CVE-2020-25241

Name: CVE-2020-25241
Creator: NVD / NIST
Published: 2021-03-15T17:15:20.097+00:00
License: https://creativecommons.org/publicdomain/zero/1.0/

HIGHCVSS 7.5/10EPSS 1.03%

Last modified Jun 17, 2026

CVE-2020-25241 is a high-severity vulnerability rated 7.5/10 on the CVSS scale. A vulnerability has been identified in SIMATIC MV400 family (All Versions < V7.0.6). The underlying TCP stack of the affected products does not correctly validate the sequence number for incoming TCP RST packages. EPSS estimates a 1.03% chance of exploitation in the next 30 days.

Description

A vulnerability has been identified in SIMATIC MV400 family (All Versions < V7.0.6). The underlying TCP stack of the affected products does not correctly validate the sequence number for incoming TCP RST packages. An attacker could exploit this to terminate arbitrary TCP sessions.

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

1.03%

59.4th percentile

Probability of exploitation in the next 30 days. Learn more

Weakness Enumeration

Affected Software

Vendor	Product	Versions
Siemens	Simatic Mv440 Sr Firmware	< 7.0.6
Siemens	Simatic Mv440 Hr Firmware	< 7.0.6
Siemens	Simatic Mv440 Ur Firmware	< 7.0.6
Siemens	Simatic Mv420 Sr-B Firmware	< 7.0.6
Siemens	Simatic Mv420 Sr-P Firmware	< 7.0.6
Siemens	Simatic Mv420 Sr-B Body Firmware	< 7.0.6
Siemens	Simatic Mv420 Sr-P Body Firmware	< 7.0.6

References

https://cert-portal.siemens.com/productcert/pdf/ssa-599268.pdfVendor Advisory
https://cert-portal.siemens.com/productcert/pdf/ssa-599268.pdfVendor Advisory

Timeline

Published: Mar 15, 2021
Last Modified: Jun 17, 2026
Status: Modified

Frequently Asked Questions

What is CVE-2020-25241?

How severe is CVE-2020-25241?

CVE-2020-25241 has a CVSS score of 7.5/10 (HIGH severity). The EPSS model estimates a 1.03% probability of exploitation in the next 30 days.

How do I fix CVE-2020-25241?

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-2020-25241?

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

Scan your code now

Source: NVD / NIST