CVE-2020-15783 | BDVDB-2026-144694 Detail

SiemensSIMATIC S7-300 CPU family (incl. related ET200 CPUs and SIPLUS variants)

Description#

A vulnerability has been identified in SIMATIC S7-300 CPU family (incl. related ET200 CPUs and SIPLUS variants) (All versions), SIMATIC TDC CPU555 (All versions), SINUMERIK 840D sl (All versions). Sending multiple specially crafted packets to the affected devices could cause a Denial-of-Service on port 102. A cold restart is required to recover the service.

Impact#

Per CVSS v3.1: confidentiality impact none, integrity impact none, availability impact high. Attack vector: network.

Weaknesses#

CWE-400 Uncontrolled Resource Consumption

References#

https://cert-portal.siemens.com/productcert/pdf/ssa-492828.pdf

Exploit#

No public exploit known

History#

Version 12020-11-12Record published in the CVE List.
Version 22026-06-02Most recent update recorded in the CVE List.

Published

Published: 2020-11-12
Last modified: 2026-06-02

Vendor information

Vendor: Siemens
Product: SIMATIC S7-300 CPU family (incl. related ET200 CPUs and SIPLUS variants)

All Siemens vulnerabilities

Score

7.5 High

EPSS

1.6%, Low

Estimated chance of exploitation in the next 30 days. EPSS percentile: 76.7.

KEV

Not listed in the CISA Known Exploited Vulnerabilities catalog.

Impact

Denial of Service

Action

No specific action is recorded in the source data. Check the references for vendor guidance.

Affected Systems

Vulnerable
All versions
Fixed
Not stated

Scoring System

CVSS v4.0

Not available

CVSS v3.1

7.5 High

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

Metric breakdown
Attack Vector	Network
Attack Complexity	Low
Privileges Required	None
User Interaction	None
Scope	Unchanged
Confidentiality	None
Integrity	None
Availability	High

CVSS v3.0

Not available

CVSS v2

Not available

Source: CVE List v5 (record); CISA KEV (kev, action); FIRST EPSS (epss).