CVE-2019-13939

Severity: medium (CVSS 4.8 v2.0)
Exploited in the wild: not listed in CISA KEV
EPSS: 0.7% probability of exploitation in the next 30 days
Public exploit or detection template: none known
Published: 2020-01-16 · updated 2026-06-17
Weakness: CWE-20

Description

A vulnerability has been identified in APOGEE MEC/MBC/PXC (P2) (All versions < V2.8.2), APOGEE PXC Compact (BACnet) (All versions < V3.5.3), APOGEE PXC Compact (P2 Ethernet) (All versions >= V2.8.2 < V2.8.19), APOGEE PXC Modular (BACnet) (All versions < V3.5.3), APOGEE PXC Modular (P2 Ethernet) (All versions >= V2.8.2 < V2.8.19), Capital Embedded AR Classic 431-422 (All versions), Capital Embedded AR Classic R20-11 (All versions < V2303), Desigo PXC00-E.D (All versions >= V2.3 < V6.0.327), Desigo PXC00-U (All versions >= V2.3x and < V6.00.327), Desigo PXC001-E.D (All versions >= V2.3 < V6.0.327), Desigo PXC100-E.D (All versions >= V2.3 < V6.0.327), Desigo PXC12-E.D (All versions >= V2.3 < V6.0.327), Desigo PXC128-U (All versions >= V2.3x and < V6.00.327), Desigo PXC200-E.D (All versions >= V2.3 < V6.0.327), Desigo PXC22-E.D (All versions >= V2.3 < V6.0.327), Desigo PXC22.1-E.D (All versions >= V2.3 < V6.0.327), Desigo PXC36.1-E.D (All versions >= V2.3 < V6.0.327), Desigo PXC50-E.D (All versions >= V2.3 < V6.0.327), Desigo PXC64-U (All versions >= V2.3x and < V6.00.327), Desigo PXM20-E (All versions >= V2.3 < V6.0.327), Nucleus NET (All versions), Nucleus ReadyStart V3 (All versions < V2017.02.3), Nucleus Source Code (All versions), SIMOTICS CONNECT 400 (All versions < V0.3.0.330), TALON TC Compact (BACnet) (All versions < V3.5.3), TALON TC Modular (BACnet) (All versions < V3.5.3). By sending specially crafted DHCP packets to a device where the DHCP client is enabled, an attacker could change the IP address of the device to an invalid value.

Affected products

Siemens Apogee Modular Building Controller Firmware: before 2.8.2 — fixed in 2.8.2
Siemens Apogee Modular Equiment Controller Firmware: before 2.8.2 — fixed in 2.8.2
Siemens Apogee Pxc Firmware: through 2.8.2
Siemens Capital VSTAR: all versions
Siemens Desigo Pxc00-E.D Firmware: from 2.3.0 before 6.00.327 — fixed in 6.00.327
Siemens Desigo Pxc00-U Firmware: from 2.3.0 before 6.00.327 — fixed in 6.00.327
Siemens Desigo Pxc001-E.D Firmware: from 2.3.0 before 6.00.327 — fixed in 6.00.327
Siemens Desigo Pxc12-E.D Firmware: from 2.3.0 before 6.00.327 — fixed in 6.00.327
Siemens Desigo Pxc22-E.D Firmware: from 2.3.0 before 6.00.327 — fixed in 6.00.327
Siemens Desigo Pxc22.1-E.D Firmware: from 2.3.0 before 6.00.327 — fixed in 6.00.327
Siemens Desigo Pxc36.1-E.D Firmware: from 2.3.0 before 6.00.327 — fixed in 6.00.327
Siemens Desigo Pxc Firmware: from 2.3
Siemens Desigo Pxm20 Firmware: from 2.3
Siemens Desigopxc100-E.D Firmware: all versions
Siemens Desigopxc128-U Firmware: all versions
Siemens Desigopxc200-E.D Firmware: all versions
Siemens Desigopxc50-E.D Firmware: all versions
Siemens Desigopxc64-U Firmware: all versions
Siemens Desigopxm20-E Firmware: all versions
Siemens Nucleus NET: all versions
Siemens Nucleus Readystart: before 2017.02.2 — fixed in 2017.02.2
Siemens Nucleus Rtos: all versions
Siemens Nucleus Safetycert: all versions
Siemens Nucleus Source Code: all versions
Siemens Simotics Connect 400 Firmware: through 0.3.0.95
Siemens Talon Tc Firmware: from 3.0

How to fix

Upgrade to a fixed version: Siemens Apogee Modular Building Controller Firmware 2.8.2; Siemens Apogee Modular Equiment Controller Firmware 2.8.2; Siemens Desigo Pxc00-E.D Firmware 6.00.327; Siemens Desigo Pxc00-U Firmware 6.00.327; Siemens Desigo Pxc001-E.D Firmware 6.00.327; Siemens Desigo Pxc12-E.D Firmware 6.00.327; Siemens Desigo Pxc22-E.D Firmware 6.00.327; Siemens Desigo Pxc22.1-E.D Firmware 6.00.327; Siemens Desigo Pxc36.1-E.D Firmware 6.00.327; Siemens Nucleus Readystart 2017.02.2. Check the vendor advisory for mitigations.

References

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