CVE-2019-18336

What it is

A vulnerability has been identified in SIMATIC S7-300 CPU family (incl. related ET200 CPUs and SIPLUS variants) (All versions < V3.X.17), SIMATIC TDC CP51M1 (All versions < V1.1.8), SIMATIC TDC CPU555 (All versions < V1.1.1), SINUMERIK 840D sl (All versions < V4.8.6), SINUMERIK 840D sl (All versions < V4.94). Specially crafted packets sent to port 102/tcp (Profinet) could cause the affected device to go into defect mode. A restart is required in order to recover the system. Successful exploitation requires an attacker to have network access to port 102/tcp, with no authentication. No user interation is required. At the time of advisory publication no public exploitation of this security vulnerability was known.

At a glance

Exploitability

Can be exploited over the network without logging in. High risk of service disruption.

Exploit odds

1.7% chance of exploitation in the next 30 days (EPSS).

Fix

A patch, advisory or fixed version is referenced. Upgrade or apply it.

Timeline

1. 2020-03-10 20:15 UTC PublishedDisclosed publicly on CVE.org and NVD
2. 2026-06-17 02:24 UTC Last updatedMost recent change to the record

Why it ranks here

• Exploited in the wild: no, CISA does not list it.
• Exploit odds: 1.7% in the next 30 days (EPSS).
• Severity: 7.5 HIGH (CVSS).
• Fix: a patch or advisory is linked.

Details

Published

2020-03-10 20:15 UTC

Last modified

2026-06-17 02:24 UTC

Exploit probability

1.7% · EPSS, next 30 days

Weakness

CWE-400 · Uncontrolled resource consumption

Record status

Modified

Affected

• Siemens Simatic s7-300 Cpu Firmware < 3.3.17
• Siemens Simatic s7-300 Cpu 312 Ifm Firmware < 3.3.17
• Siemens Simatic s7-300 Cpu 313 Firmware < 3.3.17
• Siemens Simatic s7-300 Cpu 314 Firmware < 3.3.17
• Siemens Simatic s7-300 Cpu 314 Ifm Firmware < 3.3.17
• Siemens Simatic s7-300 Cpu 315 Firmware < 3.3.17
• Siemens Simatic s7-300 Cpu 315-2 Dp Firmware < 3.3.17
• Siemens Simatic s7-300 Cpu 316-2 Dp Firmware < 3.3.17

Attack profile CVSS 3.1 · 7.5

Attack vector

Network

Complexity

Low

Privileges needed

None

User interaction

None

Scope

Unchanged

Confidentiality

None

Integrity

None

Availability

High

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