Simatic S7 Can Opener V1.31 33 ~upd~ May 2026

[RESOURCE] Unlocking "Know-How Protection" in Simatic Manager: A Look at S7 Can Opener V1.31

Origins and Functionality

Modify or troubleshoot code when the original machinery supplier or system integrator is no longer available for support. Simplify Management:

Ethical and Legal Considerations

• Simatic S7 refers to Siemens programmable logic controllers (PLCs), widely used in critical infrastructure (power, water, manufacturing).
• "Can Opener" is the name given to a proof-of-concept exploit (released around 2019–2020) that bypasses the password protection / “know-how protection” on Siemens S7-300 and S7-400 PLCs. It allowed an attacker to read and modify protected proprietary blocks.
• Version numbers (V1.31, 33) suggest a specific compiled release of that tool, often shared in security research or clandestine contexts.

KNOW_HOW_PROTECT Removal

: Its primary function is to set or remove the "KNOW_HOW_PROTECT" keyword, allowing you to view and edit the source code of protected blocks. Simatic S7 Can Opener V1.31 33