CVE-2021-22791: Schneider Electric Modicon m340 BMXP341000

Medium severity, CVSS 6.5. EPSS: 0.8% chance of exploitation in the next 30 days.

A CWE-787: Out-of-bounds Write vulnerability that could cause a Denial of Service on the Modicon PLC controller / simulator when updating the controller application with a specially crafted project file exists in Modicon M580 CPU (part numbers BMEP* and BMEH*, all versions), Modicon M340 CPU (part numbers BMXP34*, all versions), Modicon MC80 (part numbers BMKC80*, all versions), Modicon Momentum Ethernet CPU (part numbers 171CBU*, all versions), PLC Simulator for EcoStruxureª Control Expert, including all Unity Pro versions (former name of EcoStruxureª Control Expert, all versions), PLC Simulator for EcoStruxureª Process Expert including all HDCS versions (former name of EcoStruxureª Process Expert, all versions), Modicon Quantum CPU (part numbers 140CPU*, all versions), Modicon Premium CPU (part numbers TSXP5*, all versions).

Affected products

• Schneider Electric Modicon m340 BMXP341000: affected versions not specified
• Schneider Electric Modicon m340 BMXP342010: affected versions not specified
• Schneider Electric Modicon m340 BMXP342020: affected versions not specified
• Schneider Electric Modicon m340 BMXP342030: affected versions not specified
• Schneider Electric Modicon m580 BMEH582040: affected versions not specified
• Schneider Electric Modicon m580 BMEH582040C: affected versions not specified
• Schneider Electric Modicon m580 BMEH582040S: affected versions not specified
• Schneider Electric Modicon m580 BMEH584040: affected versions not specified
• Schneider Electric Modicon m580 BMEH584040C: affected versions not specified
• Schneider Electric Modicon m580 BMEH584040S: affected versions not specified
• Schneider Electric Modicon m580 BMEH586040: affected versions not specified
• Schneider Electric Modicon m580 BMEH586040C: affected versions not specified
• Schneider Electric Modicon m580 BMEH586040S: affected versions not specified
• Schneider Electric Modicon m580 BMEP581020: affected versions not specified
• Schneider Electric Modicon m580 BMEP581020H: affected versions not specified
• Schneider Electric Modicon m580 BMEP582020: affected versions not specified
• Schneider Electric Modicon m580 BMEP582020H: affected versions not specified
• Schneider Electric Modicon m580 BMEP582040: affected versions not specified
• Schneider Electric Modicon m580 BMEP582040H: affected versions not specified
• Schneider Electric Modicon m580 BMEP582040S: affected versions not specified
• Schneider Electric Modicon m580 BMEP583020: affected versions not specified
• Schneider Electric Modicon m580 BMEP583040: affected versions not specified
• Schneider Electric Modicon m580 BMEP584020: affected versions not specified
• Schneider Electric Modicon m580 BMEP584040: affected versions not specified
• Schneider Electric Modicon m580 BMEP584040S: affected versions not specified
• and 24 more

Published 2021-09-02. Last modified 2026-06-17.