CVE-2021-27138: denx u-boot
Modified
AliasesALPINE-CVE-2021-27138UBUNTU-CVE-2021-27138DEBIAN-CVE-2021-27138
Published 17-02-2021Last modified 03-11-2025
Vulnerability summary
CVE-2021-27138 is a high (CVSS 7.8) vulnerability in denx u-boot. EPSS estimates a 1.10% chance of exploitation in the next 30 days, higher than 65.4% of scored vulnerabilities.
CVSS score
7.8/10
010
High · v3.1 (CVE.org)EPSS score
1.10%
0%100%
Low · 0.00 pp in 30 daysKEVNot listedNot listed by any tracked catalog.
RansomwareNot flaggedNo ransomware use recorded.
Public exploits0No public exploits recorded
Advisory lineage
Upstream 0 · Downstream 1Timeline
- 17-02-2021PublishedVulnerability first disclosed.
- 03-11-2025Last modifiedVulnerability information updated.
Description
The boot loader in Das U-Boot before 2021.04-rc2 mishandles use of unit addresses in a FIT.
CVSS metrics
6 scores · 5 sources · 2 versionsHigh 7.8Preferred score · CVE.org (CNA)
CVSS:3.1/AC:L/AV:L/A:H/C:H/I:H/PR:N/S:U/UI:RSourcesAll 5 agree
- OSV · AlpineEcosystem advisory · calculated7.8HighCVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H
- OSV · UbuntuEcosystem advisory · calculated7.8HighCVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H
- OSV · DebianEcosystem advisory · calculated7.8HighCVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H
- NVDNIST7.8HighCVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H
Medium 6.8Preferred score · NVD (NIST)
AV:N/AC:M/Au:N/C:P/I:P/A:PSourcesSingle source
EPSS trend
Probability
1.10%
Chance of exploitation in the next 30 days
Percentile
65%
Versus all other CVEs
30-day change
No change 0.00 pp
From 1.10% on 22-09-2026
22-09-202622-10-2026
Known exploited
Compare KEV catalogs
CISA KEVNot in the CISA KEV catalog.
ENISA CNWNot in the ENISA CNW catalog.
CIRCLNot in the CIRCL catalog.
Public exploits
0 foundNo public exploits indexed.
Weaknesses
CWE · root causeNo weakness data has been published for this record.
Affected systems
Alpine1 product
- u-boot< 2021.04-r0
Debian1 product
- u-boot< 2021.07+dfsg-2
Denx1 product
- u-boot≤ 2021.01 | 2021.04:rc1
Ubuntu1 product
- u-bootAll versions (No fix recorded)
4 vendors · 4 products
References
8 links- github.com/u-boot/u-boot/commit/b6f4c757959f8850e1299a77c8e5713da78e8ec0X Refsource MISCPatchThird Party Advisory
- github.com/u-boot/u-boot/commit/3f04db891a353f4b127ed57279279f851c6b4917X Refsource MISCPatchThird Party Advisory
- github.com/u-boot/u-boot/commit/79af75f7776fc20b0d7eb6afe1e27c00fdb4b9b4X Refsource MISCPatchThird Party Advisory
