Modicon m251 firmware

This hub aggregates every CVE we track for Modicon m251 firmware, a product in the ics ot iot space. Use it to gauge the current risk picture and drill into individual advisories.

Severity distribution

Monthly trend

The 10 most recently published vulnerabilities affecting Modicon m251 firmware.

• CVE-2025-13902CWE-79 Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting') vulnerability exists that could cause condition where authenticated attackers can have a victim’s brows...5.4Mar 10, 2026
• CVE-2025-13901CWE-404 Improper Resource Shutdown or Release vulnerability exists that could cause partial Denial of Service on Machine Expert protocol when an unauthenticated attacker sends malicious payload to ...5.3Mar 10, 2026
• CVE-2024-6528CWE-79: Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting') vulnerability exists that could cause a vulnerability leading to a cross-site scripting condition where ...5.4Jul 11, 2024
• CVE-2021-22699Improper Input Validation vulnerability exists in Modicon M241/M251 logic controllers firmware prior to V5.1.9.1 that could cause denial of service when specific crafted requests are sent to the co...7.5May 26, 2021
• CVE-2020-7488A CWE-319: Cleartext Transmission of Sensitive Information vulnerability exists which could leak sensitive information transmitted between the software and the Modicon M218, M241, M251, and M258 co...7.5Apr 22, 2020
• CVE-2020-7487A CWE-345: Insufficient Verification of Data Authenticity vulnerability exists which could allow the attacker to execute malicious code on the Modicon M218, M241, M251, and M258 controllers.9.8Apr 22, 2020
• CVE-2019-6820A CWE-306: Missing Authentication for Critical Function vulnerability exists which could cause a modification of device IP configuration (IP address, network mask and gateway IP address) when a spe...8.2May 22, 2019
• CVE-2017-6028An Insufficiently Protected Credentials issue was discovered in Schneider Electric Modicon PLCs Modicon M241, all firmware versions, and Modicon M251, all firmware versions. Log-in credentials are ...9.8Jun 30, 2017
• CVE-2017-6026A Use of Insufficiently Random Values issue was discovered in Schneider Electric Modicon PLCs Modicon M241, firmware versions prior to Version 4.0.5.11, and Modicon M251, firmware versions prior to...9.1Jun 30, 2017
• CVE-2017-6030Schneider Electric Modicon PLCs Predictable Value Range from Previous Values6.5Jun 30, 2017