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CVE-2021-27097

The boot loader in Das U-Boot before 2021.04-rc2 mishandles a modified FIT.

7.8 HighFix available

The boot loader in Das U-Boot before 2021.04-rc2 mishandles a modified FIT.

Attack profile

How easy it is to exploit

Attack vector
Local
Complexity
Low
Privileges needed
None
User interaction
Required

What an attacker can affect

Confidentiality
High
Integrity
High
Availability
High

Exploit likelihood

1.07%Up 0.2 points since Apr 14, 2021
90%50%10%1%

What each source reports

CVE List Score used 7.8

The boot loader in Das U-Boot before 2021.04-rc2 mishandles a modified FIT.

Record
CVE-2021-27097
CVSS 3.1
7.8 HighCVSS:3.1/AC:L/AV:L/A:H/C:H/I:H/PR:N/S:U/UI:R
Updated
2026-11-02
EUVDEUVD-2021-13868 7.8

The boot loader in Das U-Boot before 2021.04-rc2 mishandles a modified FIT.

Record
EUVD-2021-13868
CVSS 3.1
7.8 HighCVSS:3.1/AC:L/AV:L/A:H/C:H/I:H/PR:N/S:U/UI:R
Updated
2026-11-02
GitHub AdvisoriesGHSA-3w66-96j7-fmcp 7.8

The boot loader in Das U-Boot before 2021.04-rc2 mishandles a modified FIT.

The boot loader in Das U-Boot before 2021.04-rc2 mishandles a modified FIT.

Record
GHSA-3w66-96j7-fmcp
CVSS 3.1
7.8 HighCVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H
Updated
2026-11-02
NVD 7.8

The boot loader in Das U-Boot before 2021.04-rc2 mishandles a modified FIT.

Record
CVE-2021-27097
CVSS 3.1
7.8 HighCVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H
CVSS 2.0
6.8 MediumAV:N/AC:M/Au:N/C:P/I:P/A:P
Updated
2026-11-02
OSVALPINE-CVE-2021-27097 7.8

The boot loader in Das U-Boot before 2021.04-rc2 mishandles a modified FIT.

Record
ALPINE-CVE-2021-27097
CVSS 3.1
7.8 HighCVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H
Updated
2026-11-02
OSV 7.8

The boot loader in Das U-Boot before 2021.04-rc2 mishandles a modified FIT.

Record
CVE-2021-27097
CVSS 3.1
7.8 HighCVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H
Updated
2026-11-02
OSVDEBIAN-CVE-2021-27097 7.8

The boot loader in Das U-Boot before 2021.04-rc2 mishandles a modified FIT.

Record
DEBIAN-CVE-2021-27097
CVSS 3.1
7.8 HighCVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H
Updated
2026-11-02
OSVOESA-2021-1130 7.8

uboot-tools security update

This package includes the mkimage program, which allows generation of U-Boot images in various formats, and the fw_printenv and fw_setenv programs to read and modify U-Boot's environment.

Security Fix(es):

The boot loader in Das U-Boot before 2021.04-rc2 mishandles a modified FIT.(CVE-2021-27097)

The boot loader in Das U-Boot before 2021.04-rc2 mishandles use of unit addresses in a FIT.(CVE-2021-27138)

Record
OESA-2021-1130
CVSS 3.1
7.8 HighCVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H
Updated
2026-11-02
OSVUBUNTU-CVE-2021-27097 7.8

The boot loader in Das U-Boot before 2021.04-rc2 mishandles a modified FIT.

