CVE-2020-25242

Name: CVE-2020-25242
Creator: NVD / NIST
Published: 2021-05-12T14:15:10.657+00:00
License: https://creativecommons.org/publicdomain/zero/1.0/

HIGHCVSS 7.5/10EPSS 1.27%

Last modified Jun 17, 2026

CVE-2020-25242 is a high-severity vulnerability rated 7.5/10 on the CVSS scale. A vulnerability has been identified in SIMATIC NET CP 343-1 Advanced (incl. SIPLUS variants) (All versions), SIMATIC NET CP 343-1 Lean (incl. EPSS estimates a 1.27% chance of exploitation in the next 30 days.

Description

A vulnerability has been identified in SIMATIC NET CP 343-1 Advanced (incl. SIPLUS variants) (All versions), SIMATIC NET CP 343-1 Lean (incl. SIPLUS variants) (All versions), SIMATIC NET CP 343-1 Standard (incl. SIPLUS variants) (All versions). Specially crafted packets sent to TCP port 102 could cause a Denial-of-Service condition on the affected devices. A cold restart might be necessary in order to recover.

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

1.27%

66.1th percentile

Probability of exploitation in the next 30 days. Learn more

Weakness Enumeration

CWE-400

Affected Software

Vendor	Product	Versions
Siemens	Simatic Net Cp 343-1 Advanced Firmware	All versions
Siemens	Simatic Net Cp 343-1 Lean Firmware	All versions
Siemens	Simatic Net Cp 343-1 Standard Firmware	All versions

References

https://cert-portal.siemens.com/productcert/pdf/ssa-676775.pdfVendor Advisory
https://cert-portal.siemens.com/productcert/pdf/ssa-676775.pdfVendor Advisory
https://cert-portal.siemens.com/productcert/pdf/ssa-676775.pdfVendor Advisory
https://cert-portal.siemens.com/productcert/pdf/ssa-676775.pdfVendor Advisory
https://us-cert.cisa.gov/ics/advisories/icsa-21-131-07Third Party Advisory, US Government Resource
https://cert-portal.siemens.com/productcert/pdf/ssa-676775.pdfVendor Advisory
https://cert-portal.siemens.com/productcert/pdf/ssa-676775.pdfVendor Advisory
https://cert-portal.siemens.com/productcert/pdf/ssa-676775.pdfVendor Advisory
https://cert-portal.siemens.com/productcert/pdf/ssa-676775.pdfVendor Advisory
https://us-cert.cisa.gov/ics/advisories/icsa-21-131-07Third Party Advisory, US Government Resource

Timeline

Published: May 12, 2021
Last Modified: Jun 17, 2026
Status: Modified

Frequently Asked Questions

What is CVE-2020-25242?

How severe is CVE-2020-25242?

CVE-2020-25242 has a CVSS score of 7.5/10 (HIGH severity). The EPSS model estimates a 1.27% probability of exploitation in the next 30 days.

How do I fix CVE-2020-25242?

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-2020-25242?

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

Scan your code now

Source: NVD / NIST