Siemens Patches Dozens of ICS Flaws
NCSC-NL advisory bundles over 40 Siemens vulnerabilities across Desigo, Reyrolle, SIMATIC, SCALANCE, SINAMICS and Siveillance, several rated critical, with vendor patches available.
Sourceadvisories.ncsc.nl — open the original
What to check
- Applies to
- The 40 CVEs named below. Whether you run an affected version is not assessed: check the versions the source lists.
- Exploitation
- CISA lists CVE-2026-31431 as exploited in the wild.
NCSC-NL published a consolidated advisory referencing 13 Siemens ProductCERT security advisories (SSA-019113 through SSA-503852) covering a broad range of industrial and building-automation products: Desigo, Reyrolle, SIMATIC, SCALANCE, SINAMICS and Siveillance. The bundle spans a wide array of weakness classes including path traversal, OS command injection, cross-site scripting, code injection, classic and stack-based buffer overflows, out-of-bounds read/write, integer overflow, missing authentication, cleartext transmission of sensitive data, insufficient entropy, unrestricted file upload, use of uninitialized variables, NULL pointer dereference, insecure defaults and weak password recovery mechanisms, among others.
Exploitation of the flaws could allow an attacker to cause denial-of-service, manipulate data, bypass security controls, execute remote code with either user or administrative/root privileges, access sensitive information, or escalate privileges. NCSC-NL notes that exploitation generally requires access to the production/OT environment, and reiterates standard guidance that such environments should not be exposed to the public internet. No in-the-wild exploitation is reported; this is a coordinated vendor patch release, and Siemens has issued updates for all affected products referenced in the linked SSAs.
Given the number of high/critical CVSS-rated flaws (several reaching 9.1–9.8) across widely deployed automation, protection-relay, HMI, networking and physical-security product lines, asset owners running affected Siemens products should prioritize inventory of exposed devices, apply vendor patches per the referenced SSAs, and verify OT/ICS network segmentation as a compensating control where patching is delayed.
Mentioned in this report
Source reporting: https://advisories.ncsc.nl/2026/ncsc-2026-0346.html
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