CVE-2025-11083 Siemens CVE debrief

Who should care

OT engineers, plant operators, and maintenance teams responsible for the listed Siemens SIMATIC S7-1500 CPU models; anyone with access to the device’s interactive shell; and teams that deploy or review applications running in the affected GNU/Linux subsystem.

Technical summary

The source corpus describes a heap-based buffer overflow in bfd/elfcode.h, specifically elf_swap_shdr, within GNU Binutils 2.45. In the Siemens advisory context, the affected exposure is tied to the additional GNU/Linux subsystem on the listed SIMATIC S7-1500 CPU models. The CVSS vector provided in the source is AV:L/AC:L/PR:L/UI:N/S:U/C:L/I:L/A:L (5.3), which indicates a local attack requiring some level of local access. Siemens’ stated mitigations are to limit interactive shell access to trusted personnel and only build and run applications from trusted sources.

Defensive priority

Medium. The attack path is local rather than remote, but the vulnerability is publicly disclosed and affects operational technology devices where local access may still be meaningful.

Recommended defensive actions

• Restrict interactive shell access on affected devices to trusted personnel only, as Siemens recommends.
• Only build and run applications from trusted sources on the affected GNU/Linux subsystem.
• Inventory the listed SIMATIC S7-1500 CPU variants and confirm whether the relevant subsystem is present and in use.
• Monitor Siemens ProductCERT and CISA updates for a product fix; the supplied Siemens advisory currently lists no fix available.
• If you also run upstream GNU Binutils outside Siemens products, move to a release that includes the 2.46 fix noted in the CVE description.

Evidence notes

The supplied sources are consistent on the core vulnerability mechanics: a heap-based buffer overflow in GNU Binutils' elf_swap_shdr, with local attack conditions and public disclosure noted in the CVE record. The Siemens/CISA CSAF advisory maps the CVE to specific SIMATIC S7-1500 CPU product variants and provides mitigation guidance, but its remediation list says no fix is currently available for those products. The CVE description separately notes that the maintainer said the issue was '[f]ixed for 2.46,' which should be treated as upstream Binutils context rather than a Siemens product patch status.

Official resources