CVE-2019-13940: Siemens s7-1200 CPU 1211c Firmware

High severity, CVSS 7.5. EPSS: 1.7% chance of exploitation in the next 30 days.

A vulnerability has been identified in SIMATIC ET 200pro IM154-8 PN/DP CPU (All versions < V3.X.17), SIMATIC ET 200pro IM154-8F PN/DP CPU (All versions < V3.X.17), SIMATIC ET 200pro IM154-8FX PN/DP CPU (All versions < V3.X.17), SIMATIC ET 200S IM151-8 PN/DP CPU (All versions < V3.X.17), SIMATIC ET 200S IM151-8F PN/DP CPU (All versions < V3.X.17), SIMATIC S7-1200 CPU family (incl. SIPLUS variants) (All versions < V4.1), SIMATIC S7-300 CPU 314C-2 PN/DP (All versions < V3.X.17), SIMATIC S7-300 CPU 315-2 PN/DP (All versions < V3.X.17), SIMATIC S7-300 CPU 315F-2 PN/DP (All versions < V3.X.17), SIMATIC S7-300 CPU 315T-3 PN/DP (All versions < V3.X.17), SIMATIC S7-300 CPU 317-2 PN/DP (All versions < V3.X.17), SIMATIC S7-300 CPU 317F-2 PN/DP (All versions < V3.X.17), SIMATIC S7-300 CPU 317T-3 PN/DP (All versions < V3.X.17), SIMATIC S7-300 CPU 317TF-3 PN/DP (All versions < V3.X.17), SIMATIC S7-300 CPU 319-3 PN/DP (All versions < V3.X.17), SIMATIC S7-300 CPU 319F-3 PN/DP (All versions < V3.X.17), SIMATIC S7-400 PN/DP V6 and below CPU family (incl. SIPLUS variants) (All versions), SIMATIC S7-400 PN/DP V7 CPU family (incl. SIPLUS variants) (All versions), SIMATIC WinAC RTX 2010 (All versions), SIMATIC WinAC RTX F 2010 (All versions), SIPLUS ET 200S IM151-8 PN/DP CPU (All versions < V3.X.17), SIPLUS ET 200S IM151-8F PN/DP CPU (All versions < V3.X.17), SIPLUS S7-300 CPU 314C-2 PN/DP (All versions < V3.X.17), SIPLUS S7-300 CPU 315-2 PN/DP (All versions < V3.X.17), SIPLUS S7-300 CPU 315F-2 PN/DP (All versions < V3.X.17), SIPLUS S7-300 CPU 317-2 PN/DP (All versions < V3.X.17), SIPLUS S7-300 CPU 317F-2 PN/DP (All versions < V3.X.17). Affected devices contain a vulnerability that could cause a denial of service condition of the web server by sending specially crafted HTTP requests to ports 80/tcp and 443/tcp. Beyond the web service, no other functions or interfaces are affected by the denial of service condition.

Affected products

Siemens s7-1200 CPU 1211c Firmware: before 4.1 (fixed in 4.1)
Siemens s7-1200 CPU 1212c Firmware: before 4.1 (fixed in 4.1)
Siemens s7-1200 CPU 1212fc Firmware: before 4.1 (fixed in 4.1)
Siemens s7-1200 CPU 1214c Firmware: before 4.1 (fixed in 4.1)
Siemens s7-1200 CPU 1214fc Firmware: before 4.1 (fixed in 4.1)
Siemens s7-1200 CPU 1215c Firmware: before 4.1 (fixed in 4.1)
Siemens s7-1200 CPU 1215fc Firmware: before 4.1 (fixed in 4.1)
Siemens s7-1200 CPU 1217c Firmware: before 4.1 (fixed in 4.1)
Siemens SIMATIC s7-300 CPU 315-2 Pn/dp Firmware: any version
Siemens SIMATIC s7-300 CPU 315-2dp Firmware: any version
Siemens SIMATIC s7-300 CPU 317-2 Dp Firmware: any version
Siemens SIMATIC s7-300 CPU 317-2 Pn/dp Firmware: any version
Siemens SIMATIC s7-300 CPU 319-3 Pn/dp Firmware: any version
Siemens SIMATIC s7-400 Pn/dp CPU Firmware: any version
Siemens SIMATIC Winac Rtx (f) 2010: any version
Siemens Siplus CPU 1211c Firmware: before 4.1 (fixed in 4.1)
Siemens Siplus CPU 1212c Firmware: before 4.1 (fixed in 4.1)
Siemens Siplus CPU 1214c Firmware: up to and including 4.1
Siemens Siplus CPU 1215c Firmware: before 4.1 (fixed in 4.1)
Siemens Siplus s7-1200 Firmware: before 4.1 (fixed in 4.1)
Siemens Siplus s7-300 CPU 314 Firmware: any version
Siemens Siplus s7-300 CPU 315-2 Dp Firmware: any version
Siemens Siplus s7-300 CPU 315-2 Pn/dp Firmware: any version
Siemens Siplus s7-300 CPU 317-2 Pn/dp Firmware: any version

Published 2020-02-11. Last modified 2026-06-17.