompute
- 2026-10-28 17:46 UTCVendor advisory
- 2026-10-28 17:46 UTCGHSA enrichmentGHSA-xh73-rjw5-phcw · GitHub severity HIGH · GitHub CVSS 7.5
- 2026-10-28 16:27 UTCEPSS rescoreEPSS 1.7% · 77th percentile
- 2026-10-27 16:27 UTCEPSS rescoreEPSS 1.7% · 77th percentile
- 2026-10-26 16:27 UTCEPSS rescoreEPSS 1.7% · 77th percentile
- 2026-10-25 18:50 UTCEG score recompute
- 2026-10-25 16:28 UTCEPSS rescoreEPSS 1.7% · 77th percentile
- 2026-10-24 16:28 UTCEPSS rescoreEPSS 1.7% · 77th percentile
- 2026-10-23 16:27 UTCEPSS rescoreEPSS 1.7% · 77th percentile
- 2026-10-22 16:28 UTCEPSS rescoreEPSS 1.7% · 77th percentile
- 2026-10-21 16:28 UTCEPSS rescoreEPSS 1.7% · 77th percentile
- 2026-10-21 15:27 UTCEG score recompute
- 2026-10-21 15:27 UTCVendor advisory
- 2026-10-21 15:27 UTCGHSA enrichmentGHSA-xh73-rjw5-phcw · GitHub severity HIGH · GitHub CVSS 7.5
- 2026-10-20 16:28 UTCEPSS rescoreEPSS 1.7% · 77th percentile
- 2026-10-19 16:27 UTCEPSS rescoreEPSS 1.7% · 77th percentile
- 2026-10-19 00:25 UTCOSV refresh
- 2026-10-18 16:28 UTCEPSS rescoreEPSS 1.7% · 77th percentile
- 2026-10-18 09:34 UTCEG score recompute
- 2026-10-17 16:28 UTCEPSS rescoreEPSS 1.7% · 77th percentile
- 2026-10-16 16:32 UTCEPSS rescoreEPSS 1.7% · 77th percentile
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- 2026-10-15 16:27 UTCEPSS rescoreEPSS 1.7% · 77th percentile
- 2026-10-14 16:28 UTCEPSS rescoreEPSS 1.7% · 77th percentile
- 2026-10-13 16:28 UTCEPSS rescoreEPSS 1.7% · 77th percentile
- 2026-10-12 19:46 UTCEG score recompute
- 2026-10-12 16:29 UTCEPSS rescoreEPSS 1.7% · 77th percentile
- 2026-10-12 00:09 UTCEG score recompute
- 2026-10-11 13:42 UTCEPSS rescoreEPSS 1.7% · 77th percentile
- 2026-10-10 19:56 UTCEPSS rescoreEPSS 1.7% · 77th percentile
- 2026-10-09 20:03 UTCEPSS rescoreEPSS 1.7% · 77th percentile
- 2026-10-08 16:38 UTCEPSS rescoreEPSS 1.7% · 77th percentile
- 2026-10-07 23:43 UTCEPSS rescoreEPSS 1.7% · 76th percentile
- 2026-10-06 15:13 UTCEPSS rescoreEPSS 1.7% · 76th percentile
- 2026-10-05 17:39 UTCEPSS rescoreEPSS 1.7% · 76th percentile
- 2026-10-04 23:18 UTCEPSS rescoreEPSS 1.7% · 76th percentile
- 2026-10-03 14:22 UTCEPSS rescoreEPSS 1.7% · 76th percentile
- 2026-09-30 15:11 UTCEG score recompute
- 2026-09-30 14:59 UTCEPSS rescoreEPSS 1.7% · 76th percentile
- 2026-09-27 13:40 UTCEPSS rescoreEPSS 1.7% · 76th percentile
- 2026-09-26 15:54 UTCEPSS rescoreEPSS 1.7% · 76th percentile
- 2026-09-26 07:55 UTCOSV refresh
- 2026-09-26 00:20 UTCEPSS rescoreEPSS 1.7% · 76th percentile
- 2026-09-24 13:59 UTCEPSS rescoreEPSS 1.7% · 76th percentile
- 2026-09-22 14:43 UTCEPSS rescoreEPSS 1.7% · 76th percentile
- 2026-09-21 20:28 UTCEPSS rescoreEPSS 1.7% · 76th percentile
- 2026-09-19 15:37 UTCEPSS rescoreEPSS 1.7% · 76th percentile
- 2026-09-18 19:23 UTCEPSS rescoreEPSS 1.7% · 76th percentile
- 2026-09-17 19:22 UTCEPSS rescoreEPSS 1.7% · 76th percentile
- 2026-09-16 14:04 UTCEPSS rescoreEPSS 1.7% · 76th percentile
- 2026-09-15 03:06 UTCEPSS rescoreEPSS 1.7% · 76th percentile
- 2026-09-13 16:42 UTCEPSS rescoreEPSS 1.7% · 76th percentile
- 2026-09-12 14:56 UTCEPSS rescoreEPSS 1.7% · 76th percentile
- 2026-09-11 14:48 UTCEPSS rescoreEPSS 1.7% · 76th percentile
- 2026-09-11 09:32 UTCEPSS rescoreEPSS 1.7% · 76th percentile
