Schneider Electric Modicon m251 Firmware vulnerabilities

10 CVEs affecting Schneider Electric Modicon m251 Firmware, 0 known to be exploited (CISA KEV), with EPSS scores. Latest: CVE-2025-13902, published 2026-03-10.

Highest priority

Known exploited (CISA KEV) first, then by EPSS exploit probability.

CVE-2017-6026, published 2017-06-30. Critical severity, CVSS 9.1. EPSS: 31.8% chance of exploitation in the next 30 days. A 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…
CVE-2017-6028, published 2017-06-30. Critical severity, CVSS 9.8. EPSS: 2.3% chance of exploitation in the next 30 days. An 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…
CVE-2017-6030, published 2017-06-30. Medium severity, CVSS 6.5. EPSS: 2.1% chance of exploitation in the next 30 days. A predictable value range from previous values issue was discovered in Schneider Electric Modicon PLCs Modicon M221, firmware versions prior to Version 1.5.0.0, Modicon M241, firmware versions prior…
CVE-2019-6820, published 2019-05-22. High severity, CVSS 8.2. EPSS: 1.3% chance of exploitation in the next 30 days. A 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…
CVE-2021-22699, published 2021-05-26. High severity, CVSS 7.5. EPSS: 1% chance of exploitation in the next 30 days. Improper 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…
CVE-2020-7488, published 2020-04-22. High severity, CVSS 7.5. EPSS: 0.9% chance of exploitation in the next 30 days. A 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…
CVE-2020-7487, published 2020-04-22. Critical severity, CVSS 9.8. EPSS: 0.7% chance of exploitation in the next 30 days. A 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.
CVE-2025-13901, published 2026-03-10. Medium severity, CVSS 5.3. EPSS: 0.5% chance of exploitation in the next 30 days. CWE-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…
CVE-2024-6528, published 2024-07-11. Medium severity, CVSS 6.1. EPSS: 0.3% chance of exploitation in the next 30 days. CWE-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…
CVE-2025-13902, published 2026-03-10. Medium severity, CVSS 5.4. EPSS: 0.2% chance of exploitation in the next 30 days. CWE-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 browser…