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Public proof of conceptFix available

CVE-2020-25632

A public proof of concept exists; no exploitation attested.

  • Published2021-03-03
  • WeaknessCWE-416

Am I affected?

With a domain, we read the version its public headers and pages expose. A distribution build can carry the fix under an older number.

Description

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.

Timeline

dates in UTC
  1. 2021-03-0317:15CVE publishedNVD
  2. 2026-10-2319:23First public proof of conceptPoC-in-GitHub

Observed activity

isMalicious corpus · updated 2026-10-23 21:37 UTC
Indicators tagged with this CVE, per day0 indicators over 7 days
Block these indicators
  • Firewall list (EDL, text): https://api.ismalicious.com/edl/cve/CVE-2020-25632?format=txt
  • CSV export: https://api.ismalicious.com/edl/cve/CVE-2020-25632?format=csv
  • TAXII collection of exploited CVEs
  • The EDL and CSV take an API key on the Pro plan.

Versions per branch

NVD
Redhat enterprise linux server aus
BranchAffectedFixed in
7.2= 7.2no fix published
7.3= 7.3no fix published
7.4= 7.4no fix published
7.6= 7.6no fix published
7.7= 7.7no fix published
8.2= 8.2no fix published
Redhat enterprise linux server tus
BranchAffectedFixed in
7.4= 7.4no fix published
7.6= 7.6no fix published
7.7= 7.7no fix published
8.2= 8.2no fix published
Redhat enterprise linux server eus
BranchAffectedFixed in
7.6= 7.6no fix published
7.7= 7.7no fix published
8.1= 8.1no fix published

5 more products in the sources.

as publishedRanges as NVD and OSV publish them; a distribution’s build can be fixed under an older number.

Distribution builds and vendor advisories

Packages from OSV.dev and products from the vendors' CSAF advisories.

version not verifiedVersions not verified: read as OSV.dev and the vendors publish them, not checked against each vendor's release list.

Packages

  • shim-unsigned-aarch64AlmaLinux:8all versions · fixed in 15-7.el8_1.alma
  • shim-unsigned-x64AlmaLinux:8all versions · fixed in 15.4-4.el8_1.alma
  • shim-x64AlmaLinux:8all versions · fixed in 15.4-2.el8_1.almaand 2 other packages

Full record on NVD

Fix

Advisories and patches

Detection

read 2026-10-23 19:23 UTC
Nuclei template
none so far
ProjectDiscovery
Exploit-DB
no entry
Exploit-DB
Proof-of-concept repositories
1 repository, unverifiedpauljrowland/BootHoleFix
PoC-in-GitHub

Sources

  • NVDCVSS 3.18.2read 2026-10-23
  • NVDCVSS 2.07.2read 2026-10-23
  • CNAweakness (CWE)CWE-416read 2026-10-23
  • NVDweakness (CWE)CWE-416read 2026-10-23
  • FIRST EPSSEPSS score1.2 %2026-10-23
  • PoC-in-GitHubproof of concept1read 2026-10-23
  • OSVaffected packages—

Technical details

CVSS v3 Vector
CVSS:3.1/AV:L/AC:L/PR:H/UI:N/S:C/C:H/I:H/A:H
Published
2021-03-03
Last Modified
2026-06-17
NVD status
Modified

Frequently asked questions

What is CVE-2020-25632?

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.

Is CVE-2020-25632 actively exploited?

Active exploitation of CVE-2020-25632 has not been confirmed. Its EPSS score was 1.2% on 2026-10-23, the estimated probability of exploitation in the next 30 days.

What is the CVSS score for CVE-2020-25632?

CVE-2020-25632 has a CVSS v3 base score of 8.2 (HIGH severity), with vector string CVSS:3.1/AV:L/AC:L/PR:H/UI:N/S:C/C:H/I:H/A:H.

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