{"cve":"CVE-2021-43669","nvd":{"published":"2021-11-18T16:15:09.323","modified":"2026-06-17T04:11:15.120","status":"Modified","description":"A vulnerability has been detected in HyperLedger Fabric v1.4.0, v2.0.0, v2.0.1, v2.3.0. It can easily break down as many orderers as the attacker wants. This bug can be leveraged by constructing a message whose header is invalid to the interface Order. This bug has been admitted and fixed by the developers of Fabric.","cvss_v4":null,"cvss_v3":{"version":"3.1","vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H","score":7.5},"cwes":["CWE-444"],"references":["https://github.com/hyperledger/fabric/pull/2828","https://jira.hyperledger.org/browse/FAB-18528","https://github.com/hyperledger/fabric/pull/2828","https://jira.hyperledger.org/browse/FAB-18528"],"products":["linuxfoundation:fabric"],"source":"nvd","synced_at":"2026-10-19T21:25:41.256909649+00:00"},"epss":{"cve":"CVE-2021-43669","score":0.01127,"percentile":0.66353,"date":"2026-11-01"},"kev":null,"osv":[{"id":"GHSA-j96p-r523-8r3w","url":"https://osv.dev/vulnerability/GHSA-j96p-r523-8r3w","summary":"HTTP Request Smuggling in github.com/hyperledger/fabric","modified":"2023-11-08T04:07:11.323394Z","packages":[{"ecosystem":"Go","name":"github.com/hyperledger/fabric","purl":"pkg:golang/github.com/hyperledger/fabric","ranges":["<2.4.0"],"fixed":["2.4.0"]}]}],"attribution":["This product uses the NVD API but is not endorsed or certified by the NVD.","EPSS scores: FIRST Exploit Prediction Scoring System, https://www.first.org/epss","Known exploited vulnerabilities: CISA Known Exploited Vulnerabilities Catalog, https://www.cisa.gov/known-exploited-vulnerabilities-catalog","Package advisories: OSV (https://osv.dev), from the GitHub Advisory Database, PyPA, Go, RustSec and other ecosystem databases, under CC-BY 4.0 or CC0","CVE records: the CVE Program's CVE List (https://www.cve.org), under its terms of use (https://www.cve.org/Legal/TermsOfUse). CVE is a registered trademark of The MITRE Corporation; this product is not affiliated with the CVE Program."]}