CVE-2020-25241

7.5 HIGH 1% exploit odds Fix listed

What it is

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.

At a glance

Exploitability: Can be exploited over the network without logging in. High risk of service disruption.
Exploit odds: 1.1% chance of exploitation in the next 30 days (EPSS).
Fix: A patch, advisory or fixed version is referenced. Upgrade or apply it.

Timeline

2021-03-15 17:15 UTC PublishedDisclosed publicly on CVE.org and NVD
2026-06-17 03:06 UTC Last updatedMost recent change to the record

Why it ranks here

Exploited in the wild: no, CISA does not list it.
Exploit odds: 1.1% in the next 30 days (EPSS).
Severity: 7.5 HIGH (CVSS).
Fix: a patch or advisory is linked.

Details

Published: 2021-03-15 17:15 UTC
Last modified: 2026-06-17 03:06 UTC
Exploit probability: 1.1% · EPSS, next 30 days
Weakness: CWE-1285
Record status: Modified

Affected

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

Attack profile CVSS 3.1 · 7.5

Attack vector: Network
Complexity: Low
Privileges needed: None
User interaction: None
Scope: Unchanged
Confidentiality: None
Integrity: None
Availability: High

Raw vector

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

Is it in your code?

Hand this to your coding agent. It searches your project for the affected products and checks versions. Nothing leaves your machine.

Read https://cve-list.com/agent/cve/CVE-2020-25241.md and follow it. Check whether this project is affected by CVE-2020-25241. Read only. Don't change anything and don't upload my code. Tell me yes, no or not sure, with the file as proof.

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Fix and advisories

References

NVD record · CVE.org record