CVE-2025-40943: siemens simatic drive controller cpu 1504d tf Eval Injection

Vulnerability summary

CVE-2025-40943 is a critical (CVSS 9.6) Eval Injection vulnerability in siemens simatic drive controller cpu 1504d tf. EPSS estimates a 0.48% chance of exploitation in the next 30 days, higher than 39.6% of scored vulnerabilities.

Timeline

1. 10-03-2026
   PublishedVulnerability first disclosed.
2. 12-05-2026
   Last modifiedVulnerability information updated.

Description

Affected devices do not properly sanitize contents of trace files. This could allow an attacker to inject code through social engineering an authorized user, who has the function right "Read diagnostics", to import a specially crafted trace file. The malicious trace file is insufficiently sanitized and malicious code could be executed in the clients browser session and trigger PLC operations via the webserver that the legitimate user is authorized to perform.

• CWE-95Improper Neutralization of Directives in Dynamically Evaluated Code ('Eval Injection')The product receives input from an upstream component, but it does not neutralize or incorrectly neutralizes code syntax before using the input in a dynamic evaluation call (e.g. "eval").