CVE-2020-15791

Name: CVE-2020-15791
Creator: NVD / NIST
Published: 2020-09-09T19:15:20.663+00:00
License: https://creativecommons.org/publicdomain/zero/1.0/

MEDIUMCVSS 6.5/10EPSS 0.71%

Last modified Jun 17, 2026

CVE-2020-15791 is a medium-severity vulnerability rated 6.5/10 on the CVSS scale. A vulnerability has been identified in SIMATIC S7-300 CPU family (incl. related ET200 CPUs and SIPLUS variants) (All versions), SIMATIC S7-400 CPU family (incl. EPSS estimates a 0.71% chance of exploitation in the next 30 days.

Description

A vulnerability has been identified in SIMATIC S7-300 CPU family (incl. related ET200 CPUs and SIPLUS variants) (All versions), SIMATIC S7-400 CPU family (incl. SIPLUS variants) (All versions), SIMATIC WinAC RTX (F) 2010 (All versions), SINUMERIK 840D sl (All versions). The authentication protocol between a client and a PLC via port 102/tcp (ISO-TSAP) insufficiently protects the transmitted password. This could allow an attacker that is able to intercept the network traffic to obtain valid PLC credentials.

Metrics

CVSS 3.1

6.5/10

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

EPSS Probability

0.71%

48.9th percentile

Probability of exploitation in the next 30 days. Learn more

Weakness Enumeration

Affected Software

Vendor	Product	Versions
Siemens	Simatic S7-300 Cpu 312 Firmware	All versions
Siemens	Simatic S7-300 Cpu 314 Firmware	All versions
Siemens	Simatic S7-300 Cpu 315-2 Dp Firmware	All versions
Siemens	Simatic S7-300 Cpu 315-2 Pn Firmware	All versions
Siemens	Simatic S7-300 Cpu 317-2 Pn Firmware	All versions
Siemens	Simatic S7-300 Cpu 317-2 Dp Firmware	All versions
Siemens	Simatic S7-300 Cpu 315f-2 Dp Firmware	All versions
Siemens	Simatic S7-300 Cpu 315f-2 Pn Firmware	All versions
Siemens	Simatic S7-300 Cpu 317f-2 Pn Firmware	All versions
Siemens	Simatic S7-300 Cpu 317f-2 Dp Firmware	All versions
Siemens	Simatic S7-400 Cpu 412 Firmware	All versions
Siemens	Simatic S7-400 Cpu 414 Firmware	All versions
Siemens	Simatic S7-400 Cpu 416 Firmware	All versions
Siemens	Simatic S7-400 Cpu 417 Firmware	All versions

References

https://cert-portal.siemens.com/productcert/pdf/ssa-381684.pdfVendor Advisory
https://cert-portal.siemens.com/productcert/pdf/ssa-381684.pdfVendor Advisory

Timeline

Published: Sep 9, 2020
Last Modified: Jun 17, 2026
Status: Modified

Frequently Asked Questions

What is CVE-2020-15791?

How severe is CVE-2020-15791?

CVE-2020-15791 has a CVSS score of 6.5/10 (MEDIUM severity). The EPSS model estimates a 0.71% probability of exploitation in the next 30 days.

How do I fix CVE-2020-15791?

Check the vendor references and advisories linked above for patched versions and mitigation guidance. You can also run a Strix scan to test if your systems are affected.

Are you affected by CVE-2020-15791?

Run a free Strix scan to check your systems for this vulnerability.

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Source: NVD / NIST