CVE-2020-25234

lowpriority · track · 31OT risk · elevatedEPSS 0.003 · 25 %ileEUUS

grimoire priorityP3 · Track

Exploitable?

—

no known exploitation

Likely / severe?

0.32% (25th) EPSS

CVSS 3.6 · low

Is it mine?

7 products

Check your exposure

Who says so?

4 sources

cnnvd · enisa_euvd · cisa_csaf_ot · nvd

EPSS · scored 2026-10-28

A vulnerability has been identified in LOGO! 8 BM (incl. SIPLUS variants) (All versions < V8.3), LOGO! Soft Comfort (All versions < V8.3). The LOGO! program files generated and used by the affected components offer the possibility to save user-defined functions (UDF) in a password protected way. This protection is implemented in the software that displays the information. An attacker could reverse engineer the UDFs directly from stored program files.

remediations

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

A vendor fix is available.

FixedLOGO! 8 BM (incl.'SIPLUS variants)cisa_csaf_ot
Update to V8.3. Notice that in order to update, a new hardware version if required.
https://support.industry.siemens.com/cs/ww/en/view/109783346/
FixedLOGO! Soft Comfortcisa_csaf_ot
Update to V8.3
https://support.industry.siemens.com/cs/ww/en/view/109783154/
MitigationLOGO! 8 BM (incl.'SIPLUS variants)cisa_csaf_ot
Apply Defense-in-Depth concept, including protection concept outlined in the system manual.
MitigationLOGO! Soft Comfortcisa_csaf_ot
Apply Defense-in-Depth concept, including protection concept outlined in the system manual.

cvss

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

7.7

010

base score 0–10 · higher = more severe · hover a vector to decode⚠ sources disagree · low–high · 3.6–7.7

v2.03.6lowAV:L/AC:L/Au:N/C:P/I:P/A:Nprimary · NVD / NIST USexploitability 3.9 · impact 4.9

v3.17.7highCVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:Nprimary · NVD / NIST USexploitability 2.5 · impact 5.2

v3.17.7highCVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:N/E:P/RL:O/RC:Csecondary · CISA US

v3.17.1highCVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:N/E:Usecondary · CVSS-BT (t0sche)

weaknesses

The CWE weakness classes this flaw belongs to.

CWE-321USCWE-321US

affected products (7)

Products and version ranges known to be affected.

Siemens LOGO! 8 BM (incl.'SIPLUS variants): All versions < V8.3all versionscisa_csaf_otUS
Siemens LOGO! Soft Comfort: All versions < V8.3all versionscisa_csaf_otUS
Siemens LOGO! 8 BM (incl.'SIPLUS variants)< V8.3cisa_csaf_otUS
Siemens LOGO! Soft Comfort< V8.3cisa_csaf_otUS
Siemens LOGO! 8 BM (incl. SIPLUS variants)All versions → V8.3enisa_euvdEU
Siemens LOGO! Soft ComfortAll versions → V8.3enisa_euvdEU
siemens logo! 8 bm firmware< 8.3nvdUScpe:2.3:o:siemens:logo\!_8_bm_firmware:*:*:*:*:*:*:*:*

advisories (1)

Vendor and ecosystem advisories describing this.

ICSA-20-343-10Siemens LOGO! 8 BM2020-12-08icsa · 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 2020-12-14modified 2026-06-17

references (6)

External citations — patches, advisories, analysis.

scry

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