Heap Allocation Leak in Siemens HMI Panels and SINAMICS Devices
CVE-2021-27386

7.5HIGH

Key Information:

Vendor: Siemens
Status: Simatic Hmi Comfort Outdoor Panels V15 7\" & 15\" (incl. Siplus Variants); Simatic Hmi Comfort Outdoor Panels V16 7\" & 15\" (incl. Siplus Variants); Simatic Hmi Comfort Panels V15 4\" - 22\" (incl. Siplus Variants); Simatic Hmi Comfort Panels V16 4\" - 22\" (incl. Siplus Variants)
Vendor: CVE Published:; 12 May 2021

What is CVE-2021-27386?

A vulnerability in Siemens SmartVNC affects several SIMATIC HMI and SINAMICS devices, resulting in a heap allocation leak in the device layout handler on the client side. This flaw can potentially cause a Denial-of-Service (DoS) condition, impacting device availability and operations. Affected products include various models of HMI Comfort Outdoor Panels, KTP Mobile Panels, WinCC Runtime, and multiple SINAMICS ranges. It is crucial for users and system administrators to address this vulnerability through updates and implement appropriate security measures to safeguard their systems.

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