CVE-2023-30755

Severity: medium (CVSS 4.4 v3.1)
Exploited in the wild: not listed in CISA KEV
EPSS: 0.4% probability of exploitation in the next 30 days
Public exploit or detection template: none known
Published: 2024-09-10 · updated 2026-06-17
Weakness: CWE-476

Description

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 the shutdown or reboot request, which could lead to the clean up of certain resources. This could allow a remote attacker with elevated 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): all versions
Siemens SIMATIC IPC DiagBase: all versions
Siemens SIMATIC IPC DiagMonitor: all versions
Siemens SIMATIC WinCC Runtime Advanced: all versions
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

How to fix

Upgrade to a fixed version: Siemens SIMATIC CP 1242-7 V2 (incl. SIPLUS variants) V3.5.20; Siemens SIMATIC CP 1243-1 DNP3 (incl. SIPLUS variants) V3.5.20; Siemens SIMATIC CP 1243-1 IEC (incl. SIPLUS variants) V3.5.20; Siemens SIMATIC CP 1243-1 (incl. SIPLUS variants) V3.5.20; Siemens SIMATIC CP 1243-7 LTE V3.5.20; Siemens SIMATIC CP 1243-8 IRC V3.5.20; Siemens SIPLUS TIM 1531 IRC V2.4.8; Siemens TIM 1531 IRC V2.4.8. Check the vendor advisory for mitigations.

References

https://cert-portal.siemens.com/productcert/html/ssa-423808.html

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