CVE-2021-25662

A vulnerability has been identified in SIMATIC HMI Comfort Outdoor Panels V15 7\" & 15\" (incl. SIPLUS variants) (All versions < V15.1 Update 6), SIMATIC HMI Comfort Outdoor Panels V16 7\" & 15\" (incl. SIPLUS variants) (All versions < V16 Update 4), SIMATIC HMI Comfort Panels V15 4\" - 22\" (incl. SIPLUS variants) (All versions < V15.1 Update 6), SIMATIC HMI Comfort Panels V16 4\" - 22\" (incl. SIPLUS variants) (All versions < V16 Update 4), SIMATIC HMI KTP Mobile Panels V15 KTP400F, KTP700, KTP700F, KTP900 and KTP900F (All versions < V15.1 Update 6), SIMATIC HMI KTP Mobile Panels V16 KTP400F, KTP700, KTP700F, KTP900 and KTP900F (All versions < V16 Update 4), SIMATIC WinCC Runtime Advanced V15 (All versions < V15.1 Update 6), SIMATIC WinCC Runtime Advanced V16 (All versions < V16 Update 4). SmartVNC client fails to handle an exception properly if the program execution process is modified after sending a packet from the server, which could result in a Denial-of-Service condition.

• CWE-755

• https://cert-portal.siemens.com/productcert/pdf/ssa-538778.pdfVendor Advisory
• https://us-cert.cisa.gov/ics/advisories/icsa-21-131-12Third Party Advisory, US Government Resource
• https://cert-portal.siemens.com/productcert/pdf/ssa-538778.pdfVendor Advisory
• https://us-cert.cisa.gov/ics/advisories/icsa-21-131-12Third Party Advisory, US Government Resource

Published

May 12, 2021

Last Modified

Jun 17, 2026

Status

Modified