CVE-2019-13940

Severity: high (CVSS 7.5 v3.1)
Exploited in the wild: not listed in CISA KEV
EPSS: 1.7% probability of exploitation in the next 30 days
Public exploit or detection template: none known
Published: 2020-02-11 · updated 2026-06-17
Weakness: CWE-400

Description

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: all versions
Siemens Simatic S7-300 Cpu 315-2Dp Firmware: all versions
Siemens Simatic S7-300 Cpu 317-2 Dp Firmware: all versions
Siemens Simatic S7-300 Cpu 317-2 Pn/Dp Firmware: all versions
Siemens Simatic S7-300 Cpu 319-3 Pn/Dp Firmware: all versions
Siemens Simatic S7-400 Pn/Dp Cpu Firmware: all versions
Siemens AG SIMATIC WinAC RTX (F) 2010: all versions
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: through 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: all versions
Siemens Siplus S7-300 Cpu 315-2 Dp Firmware: all versions
Siemens Siplus S7-300 Cpu 315-2 Pn/Dp Firmware: all versions
Siemens Siplus S7-300 Cpu 317-2 Pn/Dp Firmware: all versions

How to fix

Upgrade to a fixed version: Siemens S7-1200 Cpu 1211C Firmware 4.1; Siemens S7-1200 Cpu 1212C Firmware 4.1; Siemens S7-1200 Cpu 1212Fc Firmware 4.1; Siemens S7-1200 Cpu 1214C Firmware 4.1; Siemens S7-1200 Cpu 1214Fc Firmware 4.1; Siemens S7-1200 Cpu 1215C Firmware 4.1; Siemens S7-1200 Cpu 1215Fc Firmware 4.1; Siemens S7-1200 Cpu 1217C Firmware 4.1; Siemens Siplus Cpu 1211C Firmware 4.1; Siemens Siplus Cpu 1212C Firmware 4.1; Siemens Siplus Cpu 1215C Firmware 4.1; Siemens Siplus S7-1200 Firmware 4.1. Check the vendor advisory for mitigations.

References

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