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CVE-2021-43667

24
FAUCET Score

CVE-2021-43667 is a high-severity denial-of-service vulnerability affecting HyperLedger Fabric versions 1.4.0, 2.0.0, and 2.1.0. An unauthenticated attacker can remotely crash a leader node by sending a specially crafted message with a nil payload to the 'forwardToLeader' method. While the vulnerability has been patched by developers, there is currently no evidence of active exploitation, public exploit code, or significant community discussion surrounding it.

Impacted Technologies

VendorProductVersion(s)CPE
1.4.0CPE matchmatch criteria
cpe:2.3:a:linuxfoundation:fabric:1.4.0:*:*:*:*:*:*:*
2.0.0CPE matchmatch criteria
cpe:2.3:a:linuxfoundation:fabric:2.0.0:*:*:*:*:*:*:*
2.1.0CPE matchmatch criteria
cpe:2.3:a:linuxfoundation:fabric:2.1.0:*:*:*:*:*:*:*

CVSS Data

CVSS version used by this source: 3.1

7.5HIGH

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

Attack Vector
NETWORK
Attack Complexity
LOW
Privileges Required
NONE
User Interaction
NONE
Scope
UNCHANGED
Confidentiality Impact
NONE
Integrity Impact
NONE
Availability Impact
HIGH
Exploitability Score
3.9
Impact Score
3.6
CvssVersion
3.1

Exploit Intelligence

EPSS Score
1.29%
Probability of exploitation in next 30 days
EPSS Percentile
67.3%
Percentile rank of EPSS score among Peer Group
As of 2026-07-27
Model: v2026.06.15
This CVE's current EPSS score of 0.0129 is in the 47th percentile among its peer group of 51,551 CVEs.

Social Chatter

The average CVE in this peer group has 0.0 Twitter, 0.0 Reddit, 0.1 Bluesky, 0.1 Mastodon, and 0.4 GitHub mentions.

Media Mentions

No media coverage found for this CVE.

The average CVE in this peer group has 0.1 InfoSec Media, 0.0 Vendor Blog, and 0.0 Security Researcher mentions.

Remediation

Patch Available

Vendor Patches (3)

github_advisorypatch availablevia nvd_reference
View patch
gopatch availablevia ghsa
Product: github.com/hyperledger/fabricFixed in: 2.3.3
gopatch availablevia ghsa
Product: github.com/hyperledger/fabricFixed in: 2.2.4

Vendor Advisories (1)

goGHSA-vjj6-5m9f-wqjwhigh

NULL Pointer Dereference in HyperLedger Fabric

May 25, 2022

References

github.com / hyperledger/fabric/pull/2844
PatchThird Party Advisory
jira.hyperledger.org / browse/FAB-18529
ExploitVendor Advisory