CVE-2020-15783

Name: CVE-2020-15783
Creator: NVD / NIST
Published: 2020-11-12T20:15:16.343+00:00
License: https://creativecommons.org/publicdomain/zero/1.0/

HIGHCVSS 7.5/10EPSS 1.60%

Last modified Jun 17, 2026

CVE-2020-15783 is a high-severity vulnerability rated 7.5/10 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 TDC CPU555 (All versions), SINUMERIK 840D sl (All versions). EPSS estimates a 1.60% 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 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.

Metrics

CVSS 3.1

7.5/10

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

EPSS Probability

1.60%

72.7th percentile

Probability of exploitation in the next 30 days. Learn more

Weakness Enumeration

Affected Software

Vendor	Product	Versions
Siemens	Sinumerik 840d Sl Firmware	All 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 Tdc Cpu555 Firmware	All versions

References

https://cert-portal.siemens.com/productcert/pdf/ssa-492828.pdfMitigation, Vendor Advisory
https://cert-portal.siemens.com/productcert/pdf/ssa-492828.pdfMitigation, Vendor Advisory

Timeline

Published: Nov 12, 2020
Last Modified: Jun 17, 2026
Status: Modified

Frequently Asked Questions

What is CVE-2020-15783?

How severe is CVE-2020-15783?

CVE-2020-15783 has a CVSS score of 7.5/10 (HIGH severity). The EPSS model estimates a 1.60% probability of exploitation in the next 30 days.

How do I fix CVE-2020-15783?

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-2020-15783?

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

Scan your code now

Source: NVD / NIST