CVE-2026-54429 Denial of service in SIMATIC S7-PLCSIM Advanced
An unauthenticated local attacker can cause a denial-of-service condition in SIMATIC S7-PLCSIM Advanced by exhausting memory with high-volume multicast traffic.
- Exploited in the wild
- Not known
- Login needed
- Not needed
- Attackable
- Local or same network only
- Victim action needed
- Not needed
- Fix
- None listed
What is CVE-2026-54429?
CVE-2026-54429 is a medium-severity denial of service vulnerability in Siemens SIMATIC S7-PLCSIM Advanced, published on 14 Jul 2026. It can only be exploited from the same machine or local network, with no action from the victim.
Official description
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.
Weakness: CWE-770
Which versions are affected by CVE-2026-54429?
How do I fix CVE-2026-54429?
No fix has been published for CVE-2026-54429 yet. Limit exposure of the affected software until one is available.
Upgrade, then put limits on request size, rate and nesting depth so one client cannot exhaust the service. More about Denial of service.
Is CVE-2026-54429 being exploited?
There is no known exploitation of CVE-2026-54429 in the wild and no public exploit code.
Sources
Also known as GHSA-xhg3-q2f6-w8cg.