High severity · published Feb 17, 2021
CVE-2021-27138
The boot loader in Das U-Boot before 2021.04-rc2 mishandles use of unit addresses in a FIT
7.8
CVSS
1.1%
EPSS
No
On KEV
Description
The boot loader in Das U-Boot before 2021.04-rc2 mishandles use of unit addresses in a FIT.
CVSS vector
CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H
Attack vector
Local
Complexity
Low
Privileges
None
User interaction
Required
Confidentiality
High
Integrity
High
Availability
High
Scope
Unchanged
Exploitation
Is it being used?
Exploit prediction (EPSS)1.1% · higher than 66% of CVEs
Exploited in the wildNo evidence yet
CISA KEVNot listed
Ransomware campaign useNot known
Affected products
Which versions
UB
U-boot · Denx
through 2021.01; 2021.04 · source: NVD
References
NVD
https://nvd.nist.gov/vuln/detail/CVE-2021-27138
CVE.org
https://www.cve.org/CVERecord?id=CVE-2021-27138
Patch
https://github.com/u-boot/u-boot/commit/3f04db891a353f4b127ed57279279f851c6b4917
Patch
https://github.com/u-boot/u-boot/commit/79af75f7776fc20b0d7eb6afe1e27c00fdb4b9b4
Patch
https://github.com/u-boot/u-boot/commit/b6f4c757959f8850e1299a77c8e5713da78e8ec0
lists.debian.org
https://lists.debian.org/debian-lts-announce/2025/09/msg00037.html
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