dbcve.org
Romepi FirmwareOperating system · Amd

CVE-2021-26407

MEDIUM · 5.5 CVSS v3.1 Published 2023-01-11
Fix available
A fix is available. Upgrade to 1.0.0.a or later.
See remediation →
57/100
Remediation priority · Elevated
Zero-click

Official description Straight from the sourceThe vendor's or NVD's own wording, published unedited. Authoritative, but often terse — it says what broke, rarely what to do.

NVD · unedited
A randomly generated Initialization Vector (IV) may lead to a collision of IVs with the same key potentially resulting in information disclosure.

Technical summary Written by usOur analysis, written from the advisory, the CVSS vector and the affected-version data. It adds context the advisory leaves out, and never invents facts that are not in the source.

dbcve analysis · moderate confidence

This vulnerability involves improper Initialization Vector (IV) generation in cryptographic operations where randomly generated IVs collide when using the same encryption key, potentially exposing sensitive data through pattern analysis or known-plaintext attacks.

MitigationImplement proper IV generation using cryptographically secure random number generators with sufficient entropy, ensure IVs are unique per encryption operation, and consider using authenticated encryption modes that handle IVs automatically.

Verify against the referenced sources before acting — the references below are authoritative for this CVE, this summary is not.

Affected products & versions What the vendor confirmedThe version ranges the vendor confirmed as vulnerable. If your version sits inside a range here, treat yourself as exposed until you have upgraded.

NVD · CPE data
Romepi FirmwareOperating system
Affected:< 1.0.0.a

CVSS breakdown How the score is builtThe industry scoring standard. It rates how the flaw is reached, what it takes to exploit, and what an attacker gains — the score is derived from those, not the other way round.

From the vector
Attack vector
Local
Complexity
Low
Privileges
Low
User interaction
None
Scope
Unchanged
Confidentiality
High
Integrity
None
Availability
None

CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:N

Am I affected? How to checkSteps we derive from the advisory and the affected-version data, so you can decide whether this CVE reaches your setup. They are a guide, not a scan — your own configuration is the authority.

dbcve checks

Work through these to decide whether this CVE applies to you.

  1. Identify the installed AMD Romepi firmware version
    Check the system firmware/BIOS version information, typically accessible via 'dmidecode -s bios-version', 'inxi -M', or through UEFI/BIOS setup screen. Look for a version string associated with AMD Romepi firmware.
    Affected if The firmware version string is present and lower than 1.0.0.a (e.g., 0.9.x, 1.0.0.0-beta, or any version starting with 0.)
  2. Locate the AMD Romepi firmware image file
    Check typical firmware storage locations such as /boot/, /lib/firmware/, or vendor-specific paths like /opt/amd/romepi/. Look for files named 'romepi', 'romepi.bin', or similar firmware blobs.
    Affected if A Romepi firmware file exists on the system and its embedded version metadata is lower than 1.0.0.a.
  3. Verify if cryptographic encryption is enabled in the firmware
    Inspect the firmware configuration or platform security settings. On some systems, this may be accessible via 'cryptsetup luksDump' on encrypted volumes, or by checking UEFI secure boot and encryption-related variables via 'efivar -l' or platform-specific tooling.
    Affected if Disk or memory encryption features relying on the Romepi cryptographic subsystem are active and the firmware version is below 1.0.0.a.
  4. Confirm the platform uses AMD Rome processors with Romepi
    Verify the hardware platform is AMD Rome-based. Use 'lscpu' or 'cat /proc/cpuinfo' to check the CPU model, or review system documentation for the platform type.
    Affected if The system runs on AMD Rome processors and the associated Romepi firmware version is below 1.0.0.a.

The environment is affected if the AMD Romepi firmware version is installed and is numerically lower than 1.0.0.a, particularly when cryptographic encryption operations are enabled on the platform.

Generated from the published advisory. Verify against your own configuration.

Check your environment

Paste your version and any relevant configuration and it will be compared against the affected criteria above. Do not include secrets or credentials.

AI-assisted, checked against the advisory. Informational, not a guarantee.

Remediation Closing itWhat it takes to close this. Where a vendor fix exists we point at it; where none exists we say so plainly, and can build one. Effort estimates are scoped from the advisory, not from your codebase.

dbcve · scoped
Upgrade available Upgrade to 1.0.0.a or later
Fixed in 1.0.0.a
Interim mitigation

Implement proper IV generation using cryptographically secure random number generators with sufficient entropy, ensure IVs are unique per encryption operation, and consider using authenticated encryption modes that handle IVs automatically.

Recommended fix Moderate confidence

Romepi Firmware version 1.0.0.a or later

  1. Check the current Romepi Firmware version installed on the system
  2. Obtain the fixed Romepi Firmware version 1.0.0.a or later from AMD's official support channels at www.amd.com
  3. Follow AMD's standard firmware update procedure for Romepi devices to apply the upgrade
  4. Verify the firmware version has been successfully updated after the process

Generated from the published advisory — verify against the referenced sources before acting.

Fix this in Romepi Firmware Scoped from the published advisory
  • Consultation4.0 h
  • Implementation8.0 h
  • Testing6.0 h
  • Review / QA4.0 h
22.0 hours of engineering $3,860
Get the upgrade done

An estimate, not a bill — we confirm scope with you before any work starts. Need it this week? Rush from $6,176.

Scan for this in your stack

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References Go to the primary sourcePrimary sources — vendor advisories, patches and trackers. Where our summary and a reference disagree, the reference wins.

Primary sources

Practitioner notes

Contributed

Peer-ranked notes from engineers who’ve handled CVE-2021-26407 in production — separate from our analysis above.

No notes yet

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What this is

A place for practitioners to share what actually worked: a mitigation you’ve tested, a configuration change, a version- or environment-specific caveat, or a link to a verified patch. The most useful notes rise to the top as peers upvote them, so the signal stays high.

What belongs here
  • Verified mitigations, workarounds, and config changes
  • Version or environment caveats, and links to real fixes
  • No weaponised exploit code, or anything meant to cause harm
  • No spam, self-promotion, credentials, or personal data