CVE-2021-43667

Name: CVE-2021-43667
Creator: NVD / NIST
Published: 2021-11-18T16:15:09.073+00:00
License: https://creativecommons.org/publicdomain/zero/1.0/

HIGHCVSS 7.5/10EPSS 1.29%

Last modified Jun 17, 2026

CVE-2021-43667 is a high-severity vulnerability rated 7.5/10 on the CVSS scale. A vulnerability has been detected in HyperLedger Fabric v1.4.0, v2.0.0, v2.1.0. This bug can be leveraged by constructing a message whose payload is nil and sending this message with the method 'forwardToLeader'. EPSS estimates a 1.29% chance of exploitation in the next 30 days.

Description

A vulnerability has been detected in HyperLedger Fabric v1.4.0, v2.0.0, v2.1.0. This bug can be leveraged by constructing a message whose payload is nil and sending this message with the method 'forwardToLeader'. This bug has been admitted and fixed by the developers of Fabric. If leveraged, any leader node will crash.

Metrics

CVSS 3.1

7.5/10

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

EPSS Probability

1.29%

66.7th percentile

Probability of exploitation in the next 30 days. Learn more

Weakness Enumeration

CWE-476

Affected Software

Vendor	Product	Versions
Linuxfoundation	Fabric	1.4.0
Linuxfoundation	Fabric	2.0.0
Linuxfoundation	Fabric	2.1.0

References

https://github.com/hyperledger/fabric/pull/2844Patch, Third Party Advisory
https://jira.hyperledger.org/browse/FAB-18529Exploit, Vendor Advisory
https://github.com/hyperledger/fabric/pull/2844Patch, Third Party Advisory
https://jira.hyperledger.org/browse/FAB-18529Exploit, Vendor Advisory

Timeline

Published: Nov 18, 2021
Last Modified: Jun 17, 2026
Status: Modified

Frequently Asked Questions

What is CVE-2021-43667?

How severe is CVE-2021-43667?

CVE-2021-43667 has a CVSS score of 7.5/10 (HIGH severity). The EPSS model estimates a 1.29% probability of exploitation in the next 30 days.

How do I fix CVE-2021-43667?

Check the vendor references and advisories linked above for patched versions and mitigation guidance. You can also run a Strix scan to test if your systems are affected.

Are you affected by CVE-2021-43667?

Run a free Strix scan to check your systems for this vulnerability.

Scan your code now

Source: NVD / NIST