{"id":"CVE-2021-22816","aliases":["EUVD-2021-9951","GHSA-x4x8-fc23-7gg9"],"status":"published","title":"A CWE-754: Improper Check for Unusual or Exceptional Conditions vulnerability exists that could...","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","severity":{"version":"3.1","score":7.5,"vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H","level":"high","assessor":"primary","from":"nvd"},"epss":{"day":"2026-11-09","score":0.00947,"percentile":0.61399,"model":"v2026.06.15"},"facts":{"in_kev":false,"known_exploited":false,"public_exploit":false,"fix_available":false},"cwes":["CWE-754"],"published":"2022-01-28T19:09:41Z","modified":"2026-06-17T03:37:50Z","products":[{"vendor":"schneider-electric","product":"scadapack_312e_firmware"},{"vendor":"schneider-electric","product":"scadapack_313e_firmware"},{"vendor":"schneider-electric","product":"scadapack_314e_firmware"},{"vendor":"schneider-electric","product":"scadapack_330e_firmware"},{"vendor":"schneider-electric","product":"scadapack_333e_firmware"},{"vendor":"schneider-electric","product":"scadapack_334e_firmware"},{"vendor":"schneider-electric","product":"scadapack_337e_firmware"},{"vendor":"schneider-electric","product":"scadapack_350e_firmware"},{"vendor":"schneider-electric","product":"scadapack_357e_firmware"}],"references":[{"url":"https://download.schneider-electric.com/files?p_Doc_Ref=SEVD-2021-313-01","tags":["x_refsource_MISC","x_transferred","Vendor Advisory"]},{"url":"https://nvd.nist.gov/vuln/detail/CVE-2021-22816"},{"url":"https://github.com/advisories/GHSA-x4x8-fc23-7gg9"}],"sources":{"cve":[{"id":"CVE-2021-22816","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","status":"published","published":"2022-01-28T19:09:41Z","modified":"2024-08-03T18:51:07.524Z","updated_at":"2026-11-02T14:32:58.028461Z"}],"euvd":[{"id":"EUVD-2021-9951","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","status":"published","published":"2022-01-28T19:09:41Z","modified":"2024-08-03T18:51:07Z","updated_at":"2026-11-03T03:25:01.154097Z"}],"ghsa":[{"id":"GHSA-x4x8-fc23-7gg9","title":"A CWE-754: Improper Check for Unusual or Exceptional Conditions vulnerability exists that could...","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","status":"published","published":"2022-01-29T00:00:45Z","modified":"2023-02-03T05:05:14Z","cwes":["CWE-754"],"updated_at":"2026-11-02T14:53:42.435671Z"}],"nvd":[{"id":"CVE-2021-22816","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","status":"published","published":"2022-01-28T20:15:10.303Z","modified":"2026-06-17T03:37:50.747Z","cvss":[{"version":"3.1","score":7.5,"vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H","level":"high","assessor":"primary"},{"version":"2.0","score":7.8,"vector":"AV:N/AC:L/Au:N/C:N/I:N/A:C","level":"high","assessor":"primary"}],"cwes":["CWE-754"],"updated_at":"2026-11-02T14:07:04.178977Z"}]}}