Record
UBUNTU-CVE-2021-27097
CVSS 3.1
7.8 HighCVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H
Updated
2026-11-02

Affected products

Affected packages

Affected packages
PackageAffectedFixed
u-boot
Alpine:v3.14
 before 2021.04-r0
2021.04-r0
u-boot
Alpine:v3.15
 before 2021.04-r0
2021.04-r0
u-boot
Alpine:v3.16
 before 2021.04-r0
2021.04-r0
u-boot
Alpine:v3.17
 before 2021.04-r0
2021.04-r0
u-boot
Alpine:v3.18
 before 2021.04-r0
2021.04-r0
u-boot
Alpine:v3.19
 before 2021.04-r0
2021.04-r0
u-boot
Alpine:v3.20
 before 2021.04-r0
2021.04-r0
u-boot
Alpine:v3.21
 before 2021.04-r0
2021.04-r0
u-boot
Alpine:v3.22
 before 2021.04-r0
2021.04-r0
u-boot
Alpine:v3.23
 before 2021.04-r0
2021.04-r0
Show 10 moreShow less
Affected packages
PackageAffectedFixed
u-boot
Alpine:v3.24
 before 2021.04-r0
2021.04-r0
u-boot
Debian:12
 before 2021.07+dfsg-2
2021.07+dfsg-2
u-boot
Debian:13
 before 2021.07+dfsg-2
2021.07+dfsg-2
u-boot
Debian:14
 before 2021.07+dfsg-2
2021.07+dfsg-2
u-boot
Debian:11
 before 2021.01+dfsg-5+deb11u2, plus listed versions
2021.01+dfsg-52021.01+dfsg-5+deb11u1
2021.01+dfsg-5+deb11u2
uboot-tools
openEuler:20.03-LTS
 before 2020.07-3.oe1
2020.07-3.oe1
uboot-tools
openEuler:20.03-LTS-SP1
 before 2020.07-3.oe1
2020.07-3.oe1
u-boot
Ubuntu:Pro:16.04:LTS
 All versions, plus listed versions
2015.04+dfsg1-2ubuntu12015.10+dfsg1-22015.10+dfsg1-32015.10+dfsg1-42016.01+dfsg1-1
Show 7 moreShow less
2016.01+dfsg1-1ubuntu12016.01+dfsg1-2ubuntu12016.01+dfsg1-2ubuntu22016.01+dfsg1-2ubuntu32016.01+dfsg1-2ubuntu52016.01+dfsg1-2ubuntu5+esm12016.01+dfsg1-2ubuntu5+esm2
 None known
u-boot
Ubuntu:Pro:18.04:LTS
 All versions, plus listed versions
2016.03+dfsg1-6ubuntu22018.07~rc3+dfsg1-0ubuntu1~18.04.12018.07~rc3+dfsg1-0ubuntu2~18.04.12018.07~rc3+dfsg1-0ubuntu3~18.04.12019.07+dfsg-1ubuntu4~18.04.1
Show 4 moreShow less
2020.10+dfsg-1ubuntu0~18.04.22020.10+dfsg-1ubuntu0~18.04.32020.10+dfsg-1ubuntu0~18.04.3+esm12020.10+dfsg-1ubuntu0~18.04.3+esm2
 None known
u-boot
Ubuntu:Pro:20.04:LTS
 All versions, plus listed versions
2019.07+dfsg-1ubuntu32019.07+dfsg-1ubuntu52019.07+dfsg-1ubuntu62020.10+dfsg-1ubuntu0~20.04.22021.01+dfsg-3ubuntu0~20.04.1
Show 6 moreShow less
2021.01+dfsg-3ubuntu0~20.04.32021.01+dfsg-3ubuntu0~20.04.42021.01+dfsg-3ubuntu0~20.04.52021.01+dfsg-3ubuntu0~20.04.62021.01+dfsg-3ubuntu0~20.04.6+esm12021.01+dfsg-3ubuntu0~20.04.6+esm2
 None known

History

History
RecordedChangedSources
first indexedCVE List, EUVD, GitHub Advisories, NVD, OSV

Dates are when Every CVE recorded each change. Upstream dates may differ.

In short

CVE-2021-27097 is a high vulnerability (CVSS 7.8) in Denx U-boot, published February 17, 2021. No source lists public exploit code. EPSS puts the chance of exploitation in the next 30 days at 1.07%, the 64th percentile. Fixed in u-boot 2021.04-r0.

References

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