CVE-2021-43667 json
NULL Pointer Dereference in HyperLedger Fabric
published 2021-11-18 4 y ago modified 2026-06-17 4 mo ago also GHSA-vjj6-5m9f-wqjw , EUVD-2022-5370
- cvss
- 7.5
- version 3.1, NVD
- cisa kev
- Not listed
- not in CISA's catalog
- epss
- 1.3%
- EPSS 1.3% chance of exploitation in 30 days, percentile 71%
- public exploits
- 0
- none known
Summary
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.
Patch / fix
- go github.com/hyperledger/fabric 2.2.4, 2.3.3
- github.com/hyperledger/fabric#2838 commit
- github.com/hyperledger/fabric#2844 pull request
Exploit prediction
1.34% chance of exploitation in the next 30 days, higher than 71% of all scored CVEs (FIRST EPSS, 2026-11-08).
Exploits and checks
- jira.hyperledger.org https://jira.hyperledger.org/browse/FAB-18529 referenced PoC, tagged "exploit" by a source, unverified
CVSS scores
| assigned by | version | score | vector |
|---|---|---|---|
| NVD | 3.1 | 7.5 | CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H |
| NVD | 2.0 | 5.0 | AV:N/AC:L/Au:N/C:N/I:N/A:P |
| GitHub | 3.1 | 7.5 | CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H |
Affected packages
| ecosystem | package | affected | fixed in |
|---|---|---|---|
| go | github.com/hyperledger/fabric | >=2.3.0, <2.3.3 <2.2.4 |
2.3.3 2.2.4 |
Classification
- Weakness
-
- CWE-476 NULL Pointer Dereference
References
-
github.com
/hyperledger/fabric/pull/2844
web, patch, third-party-advisory
-
github.com
/hyperledger/fabric/pull/2838/commits/ebf94b10ecc86d3a91619b98befc52277b1e3474
web
-
jira.hyperledger.org
/browse/FAB-18529
web, exploit, vendor-advisory
-
nvd.nist.gov
/vuln/detail/CVE-2021-43667
advisory
Sources
- CVE List CVE-2021-43667
- GitHub Advisory GHSA-vjj6-5m9f-wqjw
- NVD CVE-2021-43667
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