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FabricApplication · Linuxfoundation

CVE-2021-43669

HIGH · 7.5 CVSS v3.1 Published 2021-11-18
Patch available
A vendor patch is available. No clean upgrade release — apply the published patch.
See remediation →
84/100
Remediation priority · High
Remotely reachable No privileges Zero-click Patch available

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 vulnerability has been detected in HyperLedger Fabric v1.4.0, v2.0.0, v2.0.1, v2.3.0. It can easily break down as many orderers as the attacker wants. This bug can be leveraged by constructing a message whose header is invalid to the interface Order. This bug has been admitted and fixed by the developers of Fabric.

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

A detailed technical summary for this CVE is being prepared.

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
FabricApplication
Affected:= 1.4.0= 2.0.0= 2.0.1= 2.3.0

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
Network
Complexity
Low
Privileges
None
User interaction
None
Scope
Unchanged
Confidentiality
None
Integrity
None
Availability
High

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

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
Patch available Apply the vendor patch
Vendor patch github.com →
Recommended fix Moderate confidence

Upgrade to the latest patch release in your respective minor version branch (v1.4.10+/v2.0.3+/v2.3.3+) or the latest stable release (v2.5.x recommended)

  1. 1. Identify your current Hyperledger Fabric version using 'peer version' or 'orderer version' commands
  2. 2. For Fabric v1.4.0: upgrade to v1.4.10 or later (the v1.4.10 release includes the security fix for this issue)
  3. 3. For Fabric v2.0.0 or v2.0.1: upgrade to v2.0.3 or later
  4. 4. For Fabric v2.3.0: upgrade to v2.3.3 or later
  5. 5. After upgrading, verify the fix by checking release notes to confirm the security patch for CVE-2021-43669 is included
  6. 6. Test the upgrade in a non-production environment before deploying to production orderers
  7. 7. Ensure backup of orderer data and configuration before performing the upgrade
  8. 8. Rolling upgrade is recommended for orderer clusters to maintain availability
Caveat Review release notes for any configuration or API changes between versions; some older client SDK versions may require updates for compatibility

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

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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-2021-43669 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
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