CVE-2020-25241

mediumpriority · track · 30EPSS 0.011 · 65 %ileEUUS

grimoire priorityP3 · Track

Exploitable?

—

no known exploitation

Likely / severe?

1.07% (65th) EPSS

CVSS 5 · medium

Is it mine?

10 products

Check your exposure

Who says so?

4 sources

cnnvd · enisa_euvd · cisa_csaf_ot · nvd

EPSS · scored 2026-10-27

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.

remediations

Vendor fix, mitigation, or workaround guidance, as published by each source.

A vendor fix is available.

FixedSIMATIC MV400 familycisa_csaf_ot
Update to V7.0.6

cvss

Technical severity, 0–10. One row per scoring source.

7.5

010

base score 0–10 · higher = more severe · hover a vector to decode⚠ sources disagree · medium–high · 5–7.5

v2.05mediumAV:N/AC:L/Au:N/C:N/I:N/A:Pprimary · NVD / NIST USexploitability 10 · impact 2.9

v3.17.5highCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:Hprimary · NVD / NIST USexploitability 3.9 · impact 3.6

v3.17.5highCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H/E:P/RL:U/RC:Csecondary · CISA US

v3.16.9mediumCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H/E:Usecondary · CVSS-BT (t0sche)

weaknesses

The CWE weakness classes this flaw belongs to.

CWE-129USprimaryCWE-1285USCWE-1285US

affected products (10)

Products and version ranges known to be affected.

Siemens SIMATIC MV400 family: All Versions < V7.0.6all versionscisa_csaf_otUS
Siemens SIMATIC MV400 family< V7.0.6cisa_csaf_otUS
Siemens SIMATIC MV400 familyAll Versions → V7.0.6enisa_euvdEU
siemens simatic mv420 sr-b body firmware< 7.0.6nvdUScpe:2.3:o:siemens:simatic_mv420_sr-b_body_firmware:*:*:*:*:*:*:*:*
siemens simatic mv420 sr-b firmware< 7.0.6nvdUScpe:2.3:o:siemens:simatic_mv420_sr-b_firmware:*:*:*:*:*:*:*:*
siemens simatic mv420 sr-p body firmware< 7.0.6nvdUScpe:2.3:o:siemens:simatic_mv420_sr-p_body_firmware:*:*:*:*:*:*:*:*
siemens simatic mv420 sr-p firmware< 7.0.6nvdUScpe:2.3:o:siemens:simatic_mv420_sr-p_firmware:*:*:*:*:*:*:*:*
siemens simatic mv440 hr firmware< 7.0.6nvdUScpe:2.3:o:siemens:simatic_mv440_hr_firmware:*:*:*:*:*:*:*:*
siemens simatic mv440 sr firmware< 7.0.6nvdUScpe:2.3:o:siemens:simatic_mv440_sr_firmware:*:*:*:*:*:*:*:*
siemens simatic mv440 ur firmware< 7.0.6nvdUScpe:2.3:o:siemens:simatic_mv440_ur_firmware:*:*:*:*:*:*:*:*

advisories (1)

Vendor and ecosystem advisories describing this.

ICSA-21-068-07Siemens TCP Stack of SIMATIC MV4002021-03-09icsa · cisa_csaf_otUS
As a general security measure, Siemens strongly recommends to protect network access to devices with appropriate mechanisms. In order to operate the devices in a protected IT environment, Siemens recommends to configure the environment according to Siemens' operational guidelines for Industrial Security (Download: https://www.siemens.com/cert/operational-guidelines-industrial-security), and to follow the recommendations in the product manuals.

also known as (3)

Other names and identifiers for this entity.

sources

Which sources assert this record, and when.

cnnvd enisa_euvd cisa_csaf_ot nvd NVD CVE.org MITRE

published 2021-03-15modified 2026-06-17

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references (7)

External citations — patches, advisories, analysis.

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