What is CVE-2021-43667?

CVE-2021-43667 is a high-severity vulnerability in Linuxfoundation Fabric, classified under NULL Pointer Dereference. CVSS score: 7.5/10. Published 2021-11-18.

How severe is CVE-2021-43667?

High severity. CVSS v3 base score is 7.5 out of 10.

NULL pointer dereference in Linuxfoundation Fabric

CVE-2021-43667

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.

Published 2021-11-18 · last modified 2026-06-17.

CVSS v3 metric

CVSS v3 base score 7.5 (High). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H.

EPSS exploit prediction

EPSS: 0.013 (70.1th percentile), scored 2026-09-30.

Low probability of exploitation in the next 30 days, but still tracked. 70th percentile — 70.1% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.

EPSS over last 30 days · oldest: 0.013 · newest: 0.013 · change: +0.000

Affected products

Linuxfoundation Fabric — versions 1.4.0, 2.0.0, 2.1.0

Weakness classification (CWE)

CWE-476 — NULL Pointer Dereference

References

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

Frequently asked questions

What is CVE-2021-43667?: CVE-2021-43667 is a high-severity vulnerability in Linuxfoundation Fabric, classified under NULL Pointer Dereference. CVSS score: 7.5/10. Published 2021-11-18.
How severe is CVE-2021-43667?: High severity. CVSS v3 base score is 7.5 out of 10.