CVE-2018-13805

Severity: high (CVSS 7.5 v3.0)
Exploited in the wild: not listed in CISA KEV
EPSS: 1.6% probability of exploitation in the next 30 days
Public exploit or detection template: none known
Published: 2018-10-10 · updated 2026-06-17
Weakness: CWE-400

Description

A vulnerability has been identified in SIMATIC ET 200SP Open Controller (All versions >= V2.0 and < V2.1.6), SIMATIC S7-1500 Software Controller (All versions >= V2.0 and < V2.5), SIMATIC S7-1500 incl. F (All versions >= V2.0 and < V2.5). An attacker can cause a denial-of-service condition on the network stack by sending a large number of specially crafted packets to the PLC. The PLC will lose its ability to communicate over the network. This vulnerability could be exploited by an attacker with network access to the affected systems. Successful exploitation requires no privileges and no user interaction. An attacker could use this vulnerability to compromise availability of the network connectivity. At the time of advisory publication no public exploitation of this vulnerability was known.

Affected products

Siemens Simatic Et 200Sp Firmware: from 2.0
Siemens SIMATIC S7-1500 CPU: from 2.0 before 2.5 — fixed in 2.5
Siemens Simatic S7-1500F Firmware: from 2.0 before 2.5 — fixed in 2.5

How to fix

Upgrade to a fixed version: Siemens SIMATIC S7-1500 CPU 2.5; Siemens Simatic S7-1500F Firmware 2.5. Check the vendor advisory for mitigations.

References

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