Cyber Resilience

CVE-2020-25632

High

Published: 03 March 2021

Published
03 March 2021
Modified
21 November 2024
KEV Added
—
Patch
—
CVSS Score v3.1 8.2 CVSS:3.1/AV:L/AC:L/PR:H/UI:N/S:C/C:H/I:H/A:H
EPSS Score 0.0002 4.7th percentile
Risk Priority 16 60% EPSS · 20% KEV · 20% CVSS

Summary

CVE-2020-25632 is a high-severity Use After Free (CWE-416) vulnerability in Redhat Enterprise Linux Server Aus. Its CVSS base score is 8.2 (High).

Operationally, ranked at the 4.7th percentile by exploit likelihood (below the median); it is not currently listed in the CISA KEV catalog.

EU & UK References

Vulnerability details

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…

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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.

CWE(s)
CWE-416

Related Threats

No named actor attribution yet. ATT&CK technique mapping in progress for this CVE.

Affected Assets

gnu
grub2
≤ 2.06
redhat
enterprise linux
7.0, 8.0
redhat
enterprise linux server aus
7.2, 7.3, 7.4, 7.6, 7.7
redhat
enterprise linux server eus
7.6, 7.7, 8.1
redhat
enterprise linux server tus
7.4, 7.6, 7.7, 8.2
redhat
enterprise linux workstation
7.0
fedoraproject
fedora
33, 34
netapp
ontap select deploy administration utility
all versions

Mitigating Controls

Likely Mitigating Controls AI

Per-CVE control mapping for this CVE has not run yet; the list below is derived from the weakness types (CWEs) cited in the NVD entry.

SI-16 Memory Protection
addresses: CWE-416

Use-after-free exploits that achieve arbitrary code execution are blocked or significantly hardened by non-executable pages and ASLR.

References