Siemens patches multiple SIMATIC, COMOS flaws
NCSC-NL relays Siemens patches for vulnerabilities in SIMATIC, COMOS and other products enabling RCE, privilege escalation and authentication bypass.
Sourceadvisories.ncsc.nl — open the original
What to check
- Applies to
- The 7 CVEs named below. Whether you run an affected version is not assessed: check the versions the source lists.
- Exploitation
- CISA lists CVE-2026-111497 as exploited in the wild.
NCSC-NL published advisory NCSC-2026-0479 summarizing Siemens security updates addressing multiple vulnerabilities across a range of industrial products, including SIMATIC and COMOS. The flaws span several weakness classes including OS command injection, improper code generation control, unchecked return values, improper certificate validation, CSRF, double-free, out-of-bounds write, binding to an unrestricted IP address, and weak authentication.
Successful exploitation could allow an attacker to cause denial-of-service conditions, manipulate or delete data, bypass security measures and authentication, gain unauthorized access to systems and sensitive data, execute remote code with user or administrator/root privileges, and escalate privileges. Seven CVEs are listed with CVSS v4 scores ranging up to 9.2 (CVE-2026-111497 and CVE-2026-112136), indicating some flaws are highly severe if exploited, though no in-the-wild exploitation is reported in this advisory.
Siemens has released security updates to remediate these issues across ten separate product security advisories (SSA) referenced in the bulletin. Defenders operating affected SIMATIC, COMOS, or other listed Siemens industrial/OT products should consult the linked Siemens ProductCERT advisories to identify specific affected versions and apply the corresponding patches promptly, prioritizing the highest-scoring CVEs.
Mentioned in this report
Source reporting: https://advisories.ncsc.nl/2026/ncsc-2026-0479.html
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