CVE-2021-43669: HTTP Request Smuggling in github.com/hyperledger/fabric
Summary
CVE-2021-43669: HTTP Request Smuggling in github.com/hyperledger/fabric. Affects github.com/hyperledger/fabric versions < 2.4.0. Fixed in 2.4.0. How to fix ↓
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Background
HyperLedger Fabric is an open-source blockchain platform that provides a modular and extensible architecture for developing enterprise-grade blockchain applications. It is implemented in Go and offers features such as smart contracts, consensus algorithms, and permissioned networks. This vulnerability affects versions 1.4.0, 2.0.0, 2.0.1, and 2.3.0 of HyperLedger Fabric. The vulnerability allows an attacker to construct a message with an invalid header to the Order interface, leading to the potential breakdown of multiple orderers. The developers of Fabric have acknowledged and fixed this bug.
Vulnerability Detail
The vulnerability in HyperLedger Fabric allows an attacker to exploit a flaw in the handling of invalid headers in the Order interface. By crafting a message with an invalid header, the attacker can cause a breakdown of orderers. This vulnerability has the potential to disrupt the normal operation of the blockchain network and can be leveraged to cause denial-of-service attacks. The severity of this vulnerability is rated as HIGH with a CVSS score of 7.5.
How To Fix
Latest published version: v2.1.1+incompatible as of 23 Oct 2026
go get github.com/hyperledger/fabric@v2.1.1+incompatibleUpgrading to it may include breaking changes; the version below is the minimum fixed release for this vulnerability.
If you need the minimum change
2.4.0
This is the first release that contains the fix.
go get github.com/hyperledger/fabric@v2.4.0Tip — Not sure which version your app runs? Vulert can match this fix to it. Scan free →
Workaround
There is no specific workaround provided for this vulnerability. It is essential to update to the fixed version of HyperLedger Fabric to eliminate the risk of exploitation.
Conclusion
The vulnerability in HyperLedger Fabric can be exploited to cause disruption in the orderers of the blockchain network. It is crucial to update to the fixed version (2.4.0 or later) to mitigate the risk of exploitation. For further support and assistance in vulnerability remediation, please contact DevNack.com.
See every vulnerability recorded for github.com/hyperledger/fabric →
FAQ
HyperLedger Fabric is an open-source blockchain platform that provides a modular and extensible architecture for developing enterprise-grade blockchain applications.
Versions 1.4.0, 2.0.0, 2.0.1, and 2.3.0 of HyperLedger Fabric are affected by this vulnerability.
This vulnerability can be leveraged to cause denial-of-service attacks by breaking down multiple orderers in the HyperLedger Fabric network.
To fix this vulnerability, it is recommended to upgrade to version 2.4.0 or later of HyperLedger Fabric.
No specific workaround is provided for this vulnerability. Updating to the fixed version is the recommended solution.
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