CVE-2021-34383
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 · uneditedBootloader contains a vulnerability in NVIDIA MB2 where a potential heap overflow might lead to denial of service or escalation of privileges.
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 confidenceA heap overflow vulnerability exists in the NVIDIA MB2 bootloader that allows an attacker to overflow heap memory, potentially leading to denial of service or privilege escalation. The vulnerability stems from insufficient bounds checking during heap operations in the bootloader phase.
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< 32.5.1CVSS 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
- High
- User interaction
- None
- Scope
- Unchanged
- Confidentiality
- High
- Integrity
- High
- Availability
- High
CVSS:3.1/AV:L/AC:L/PR:H/UI:N/S:U/C:H/I:H/A:H
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 checksWork through these to decide whether this CVE applies to you.
-
Confirm Jetson device typeRun 'cat /proc/device-tree/model' or check for /etc/nv_tegra_release to verify the system is an NVIDIA Jetson deviceAffected if The system is not a Jetson device - this CVE only applies to Jetson Linux on Jetson hardware
-
Check Jetson Linux versionRun 'cat /etc/nv_tegra_release' and look for the L4T release version number in the format R32.xAffected if The Jetson Linux version shown is below 32.5.1 (for example, R32.4 or R32.5) - the system falls within the affected version range
-
Identify MB2 bootloader versionCheck the bootloader binary in /boot/ or U-Boot environment using 'ls -la /boot/' and look for mb2 related files, or check bootloader logs at boot time for MB2 version stringsAffected if Unable to verify MB2 bootloader is updated; the bootloader component itself cannot be confirmed as patched
-
Verify secure boot statusCheck if U-Boot or the bootloader chain has secure boot enabled by inspecting boot configuration files or running 'tegrasign --pubkeykey' tools if availableAffected if Secure boot is not enforced, allowing potentially vulnerable unsigned bootloader images to load
The environment is affected if it is a Jetson device running Jetson Linux version below 32.5.1 with an unpatched MB2 bootloader and secure boot not enforced.
Generated from the published advisory. Verify against your own configuration.
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.
From vendor data32.5.1
Apply the NVIDIA firmware/security update for MB2 bootloader once released. Verify secure boot configurations and ensure only signed bootloader images are accepted.
- Consultation4.0 h
- Implementation8.0 h
- Testing6.0 h
- Review / QA4.0 h
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
Free · runs locallyCheck whether your project pulls in CVE-2021-34383 — or any other known-vulnerable package — straight from your lock files. Free and open source; it runs locally and uploads nothing.
References Go to the primary sourcePrimary sources — vendor advisories, patches and trackers. Where our summary and a reference disagree, the reference wins.
Primary sourcesPractitioner notes
ContributedPeer-ranked notes from engineers who’ve handled CVE-2021-34383 in production — separate from our analysis above.
The advisory tells you what broke. It rarely tells you what actually worked. If you’ve dealt with this one, that detail is what the next engineer is searching for.
- The version that genuinely resolved it — not the one the vendor claimed
- A config change or rule that shut the vector down
- A gotcha in the upgrade path that cost you an afternoon
No notes yet
Be the first to add a field note for this CVE — a mitigation you’ve verified, a version caveat, or a link to a working fix. Sign in above to contribute.
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.
- 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