CVE-2020-25229

Severity: high (CVSS 7.5 v3.1)
Exploited in the wild: not listed in CISA KEV
EPSS: 0.6% probability of exploitation in the next 30 days
Public exploit or detection template: none known
Published: 2020-12-14 · updated 2026-06-17
Weakness: CWE-321

Description

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.

Affected products

Siemens LOGO! 8 BM (incl. SIPLUS variants): before 8.3 — fixed in 8.3

How to fix

Upgrade to a fixed version: Siemens LOGO! 8 BM (incl. SIPLUS variants) 8.3. Check the vendor advisory for mitigations.

References

https://cert-portal.siemens.com/productcert/pdf/ssa-480824.pdf
https://cert-portal.siemens.com/productcert/pdf/ssa-480824.pdf

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