CVE-2025-24007 Siemens CVE debrief

Who should care

OT/ICS operators using Siemens SIRIUS 3RK3 Modular Safety System (MSS) or SIRIUS Safety Relays 3SK2, along with plant engineers, control-system administrators, and network/security teams responsible for segmenting industrial networks and protecting safety-related credentials.

Technical summary

The advisory describes a weakness in password handling rather than a software crash or code execution issue. Affected devices only provide weak password obfuscation; if an attacker has network access, they may retrieve the safety password and de-obfuscate it. The supplied CVSS vector is CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N, which aligns with a network-reachable confidentiality impact and no direct integrity or availability impact in the scoring provided. CISA lists affected products as Siemens SIRIUS 3RK3 Modular Safety System (MSS) and Siemens SIRIUS Safety Relays 3SK2.

Defensive priority

High. The issue is network-reachable, exposes a safety password, and has no fixed remediation for one affected product and none available for the other in the supplied advisory.

Recommended defensive actions

• Restrict network access to the PROFINET interface so only authorized systems can reach affected devices.
• Limit physical access to the affected devices to trusted personnel only.
• Review whether the safety password is exposed in an environment where network segmentation is weak or absent.
• Apply other defense-in-depth controls recommended for industrial control systems, especially access control, segmentation, and monitoring.
• Track Siemens and CISA advisory updates for any future remediation guidance, since the supplied advisory states no fix is planned for SIRIUS 3RK3 MSS and no fix is currently available for SIRIUS Safety Relays 3SK2.

Evidence notes

All core claims are drawn from the supplied CISA CSAF advisory data and its referenced Siemens advisory. The source text states: 'Affected devices only provide weak password obfuscation. An attacker with network access could retrieve and de-obfuscate the safety password used for protection against inadvertent operating errors.' The supplied advisory metadata lists affected products as Siemens SIRIUS 3RK3 Modular Safety System (MSS) and SIRIUS Safety Relays 3SK2, with CVSS vector CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N. Remediation entries in the corpus state limiting physical access and isolating the PROFINET interface, with no fix planned for one product and no fix available for the other.

Official resources