{"cve":"CVE-2021-22816","nvd":{"published":"2022-01-28T20:15:10.303","modified":"2026-06-17T03:37:50.747","status":"Modified","description":"A CWE-754: Improper Check for Unusual or Exceptional Conditions vulnerability exists that could cause a Denial of Service of the RTU when receiving a specially crafted request over Modbus, and the RTU is configured as a Modbus server. Affected Products: SCADAPack 312E, 313E, 314E, 330E, 333E, 334E, 337E, 350E and 357E RTUs with firmware V8.18.1 and prior","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-754"],"references":["https://download.schneider-electric.com/files?p_Doc_Ref=SEVD-2021-313-01","https://download.schneider-electric.com/files?p_Doc_Ref=SEVD-2021-313-01"],"products":["schneider-electric:scadapack_312e_firmware","schneider-electric:scadapack_313e_firmware","schneider-electric:scadapack_314e_firmware","schneider-electric:scadapack_330e_firmware","schneider-electric:scadapack_333e_firmware","schneider-electric:scadapack_334e_firmware","schneider-electric:scadapack_337e_firmware","schneider-electric:scadapack_350e_firmware","schneider-electric:scadapack_357e_firmware"],"source":"nvd","synced_at":"2026-10-19T21:27:20.926095847+00:00"},"epss":{"cve":"CVE-2021-22816","score":0.00947,"percentile":0.61156,"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."]}