What is CVE-2020-25231?

CVE-2020-25231 is a medium-severity vulnerability in Siemens Logo\! 8 Bm, classified under Use of Hard-coded Cryptographic Key. CVSS score: 5.5/10. Published 2020-12-14.

How severe is CVE-2020-25231?

Medium severity. CVSS v3 base score is 5.5 out of 10.

Vulnerability in Siemens Logo\! 8 Bm

CVE-2020-25231

A vulnerability has been identified in LOGO! 8 BM (incl. SIPLUS variants) (All versions < V8.3), LOGO! Soft Comfort (All versions < V8.3). The encryption of program data for the affected devices uses a static key. An attacker could use this key to extract confidential information from protected program files.

Published 2020-12-14 · last modified 2026-06-17.

CVSS v3 metric

CVSS v3 base score 5.5 (Medium). Vector: CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:N.

EPSS exploit prediction

EPSS: 0.002 (6.7th percentile), scored 2026-09-26.

Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 7th percentile — 6.7% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.

EPSS over last 30 days · oldest: 0.002 · newest: 0.002 · change: +0.000

Affected products

Siemens Logo\! 8 Bm
Siemens Logo\! 8 Bm Firmware
Siemens Logo! 8 Bm (Incl. Siplus Variants) — versions All versions < V8.3
Siemens Logo! Soft Comfort — versions All versions < V8.3
Siemens Logo\! Soft Comfort

Weakness classification (CWE)

References

cert-portal.siemens.com/productcert/pdf/ssa-480824.pdf (Vendor Advisory)

Frequently asked questions

What is CVE-2020-25231?: CVE-2020-25231 is a medium-severity vulnerability in Siemens Logo\! 8 Bm, classified under Use of Hard-coded Cryptographic Key. CVSS score: 5.5/10. Published 2020-12-14.
How severe is CVE-2020-25231?: Medium severity. CVSS v3 base score is 5.5 out of 10.