What is CVE-2020-25229?

CVE-2020-25229 is a high-severity vulnerability in Siemens Logo\! 8 Bm, classified under Use of Hard-coded Cryptographic Key. CVSS score: 7.5/10. Published 2020-12-14.

How severe is CVE-2020-25229?

High severity. CVSS v3 base score is 7.5 out of 10.

Vulnerability in Siemens Logo\! 8 Bm

CVE-2020-25229

A vulnerability has been identified in LOGO! 8 BM (incl. SIPLUS variants) (All versions < V8.3). The implemented encryption for communication with affected devices is prone to replay attacks due to the usage of a static key. An attacker could change the password or change the configuration on any affected device if using prepared messages that were generated for another device.

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

CVSS v3 metric

CVSS v3 base score 7.5 (High). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N.

EPSS exploit prediction

EPSS: 0.006 (48.9th percentile), scored 2026-09-26.

Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 49th percentile — 48.9% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.

EPSS over last 30 days · oldest: 0.006 · newest: 0.006 · 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

Weakness classification (CWE)

References

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

Frequently asked questions

What is CVE-2020-25229?: CVE-2020-25229 is a high-severity vulnerability in Siemens Logo\! 8 Bm, classified under Use of Hard-coded Cryptographic Key. CVSS score: 7.5/10. Published 2020-12-14.
How severe is CVE-2020-25229?: High severity. CVSS v3 base score is 7.5 out of 10.