- 2026-09-07 15:57 UTCEPSS rescoreEPSS 1.7% · 76th percentile
- 2026-09-06 21:31 UTCOSV refresh
- 2026-09-06 13:44 UTCEPSS rescoreEPSS 1.7% · 76th percentile
- 2026-09-05 15:24 UTCEPSS rescoreEPSS 1.7% · 75th percentile
- 2026-09-04 13:56 UTCEPSS rescoreEPSS 1.7% · 76th percentile
- 2026-09-04 05:03 UTCEPSS rescoreEPSS 1.7% · 76th percentile
- 2026-09-02 14:08 UTCEPSS rescoreEPSS 1.7% · 76th percentile
- 2026-09-01 03:32 UTCEPSS rescoreEPSS 1.7% · 76th percentile
- 2026-08-30 19:14 UTCEPSS rescoreEPSS 1.7% · 76th percentile
- 2026-08-30 01:18 UTCEPSS rescoreEPSS 1.7% · 75th percentile
- 2026-08-28 21:37 UTCEPSS rescoreEPSS 1.7% · 75th percentile
- 2026-08-27 14:21 UTCEPSS rescoreEPSS 1.7% · 76th percentile
- 2026-08-26 14:42 UTCEPSS rescoreEPSS 1.7% · 76th percentile
- 2026-08-25 13:45 UTCEPSS rescoreEPSS 1.7% · 75th percentile
- 2026-08-20 22:51 UTCEPSS rescoreEPSS 1.7% · 75th percentile
- 2026-08-20 07:25 UTCOSV refresh
- 2026-08-19 17:00 UTCEPSS rescoreEPSS 1.7% · 75th percentile
- 2026-08-18 13:44 UTCEPSS rescoreEPSS 1.7% · 75th percentile
- 2026-08-17 13:43 UTCEPSS rescoreEPSS 1.7% · 75th percentile
- 2026-08-16 14:52 UTCEPSS rescoreEPSS 1.7% · 75th percentile
- 2026-08-16 02:11 UTCEPSS rescoreEPSS 1.7% · 75th percentile
- 2026-08-15 01:26 UTCEPSS rescoreEPSS 1.7% · 75th percentile
- 2026-08-13 21:57 UTCEPSS rescoreEPSS 1.7% · 75th percentile
- 2026-08-12 13:47 UTCEPSS rescoreEPSS 1.7% · 75th percentile
- 2026-08-09 13:43 UTCEPSS rescoreEPSS 1.7% · 75th percentile
- 2026-08-08 16:33 UTCEPSS rescoreEPSS 1.7% · 75th percentile
- 2026-08-07 16:23 UTCEPSS rescoreEPSS 1.7% · 75th percentile
- 2026-08-06 13:43 UTCEPSS rescoreEPSS 1.7% · 75th percentile
- 2026-08-05 19:14 UTCEPSS rescoreEPSS 1.7% · 75th percentile
- 2026-08-05 02:41 UTCOSV refresh
- 2026-08-04 15:06 UTCEPSS rescoreEPSS 1.7% · 75th percentile
- 2026-08-04 10:34 UTCEPSS rescoreEPSS 1.7% · 75th percentile
- 2026-08-03 10:32 UTCEPSS rescoreEPSS 1.7% · 75th percentile
- 2026-08-02 02:23 UTCEPSS rescoreEPSS 1.7% · 75th percentile
- 2026-08-01 04:12 UTCEPSS rescoreEPSS 1.7% · 75th percentile
- 2026-07-30 16:24 UTCEPSS rescoreEPSS 1.7% · 75th percentile
- 2026-07-30 01:27 UTCEPSS rescoreEPSS 1.7% · 75th percentile
- 2026-07-28 15:32 UTCEPSS rescoreEPSS 1.7% · 75th percentile
- 2026-07-26 14:51 UTCEPSS rescoreEPSS 1.7% · 75th percentile
- 2026-07-25 14:14 UTCEPSS rescoreEPSS 1.7% · 75th percentile
- 2026-07-24 14:14 UTCEPSS rescoreEPSS 1.7% · 75th percentile
Publicly available exploits
(1 reference)Public exploit code is referenced for this CVE (1 GitHub PoC). Defenders should treat patch urgency accordingly.
- GitHub PoCkukrimate/CVE-2020-14372Published Apr 19, 2021
Write-up and proof of concept exploit for CVE-2020-14372
Open source ↗
Related CVEs(same product + same vendor + same CWE)
Same product
10 shownAlpine:v3.17:grub
Same vendor
6 shownredhat:RHSA-2021:0696
Frequently asked(5)
What is CVE-2020-14372?
When was the CVE record for CVE-2020-14372 published?
Is CVE-2020-14372 actively exploited?
What is the CVSS score of CVE-2020-14372?
How do I remediate CVE-2020-14372?
Dependency Blast Radius
See which npm, PyPI, Go, and Maven packages are affected by CVE-2020-14372
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