CVE-2024-42161 Siemens CVE debrief

Who should care

OT/ICS operators, Siemens SIMATIC S7-1500 TM MFP users, engineering teams managing BIOS or application supply chains for this platform, and defenders responsible for Linux-based embedded components in industrial environments.

Technical summary

The source advisory maps CVE-2024-42161 to Siemens SIMATIC S7-1500 TM MFP - BIOS and gives a CVSS 3.1 vector of AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H (7.8 HIGH). The CVE description states that the Linux kernel issue is an uninitialized-value bug in BPF_CORE_READ_BITFIELD. The corpus does not provide a device-specific exploitation path, only that the advisory currently has no available fix and advises building and running applications only from trusted sources.

Defensive priority

High

Recommended defensive actions

• Restrict the platform to trusted, vetted applications and update channels only.
• Monitor Siemens and CISA advisories for a vendor fix or updated mitigation guidance.
• Review whether the affected BIOS/platform is exposed to untrusted local code execution paths or software supply-chain risks.
• Apply compensating controls from CISA ICS recommended practices where feasible, including least privilege and application trust controls.

Evidence notes

Evidence is limited to the supplied CSAF advisory and linked official references. The advisory explicitly lists Siemens as the vendor, SIMATIC S7-1500 TM MFP - BIOS as the affected product, and states that no fix is available. The description field references a Linux kernel BPF_CORE_READ_BITFIELD uninitialized-value issue, but the corpus does not supply additional device-specific impact details, so no further exploitation claims are made.

Official resources