CVE-2023-30756: Siemens SIMATIC CP 1242-7 v2 Incl. Siplus Variants

Medium severity, CVSS 5.9. EPSS: 0.5% chance of exploitation in the next 30 days.

A vulnerability has been identified in SIMATIC CP 1242-7 V2 (incl. SIPLUS variants) (All versions < V3.5.20), SIMATIC CP 1243-1 (incl. SIPLUS variants) (All versions < V3.5.20), SIMATIC CP 1243-1 DNP3 (incl. SIPLUS variants) (All versions < V3.5.20), SIMATIC CP 1243-1 IEC (incl. SIPLUS variants) (All versions < V3.5.20), SIMATIC CP 1243-7 LTE (All versions < V3.5.20), SIMATIC CP 1243-8 IRC (6GK7243-8RX30-0XE0) (All versions < V3.5.20), SIMATIC HMI Comfort Panels (incl. SIPLUS variants) (All versions), SIMATIC IPC DiagBase (All versions), SIMATIC IPC DiagMonitor (All versions), SIMATIC WinCC Runtime Advanced (All versions), SIPLUS TIM 1531 IRC (6AG1543-1MX00-7XE0) (All versions < V2.4.8), TIM 1531 IRC (6GK7543-1MX00-0XE0) (All versions < V2.4.8). The web server of the affected devices do not properly handle certain errors when using the Expect HTTP request header, resulting in NULL dereference. This could allow a remote attacker with no privileges to cause a denial of service condition in the system.

Affected products

Siemens SIMATIC CP 1242-7 v2 Incl. Siplus Variants: before V3.5.20 (fixed in V3.5.20)
Siemens SIMATIC CP 1243-1 DNP3 Incl. Siplus Variants: before V3.5.20 (fixed in V3.5.20)
Siemens SIMATIC CP 1243-1 Iec Incl. Siplus Variants: before V3.5.20 (fixed in V3.5.20)
Siemens SIMATIC CP 1243-1 Incl. Siplus Variants: before V3.5.20 (fixed in V3.5.20)
Siemens SIMATIC CP 1243-7 Lte: before V3.5.20 (fixed in V3.5.20)
Siemens SIMATIC CP 1243-8 Irc: before V3.5.20 (fixed in V3.5.20)
Siemens SIMATIC HMI Comfort Panels Incl. Siplus Variants: any version
Siemens SIMATIC Ipc Diagbase: any version
Siemens SIMATIC Ipc Diagmonitor: any version
Siemens SIMATIC Wincc Runtime Advanced: any version
Siemens Siplus Tim 1531 Irc: before V2.4.8 (fixed in V2.4.8)
Siemens Tim 1531 Irc: before V2.4.8 (fixed in V2.4.8)

Published 2024-09-10. Last modified 2026-06-17.