CVE-2020-25632

HIGHNVD 8.28.2—
EchelonGraph scoreMEDIUM confidence

Score 8.2 from GitHub Security Advisory (severity: HIGH) published 2022-05-24. NVD baseline CVSS 8.2; sources differ by 0.0.

Triggered by: GitHub Security Advisory CVSS
Sources: epss, ghsa, nvd
8.2EG
EchelonGraph verdictPlan a fixSerious severity, but no confirmed exploitation yet.
  • High severity, but no confirmed exploitation yet
CISA-KEV: Not listedEPSS PROB: 1.2%CVSS: 8.2Exploit: None knownExposed services: Not assessed

A fix is available — apply it.

A flaw was found in grub2 in versions prior to 2.06. The rmmod implementation allows the unloading of a module used as a dependency without checking if any other dependent module is still loaded leading to a use-after-free scenario. This could allow arbitrary code to be executed or a bypass of Secure Boot protections. The highest threat from this vulnerability is to data confidentiality and integrity as well as system availability.

CVSS v3
8.2
EG Score
8.2HIGHmedium confidence
EG Risk
42
EG Risk 42/100CISA SSVC

EG Risk is EchelonGraph's 0–100 priority score: it fuses intrinsic severity with real-world exploitation and automatability so you can rank equal-severity CVEs and fix the most dangerous first. Higher = act sooner. Distinct from the 0–10 EG Score (severity).

How it’s computed
Severity82% × 45%
Exploitation1% × 40%
Automatability30% × 15%
CISA SSVC: Track at low or medium mission impact; Track or Attend at high (mission-essential systems).
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
1.2%
EPSS %ILE
65th
KEV
Not listed

CISA SSVCTrack at low or medium mission impact; Track or Attend at high (mission-essential systems).

A fix is available. Apply it within your standard update timelines at low or medium mission impact and sooner than that at high.

Exploitation none (no KEV listing, exploit record or EPSS ≥ 50%) · Automatable unknown (not published for this CVE) · Technical impact partial (CVSS below 9.0). Mission impact is CISA's Mission & Well-being decision point, and only you can judge it: high means the affected system is essential to your organisation's mission, or its compromise could cause irreversible harm to people. CISA's decision table

Published

March 3, 2021

Last Modified

November 21, 2024

Advisory Details (4)

Auto-updated Sep 8, 2026
Patch available. Sources: redhat.
generic

NetApp Product Security

https://security.netapp.com/advisory/ntap-20220325-0001/
generic

GRUB: Multiple vulnerabilities (GLSA 202104-05) — Gentoo security

https://security.gentoo.org/glsa/202104-05
generic

[SECURITY] Fedora 34 Update: shim-15.4-4 - package-announce - Fedora mailing-lists

https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/ZWZ36QK4IKU6MWDWNOOWKPH3WXZBHT2R/
redhat Patch Available

1879577 – (CVE-2020-25632) CVE-2020-25632 grub2: Use-after-free in rmmod command

Affected: Red Hat Enterprise Linux 8.1 Extended Update Support

https://bugzilla.redhat.com/show_bug.cgi?id=1879577

Vendor Advisories for CVE-2020-25632(14)

These vendors published their own advisory mentioning this CVE — often with vendor-specific remediation steps + affected product lists not in NVD.

Patch Availability(12)

Vendor / EcosystemFix (by version range) / PatchReleasedSource
ubuntugrub-efi-arm64-signed (1.167.2+2.04-1ubuntu44.2) @ groovy2026-05-26ubuntu
redhatshim-unsigned-x64-0:15.4-4.el8_12021-09-28redhat
redhatfwupd-0:1.5.9-1.el8_42021-06-29redhat
redhatgrub2-1:2.02-87.el8_1.22021-03-02redhat
redhatgrub2-1:2.02-0.86.el7_4.22021-03-02redhat
redhatgrub2-1:2.02-0.86.el7_6.32021-03-02redhat
redhatgrub2-1:2.02-0.86.el7_7.32021-03-02redhat
redhatgrub2-1:2.02-90.el8_3.12021-03-02redhat
redhatgrub2-1:2.02-0.87.el7_9.22021-03-02redhat
redhatgrub2-1:2.02-87.el8_2.32021-03-02redhat
redhatgrub2-1:2.02-0.86.el7_2.22021-03-02redhat
redhatgrub2-1:2.02-0.86.el7_3.22021-03-02redhat

