CVE-2021-43667

Exp

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 update: 2026-06-17 Assigner: [email protected] Source: [email protected]
NVD Status：Modified，CVE State: published
View at NVD, CVE.org, EUVD

CVE-2021-43667 is rated High Exploit Risk (69/100): CVSS High severity, with medium exploitation likelihood (EPSS 1.29%). 1 public exploit reference(s) are indexed (Exploit-DB). Public exploits are available—assess exposure, apply mitigations, and prioritize patching.

Risk is dynamic; we continuously reassess and refresh what is shown on this page as upstream context changes.

Public exploit references (Exploit-DB) for CVE-2021-43667

EDB-ID Source Kind Published Link
— nvd_ref exploit_tag Exploit-DB ↗

Exploit prediction scoring system (EPSS) score for CVE-2021-43667

EPSS lead: Daily EPSS estimates relative likelihood of exploitation; percentile ranks this CVE among scored vulnerabilities (higher = more severe relative rank).

# Date Old EPSS score New EPSS score Delta (New - Old)
1 2026-06-15 0.55% 1.29% +0.75%
2 2025-05-26 0.62% 0.55% -0.08%
3 2025-03-30 — 0.62% —

Full EPSS history (10 records total)

Common vulnerability scoring system (CVSS) metrics for CVE-2021-43667

CVSS metrics for this CVE.

Base score Version Severity Vector Exploitability Impact Score source
7.5 3.1 HIGH
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H Click to expand
Attack vector (AV:N)
Could be attacked over the internet or any normal routed network—not just someone sitting at the machine.
Attack complexity (AC:L)
Once they can reach the bug, pulling it off is straightforward—no weird race conditions or rare setup.
Privileges required (PR:N)
No account or special rights needed—anonymous or random user is enough.
User interaction (UI:N)
Nobody has to click “OK” or open a trap file; it can work without a victim helping.
Scope (S:U)
Damage stays in the same “trust bubble” as the broken component—no big spill into unrelated systems.
Confidentiality (C:N)
Doesn’t really leak secrets in a meaningful way.
Integrity (I:N)
Data isn’t meaningfully altered or forged.
Availability (A:H)
Could take the service down hard or make it unusable for people who depend on it.
 3.9 3.6 [email protected]
5.0 2.0 MEDIUM
AV:N/AC:L/Au:N/C:N/I:N/A:P Click to expand
Access vector (AV:N)
Can be exploited remotely over network reachability.
Access complexity (AC:L)
Exploitation conditions are straightforward and predictable.
Authentication (AU:N)
No authentication is required.
Confidentiality impact (C:N)
No confidentiality impact.
Integrity impact (I:N)
No integrity impact.
Availability impact (A:P)
Partial availability impact.
 10.0 2.9 [email protected]

Weakness enumeration for CVE-2021-43667

GitHub Security Advisory for CVE-2021-43667

GHSA-vjj6-5m9f-wqjw · Severity: high · Ecosystem: go — NULL Pointer Dereference in HyperLedger Fabric

Affected software / configurations for CVE-2021-43667

Vendor Product Version Raw CPE
linuxfoundation fabric 1.4.0 cpe:2.3:a:linuxfoundation:fabric:1.4.0:*:*:*:*:*:*:*
linuxfoundation fabric 2.0.0 cpe:2.3:a:linuxfoundation:fabric:2.0.0:*:*:*:*:*:*:*
linuxfoundation fabric 2.1.0 cpe:2.3:a:linuxfoundation:fabric:2.1.0:*:*:*:*:*:*:*

References for CVE-2021-43667

URL Tags
https://github.com/hyperledger/fabric/pull/2844 Patch Third Party Advisory
https://jira.hyperledger.org/browse/FAB-18529 Exploit Vendor Advisory
cvelogic Threat Intelligence