{"cve":"CVE-2019-6821","nvd":{"published":"2019-05-22T20:29:02.183","modified":"2026-06-17T02:39:44.433","status":"Modified","description":"CWE-330: Use of Insufficiently Random Values vulnerability, which could cause the hijacking of the TCP connection when using Ethernet communication in Modicon M580 firmware versions prior to V2.30, and all firmware versions of Modicon M340, Modicon Premium, Modicon Quantum.","cvss_v4":null,"cvss_v3":{"version":"3.1","vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:N","score":6.5},"cwes":["CWE-330"],"references":["http://www.securityfocus.com/bid/108366","https://ics-cert.us-cert.gov/advisories/ICSA-19-136-01","https://www.schneider-electric.com/en/download/document/SEVD-2019-134-03/","http://www.securityfocus.com/bid/108366","https://ics-cert.us-cert.gov/advisories/ICSA-19-136-01"],"products":["schneider-electric:modicon_m340_firmware","schneider-electric:modicon_m580_firmware","schneider-electric:modicon_premium_firmware","schneider-electric:modicon_quantum_firmware"],"source":"nvd","synced_at":"2026-10-19T20:56:19.218283075+00:00"},"epss":{"cve":"CVE-2019-6821","score":0.0193,"percentile":0.80003,"date":"2026-10-31"},"kev":null,"osv":[],"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."]}