{"cve":"CVE-2021-22779","nvd":{"published":"2021-07-14T15:15:08.240","modified":"2026-06-17T03:37:45.570","status":"Modified","description":"Authentication Bypass by Spoofing vulnerability exists in EcoStruxure Control Expert (all versions prior to V15.0 SP1, including all versions of Unity Pro), EcoStruxure Control Expert V15.0 SP1, EcoStruxure Process Expert (all versions, including all versions of EcoStruxure Hybrid DCS), SCADAPack RemoteConnect for x70 (all versions), Modicon M580 CPU (all versions - part numbers BMEP* and BMEH*), Modicon M340 CPU (all versions - part numbers BMXP34*), that could cause unauthorized access in read and write mode to the controller by spoofing the Modbus communication between the engineering software and the controller.","cvss_v4":null,"cvss_v3":{"version":"3.1","vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:N","score":9.1},"cwes":["CWE-290"],"references":["http://download.schneider-electric.com/files?p_Doc_Ref=SEVD-2021-194-01","http://download.schneider-electric.com/files?p_Doc_Ref=SEVD-2021-194-01"],"products":["schneider-electric:ecostruxure_control_expert","schneider-electric:ecostruxure_process_expert","schneider-electric:modicon_m340_bmxp341000_firmware","schneider-electric:modicon_m340_bmxp342010_firmware","schneider-electric:modicon_m340_bmxp342020_firmware","schneider-electric:modicon_m340_bmxp342030_firmware","schneider-electric:modicon_m580_bmeh582040_firmware","schneider-electric:modicon_m580_bmeh582040c_firmware","schneider-electric:modicon_m580_bmeh582040s_firmware","schneider-electric:modicon_m580_bmeh584040_firmware","schneider-electric:modicon_m580_bmeh584040c_firmware","schneider-electric:modicon_m580_bmeh584040s_firmware","schneider-electric:modicon_m580_bmeh586040_firmware","schneider-electric:modicon_m580_bmeh586040c_firmware","schneider-electric:modicon_m580_bmeh586040s_firmware","schneider-electric:modicon_m580_bmep581020_firmware","schneider-electric:modicon_m580_bmep581020h_firmware","schneider-electric:modicon_m580_bmep582020_firmware","schneider-electric:modicon_m580_bmep582020h_firmware","schneider-electric:modicon_m580_bmep582040_firmware","schneider-electric:modicon_m580_bmep582040h_firmware","schneider-electric:modicon_m580_bmep582040s_firmware","schneider-electric:modicon_m580_bmep583020_firmware","schneider-electric:modicon_m580_bmep583040_firmware","schneider-electric:modicon_m580_bmep584020_firmware","schneider-electric:modicon_m580_bmep584040_firmware","schneider-electric:modicon_m580_bmep584040s_firmware","schneider-electric:modicon_m580_bmep585040_firmware","schneider-electric:modicon_m580_bmep585040c_firmware","schneider-electric:modicon_m580_bmep586040_firmware","schneider-electric:modicon_m580_bmep586040c_firmware","schneider-electric:remoteconnect"],"source":"nvd","synced_at":"2026-10-19T21:21:13.713336758+00:00"},"epss":{"cve":"CVE-2021-22779","score":0.01051,"percentile":0.64309,"date":"2026-11-01"},"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."]}