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)
PackageVulnerable rangeFix by version rangeDependents
grub—
  • every version up to 2.06-r0: fixed in 2.06-r0
—
Alpine:v3.18(1)
PackageVulnerable rangeFix by version rangeDependents
grub—
  • every version up to 2.06-r0: fixed in 2.06-r0
—
Alpine:v3.19(1)
PackageVulnerable rangeFix by version rangeDependents
grub—
  • every version up to 2.06-r0: fixed in 2.06-r0
—
Alpine:v3.20(1)
PackageVulnerable rangeFix by version rangeDependents
grub—
  • every version up to 2.06-r0: fixed in 2.06-r0
—
Alpine:v3.21(1)
PackageVulnerable rangeFix by version rangeDependents
grub—
  • every version up to 2.06-r0: fixed in 2.06-r0
—
Alpine:v3.22(1)
PackageVulnerable rangeFix by version rangeDependents
grub—
  • every version up to 2.06-r0: fixed in 2.06-r0
—
Alpine:v3.23(1)
PackageVulnerable rangeFix by version rangeDependents
grub—
  • every version up to 2.06-r0: fixed in 2.06-r0
—
Alpine:v3.24(1)
PackageVulnerable rangeFix by version rangeDependents
grub—
  • every version up to 2.06-r0: fixed in 2.06-r0
—
Debian:10(1)
PackageVulnerable rangeFix by version rangeDependents
grub22.02+dfsg1-20, 2.02+dfsg1-20+deb10u1, 2.02+dfsg1-20+deb10u2, 2.02+dfsg1-20+deb10u3
  • every version up to 2.02+dfsg1-20+deb10u4: fixed in 2.02+dfsg1-20+deb10u4
—
Debian:11(1)
PackageVulnerable rangeFix by version rangeDependents
grub2—
  • every version up to 2.04-16: fixed in 2.04-16
—
Debian:12(1)
PackageVulnerable rangeFix by version rangeDependents
grub2—
  • every version up to 2.04-16: fixed in 2.04-16
—
Debian:13(1)
PackageVulnerable rangeFix by version rangeDependents
grub2—
  • every version up to 2.04-16: fixed in 2.04-16
—
Debian:14(1)
PackageVulnerable rangeFix by version rangeDependents
grub2—
  • every version up to 2.04-16: fixed in 2.04-16
—

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 6× in last 7d / 30× in last 30d)

Each row is a source pipeline that fetched or updated this CVE on that date, with what changed. 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. Most recent first.

Showing the most recent 100 of 170 total refreshes for this CVE.

  1. 2026-10-05 17:39 UTCEPSS rescore
  2. 2026-10-04 23:18 UTCEPSS rescore
  3. 2026-10-03 14:22 UTCEPSS rescore
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  5. 2026-09-30 15:16 UTCEG score recompute
  6. 2026-09-30 14:59 UTCEPSS rescore
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  9. 2026-09-26 08:25 UTCOSV refresh
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  1. 2026-09-10 09:29 UTCEPSS rescore
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  3. 2026-09-07 15:57 UTCEPSS rescore
  4. 2026-09-06 21:43 UTCOSV refresh
  5. 2026-09-06 13:44 UTCEPSS rescore
  6. 2026-09-05 15:24 UTCEPSS rescore
  7. 2026-09-04 13:57 UTCEPSS rescore
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  17. 2026-08-20 22:52 UTCEPSS rescore
  18. 2026-08-20 07:55 UTCOSV refresh
  19. 2026-08-19 17:00 UTCEPSS rescore
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  30. 2026-08-06 13:43 UTCEPSS rescore
  31. 2026-08-05 19:14 UTCEPSS rescore
  32. 2026-08-05 03:10 UTCOSV refresh
  33. 2026-08-04 15:06 UTCEPSS rescore
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  45. 2026-07-23 14:15 UTCEPSS rescore
  46. 2026-07-23 14:15 UTCEPSS rescore
  47. 2026-07-23 01:51 UTCEG score recompute
  48. 2026-07-22 22:37 UTCEG score recompute
  49. 2026-07-22 14:05 UTCEPSS rescore
  50. 2026-07-21 15:22 UTCEPSS rescore
  51. 2026-07-21 15:22 UTCEPSS rescore
  52. 2026-07-20 17:04 UTCEPSS rescore
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  57. 2026-07-19 00:59 UTCOSV refresh
  58. 2026-07-18 10:02 UTCEPSS rescore
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  69. 2026-07-09 19:07 UTCEPSS rescore
  70. 2026-07-08 15:12 UTCEPSS rescore
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  73. 2026-07-06 16:25 UTCEPSS rescore
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  75. 2026-07-06 02:21 UTCEPSS rescore

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Frequently asked(5)

What is CVE-2020-25632?
CVE-2020-25632 is a high vulnerability published on March 3, 2021. A flaw was found in grub2 in versions prior to 2.06. The rmmod implementation allows the unloading of a module used as a dependency without checking if any other dependent module is still loaded leading to a use-after-free scenario. This could allow arbitrary code to be executed or a bypass of…
When was CVE-2020-25632 disclosed?
CVE-2020-25632 was first published on March 3, 2021, with the most recent update on November 21, 2024. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2020-25632 actively exploited?
CVE-2020-25632 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 1.2% probability of exploitation in the next 30 days (65th percentile of EPSS-scored CVEs).
What is the CVSS score of CVE-2020-25632?
CVE-2020-25632 has a CVSS v3 base score of 8.2 (NVD).
How do I remediate CVE-2020-25632?
A fix for CVE-2020-25632 is available: update to the fixed version the vendor names in its advisory. The vendor advisories EchelonGraph has for CVE-2020-25632 are linked in the Vendor Advisories panel on this page.

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