CVE-2021-27138 json
The boot loader in Das U-Boot before 2021.04-rc2 mishandles use of unit addresses in a FIT.
published 2021-02-17 5 y ago modified 2026-06-17 4 mo ago also EUVD-2021-13905
- cvss
- 7.8
- version 3.1, CNA
- cisa kev
- Not listed
- not in CISA's catalog
- epss
- 1.1%
- EPSS 1.1% chance of exploitation in 30 days, percentile 65%
- public exploits
- 0
- none known
Summary
The boot loader in Das U-Boot before 2021.04-rc2 mishandles use of unit addresses in a FIT.
Patch / fix
- u-boot Debian 14, Debian 13, Debian 12 2021.07+dfsg-2
debian advisories DEBIAN-CVE-2021-27138
- u-boot Alpine 3.24, Alpine 3.23, Alpine 3.22 +8 more 2021.04-r0
alpine advisories ALPINE-CVE-2021-27138
Alpine secdb © Alpine Linux, from https://secdb.alpinelinux.org via OSV; changed: normalised to fixed package versions per release. CC BY-SA 4.0
Exploit prediction
1.10% chance of exploitation in the next 30 days, higher than 65% of all scored CVEs (FIRST EPSS, 2026-11-08).
CVSS scores
| assigned by | version | score | vector |
|---|---|---|---|
| CNA | 3.1 | 7.8 | CVSS:3.1/AC:L/AV:L/A:H/C:H/I:H/PR:N/S:U/UI:R |
| CNA | 3.1 | 7.8 | CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H |
| NVD | 3.1 | 7.8 | CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H |
| NVD | 2.0 | 6.8 | AV:N/AC:M/Au:N/C:P/I:P/A:P |
References
-
github.com
/u-boot/u-boot/commit/b6f4c757959f8850e1299a77c8e5713da78e8ec0
patch, third-party-advisory
-
github.com
/u-boot/u-boot/commit/3f04db891a353f4b127ed57279279f851c6b4917
patch, third-party-advisory
-
github.com
/u-boot/u-boot/commit/79af75f7776fc20b0d7eb6afe1e27c00fdb4b9b4
patch, third-party-advisory
- lists.debian.org /debian-lts-announce/2025/09/msg00037.html
Sources
- CVE List CVE-2021-27138
- NVD CVE-2021-27138
Fencer Vulns keeps one entry per vulnerability: the CVE id wins, then GHSA, and records that alias each other are merged, except that two CVEs always keep separate entries. The same data is available as JSON.