DescriptionDas U-Boot is a device bootloader that can read its configuration from an AES encrypted file. For devices utilizing this environment encryption mode, U-Boot's use of a zero initialization vector may allow attacks against the underlying cryptographic implementation and allow an attacker to decrypt the data. Das U-Boot's AES-CBC encryption feature uses a zero (0) initialization vector. This allows an attacker to perform dictionary attacks on encrypted data produced by Das U-Boot to learn information about the encrypted data.
SourceCVE (at NVD; CERT, LWN, oss-sec, fulldisc, bugtraq, EDB, Metasploit, Red Hat, Ubuntu, Gentoo, SUSE bugzilla/CVE, Mageia, GitHub code/issues, web search, more)
NVD severitylow

Vulnerable and fixed packages

The table below lists information on source packages.

Source PackageReleaseVersionStatus
u-boot (PTS)stretch2016.11+dfsg1-4vulnerable
bullseye, sid2020.07+dfsg-1vulnerable

The information below is based on the following data on fixed versions.

PackageTypeReleaseFixed VersionUrgencyOriginDebian Bugs
u-bootsourcewheezy(not affected)


[wheezy] - u-boot <not-affected> (Vulnerable code do not exist)
jessie+ no built targets use ENV_AES by default, but fw_printenv/fw_setenv
in u-boot-tools supports it. Upstream has deprecated it and plans to remove
it in future versions.
Negligible security impact

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