CVE-2021-22790: schneider-electric modicon_m340_bmxp341000_firmware Out-of-bounds Read

Vulnerability summary

CVE-2021-22790 is a medium (CVSS 6.5) Out-of-bounds Read vulnerability in schneider-electric modicon_m340_bmxp341000_firmware. EPSS estimates a 0.84% chance of exploitation in the next 30 days, higher than 57.1% of scored vulnerabilities.

Timeline

1. 02-09-2021
   PublishedVulnerability first disclosed.
2. 29-05-2026
   Last modifiedVulnerability information updated.

Description

A CWE-125: Out-of-bounds Read 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).

• CWE-125Out-of-bounds ReadThe product reads data past the end, or before the beginning, of the intended buffer.