Siemens SIMATIC S7-PLCSIM Advanced Project Configuration allocation of resources

Summaryinfo

A vulnerability described as problematic has been identified in Siemens SIMATIC S7-PLCSIM Advanced. This affects an unknown part of the component Project Configuration Handler. Executing a manipulation can lead to allocation of resources. This vulnerability is tracked as CVE-2026-54429. The attack is only possible within the local network. No exploit exists.

Detailsinfo

A vulnerability has been found in Siemens SIMATIC S7-PLCSIM Advanced (unknown version) and classified as problematic. This vulnerability affects an unknown code block of the component Project Configuration Handler. The manipulation with an unknown input leads to a allocation of resources vulnerability. The CWE definition for the vulnerability is CWE-770. The product allocates a reusable resource or group of resources on behalf of an actor without imposing any restrictions on the size or number of resources that can be allocated, in violation of the intended security policy for that actor. As an impact it is known to affect availability. CVE summarizes:

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.

The advisory is shared for download at cert-portal.siemens.com. This vulnerability was named CVE-2026-54429 since 06/15/2026. The exploitation appears to be easy. Access to the local network is required for this attack. No form of authentication is required for a successful exploitation. There are neither technical details nor an exploit publicly available. The current price for an exploit might be approx. USD $0-$5k (estimation calculated on 07/14/2026).

There is no information about possible countermeasures known. It may be suggested to replace the affected object with an alternative product.

Once again VulDB remains the best source for vulnerability data.

Productinfo

Type

• SCADA Software

Vendor

• Siemens

Name

• SIMATIC S7-PLCSIM Advanced

License

• commercial

Website

• Vendor: https://www.siemens.com/

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