Vulnerability · Published Feb 17, 2021 · Assigned by mitre
CVE-2021-27138
High 7.8
In plain English
A high-severity security flaw in the u-boot package (Alpine). There are no confirmed reports of exploitation so far. The chance it is exploited in the next 30 days is estimated at 1.1% (higher than 66% of all known vulnerabilities). Fixed versions are available - upgrade the affected package.
Severity (CVSS 3.1)7.8High
Exploit odds (30 days)1.1%top 34.1% of all CVEs
Exploited in the wildNo reportsnot in CISA KEV
Attack toolingNoneno public tooling known
Official description
The boot loader in Das U-Boot before 2021.04-rc2 mishandles use of unit addresses in a FIT.
Affected packages & fixed versions
| Ecosystem | Package | Fixed in | Advisory |
|---|---|---|---|
| Alpine:v3.20 | u-boot | 2021.04-r0 | ALPINE-CVE-2021-27138 |
| Alpine:v3.21 | u-boot | 2021.04-r0 | ALPINE-CVE-2021-27138 |
| Alpine:v3.22 | u-boot | 2021.04-r0 | ALPINE-CVE-2021-27138 |
| Alpine:v3.23 | u-boot | 2021.04-r0 | ALPINE-CVE-2021-27138 |
| Alpine:v3.24 | u-boot | 2021.04-r0 | ALPINE-CVE-2021-27138 |
| Debian:12 | u-boot | 2021.07+dfsg-2 | DEBIAN-CVE-2021-27138 |
| Debian:13 | u-boot | 2021.07+dfsg-2 | DEBIAN-CVE-2021-27138 |
| Debian:14 | u-boot | 2021.07+dfsg-2 | DEBIAN-CVE-2021-27138 |
Affected products (as reported)
References
- https://github.com/u-boot/u-boot/commit/b6f4c757959f8850e1299a77c8e5713da78e8ec0 x_refsource_MISC
- https://github.com/u-boot/u-boot/commit/3f04db891a353f4b127ed57279279f851c6b4917 x_refsource_MISC
- https://github.com/u-boot/u-boot/commit/79af75f7776fc20b0d7eb6afe1e27c00fdb4b9b4 x_refsource_MISC
- https://lists.debian.org/debian-lts-announce/2025/09/msg00037.html