CVE-2026-54429: Medium severity Siemens Simatic S7-plcsim Advanced vulnerability
A vulnerability has been identified in SIMATIC S7-PLCSIM Advanced (All versions). Affected devices do not properly handle high-volume multicast network traffic, which can exhaust available memory resources in the affected application. This could allow an unauthenticated attacker on the local network segment to cause a denial-of-service condition of the affected application. The affected application becomes inaccessible and requires a manual restart; no project data is lost. Successful exploitation requires a specific project configuration to be already active on the targeted instance.
Affected Software
Event History
Frequently Asked Questions
What is the severity of CVE-2026-54429?
The severity of CVE-2026-54429 is classified as high with a score of 7.4.
What is CVE-2026-54429 related to?
CVE-2026-54429 is related to a vulnerability in SIMATIC S7-PLCSIM Advanced that allows for improper handling of high-volume multicast network traffic.
How do I fix CVE-2026-54429?
To fix CVE-2026-54429, it is recommended to apply available software patches or updates from Siemens for SIMATIC S7-PLCSIM Advanced.
What can an attacker achieve with CVE-2026-54429?
An unauthenticated attacker on the local network can potentially exhaust available memory resources within the affected application.
Which versions of Siemens software are affected by CVE-2026-54429?
All versions of Siemens SIMATIC S7-PLCSIM Advanced are affected by CVE-2026-54429.