CVE-2021-22787: Input Validation
A CWE-20: Improper Input Validation vulnerability exists that could cause denial of service of the device when an attacker sends a specially crafted HTTP request to the web server of the device. Affected Product: Modicon M340 CPUs: BMXP34 (Versions prior to V3.40), Modicon M340 X80 Ethernet Communication Modules: BMXNOE0100 (H), BMXNOE0110 (H), BMXNOC0401, BMXNOR0200H RTU (All Versions), Modicon Premium Processors with integrated Ethernet (Copro): TSXP574634, TSXP575634, TSXP576634 (All Versions), Modicon Quantum Processors with Integrated Ethernet (Copro): 140CPU65xxxxx (All Versions), Modicon Quantum Communication Modules: 140NOE771x1, 140NOC78x00, 140NOC77101 (All Versions), Modicon Premium Communication Modules: TSXETY4103, TSXETY5103 (All Versions)
Affected Software
Remediation
Event History
Frequently Asked Questions
What is CVE-2021-22787?
CVE-2021-22787 is a vulnerability that exists in Schneider-electric Modicon M340 CPUs prior to V3.40 and could lead to denial of service when an attacker sends a specially crafted HTTP request.
Which products are affected by CVE-2021-22787?
Modicon M340 CPUs with versions prior to V3.40 are affected by CVE-2021-22787.
What is the severity of CVE-2021-22787?
CVE-2021-22787 has a severity value of 7.5 (high).
How can an attacker exploit CVE-2021-22787?
An attacker can exploit CVE-2021-22787 by sending a specially crafted HTTP request to the web server of the affected device.
Is there a fix available for CVE-2021-22787?
Yes, updating the Modicon M340 CPU firmware to version V3.40 or later will fix CVE-2021-22787.