Modicon M251 Firmware
Monthly
Cross-site scripting in Schneider Electric Modicon PLC embedded web servers (M258, LMC058, M251, M241) allows authenticated low-privilege attackers to inject persistent JavaScript payloads that execute in a victim engineer's browser upon hovering over a crafted element. In industrial OT environments, successful exploitation could compromise engineering workstation sessions, steal credentials used to configure programmable logic controllers, or manipulate displayed process data. No public exploit code exists and the CVE is absent from CISA KEV; EPSS at 0.05% (14th percentile) confirms low current exploitation likelihood, though the ICS context elevates operational consequence beyond what raw scores suggest.
Partial Denial of Service against Schneider Electric Modicon M241, M251, and M262 programmable logic controllers (PLCs) is achievable by unauthenticated remote attackers via the Machine Expert programming protocol. Exploitation requires only network reachability to the affected PLC - no credentials or user interaction - allowing an attacker to send malformed payloads that exhaust active communication channels through improper resource release (CWE-404). No public exploit code exists and EPSS is very low (0.05%), but the network-accessible attack surface with zero authentication in OT environments elevates operational risk beyond the Medium CVSS rating suggests.
Scripting') vulnerability exists that could cause a vulnerability leading to a cross-site scripting condition where attackers can have a victim’s browser run arbitrary JavaScript when they visit a. Rated medium severity (CVSS 6.1), this vulnerability is remotely exploitable, no authentication required, low attack complexity. No vendor patch available.
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. Rated high severity (CVSS 7.5), this vulnerability is remotely exploitable, no authentication required, low attack complexity. No vendor patch available.
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. Rated high severity (CVSS 7.5), this vulnerability is remotely exploitable, no authentication required, low attack complexity. No vendor patch available.
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. Rated critical severity (CVSS 9.8), this vulnerability is remotely exploitable, no authentication required, low attack complexity. No vendor patch available.
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. Rated high severity (CVSS 8.2), this vulnerability is remotely exploitable, no authentication required, low attack complexity. No vendor patch available.
An Insufficiently Protected Credentials issue was discovered in Schneider Electric Modicon PLCs Modicon M241, all firmware versions, and Modicon M251, all firmware versions. Rated critical severity (CVSS 9.8), this vulnerability is remotely exploitable, no authentication required, low attack complexity. No vendor patch available.
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. Rated critical severity (CVSS 9.1), this vulnerability is remotely exploitable, no authentication required, low attack complexity. Public exploit code available and EPSS exploitation probability 18.6%.
Cross-site scripting in Schneider Electric Modicon PLC embedded web servers (M258, LMC058, M251, M241) allows authenticated low-privilege attackers to inject persistent JavaScript payloads that execute in a victim engineer's browser upon hovering over a crafted element. In industrial OT environments, successful exploitation could compromise engineering workstation sessions, steal credentials used to configure programmable logic controllers, or manipulate displayed process data. No public exploit code exists and the CVE is absent from CISA KEV; EPSS at 0.05% (14th percentile) confirms low current exploitation likelihood, though the ICS context elevates operational consequence beyond what raw scores suggest.
Partial Denial of Service against Schneider Electric Modicon M241, M251, and M262 programmable logic controllers (PLCs) is achievable by unauthenticated remote attackers via the Machine Expert programming protocol. Exploitation requires only network reachability to the affected PLC - no credentials or user interaction - allowing an attacker to send malformed payloads that exhaust active communication channels through improper resource release (CWE-404). No public exploit code exists and EPSS is very low (0.05%), but the network-accessible attack surface with zero authentication in OT environments elevates operational risk beyond the Medium CVSS rating suggests.
Scripting') vulnerability exists that could cause a vulnerability leading to a cross-site scripting condition where attackers can have a victim’s browser run arbitrary JavaScript when they visit a. Rated medium severity (CVSS 6.1), this vulnerability is remotely exploitable, no authentication required, low attack complexity. No vendor patch available.
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. Rated high severity (CVSS 7.5), this vulnerability is remotely exploitable, no authentication required, low attack complexity. No vendor patch available.
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. Rated high severity (CVSS 7.5), this vulnerability is remotely exploitable, no authentication required, low attack complexity. No vendor patch available.
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. Rated critical severity (CVSS 9.8), this vulnerability is remotely exploitable, no authentication required, low attack complexity. No vendor patch available.
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. Rated high severity (CVSS 8.2), this vulnerability is remotely exploitable, no authentication required, low attack complexity. No vendor patch available.
An Insufficiently Protected Credentials issue was discovered in Schneider Electric Modicon PLCs Modicon M241, all firmware versions, and Modicon M251, all firmware versions. Rated critical severity (CVSS 9.8), this vulnerability is remotely exploitable, no authentication required, low attack complexity. No vendor patch available.
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. Rated critical severity (CVSS 9.1), this vulnerability is remotely exploitable, no authentication required, low attack complexity. Public exploit code available and EPSS exploitation probability 18.6%.