Resource exhaustion in Siemens Simatic S7-Plcsim Advanced
CVE-2026-54429
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.
Published · last modified .
CVSS v3 metric
CVSS v3 base score 7.4 (High). Vector: CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:C/C:N/I:N/A:H.
EPSS exploit prediction
EPSS: 0.003 (17.5th percentile), scored .
Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 18th percentile — 17.5% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.
EPSS over last 30 days · oldest: 0.003 · newest: 0.003 · change: 0.000
Affected products
- Siemens Simatic S7-Plcsim Advanced — versions 0
Weakness classification (CWE)
References
Frequently asked questions
- What is CVE-2026-54429?
- CVE-2026-54429 is a high-severity vulnerability in Siemens Simatic S7-Plcsim Advanced, classified under Allocation of Resources Without Limits or Throttling. CVSS score: 7.4/10. Published 2026-07-14.
- How severe is CVE-2026-54429?
- High severity. CVSS v3 base score is 7.4 out of 10.