CVE-2020-25233
Official description Straight from the sourceThe vendor's or NVD's own wording, published unedited. Authoritative, but often terse — it says what broke, rarely what to do.
NVD · uneditedA vulnerability has been identified in LOGO! 8 BM (incl. SIPLUS variants) (All versions < V8.3). The firmware update of affected devices contains the private RSA key that is used as a basis for encryption of communication with the device.
Technical summary Written by usOur analysis, written from the advisory, the CVSS vector and the affected-version data. It adds context the advisory leaves out, and never invents facts that are not in the source.
dbcve analysis · high confidenceThe firmware for LOGO! 8 BM devices (versions prior to V8.3) contains a private RSA key embedded in the binary. This private key, intended for encrypted device communication, is distributed publicly with the firmware download. An attacker who obtains the firmware can extract this key and use it to decrypt communications with the device or impersonate the device, enabling man-in-the-middle attacks.
Verify against the referenced sources before acting — the references below are authoritative for this CVE, this summary is not.
Affected products & versions What the vendor confirmedThe version ranges the vendor confirmed as vulnerable. If your version sits inside a range here, treat yourself as exposed until you have upgraded.
NVD · CPE data< 8.3CVSS breakdown How the score is builtThe industry scoring standard. It rates how the flaw is reached, what it takes to exploit, and what an attacker gains — the score is derived from those, not the other way round.
From the vector- Attack vector
- Local
- Complexity
- Low
- Privileges
- Low
- User interaction
- None
- Scope
- Unchanged
- Confidentiality
- High
- Integrity
- None
- Availability
- None
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:N
Am I affected? How to checkSteps we derive from the advisory and the affected-version data, so you can decide whether this CVE reaches your setup. They are a guide, not a scan — your own configuration is the authority.
dbcve checksWork through these to decide whether this CVE applies to you.
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Identify LOGO! 8 BM devices on the networkLocate all Siemens LOGO! 8 BM devices by reviewing network inventory, asset lists, or using network scanning tools to identify devices with the LOGO! 8 BM product identifierAffected if Any LOGO! 8 BM device is present in the environment
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Access device firmware versionLog into the device web interface, use Siemens TIA Portal, or query the device through its management interface to retrieve the current firmware versionAffected if The displayed firmware version is less than V8.3
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Compare version to affected rangeReview the obtained firmware version number and confirm it falls within the affected range of versions prior to V8.3Affected if Firmware version is earlier than V8.3 (for example, V8.2, V8.1, V8.0, or earlier)
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Verify key rotation statusIf the device was previously on firmware < V8.3 but has been updated, confirm whether the device's RSA key pair has been regenerated after the firmware update to V8.3 or laterAffected if The device still uses the original embedded key from pre-V8.3 firmware
A user is affected if any LOGO! 8 BM device in their environment is running firmware version earlier than V8.3, as this firmware contains the publicly exposed private RSA key.
Generated from the published advisory. Verify against your own configuration.
Remediation Closing itWhat it takes to close this. Where a vendor fix exists we point at it; where none exists we say so plainly, and can build one. Effort estimates are scoped from the advisory, not from your codebase.
From vendor data8.3
Update LOGO! 8 BM devices to firmware version V8.3 or later, which replaces the compromised private key. Additionally, implement network segmentation and monitor for suspicious device communications given the key exposure in older firmware versions.
- Consultation4.0 h
- Implementation3.0 h
- Testing6.0 h
- Review / QA2.0 h
An estimate, not a bill — we confirm scope with you before any work starts. Need it this week? Rush from $4,160.
Scan for this in your stack
Free · runs locallyCheck whether your project pulls in CVE-2020-25233 — or any other known-vulnerable package — straight from your lock files. Free and open source; it runs locally and uploads nothing.
References Go to the primary sourcePrimary sources — vendor advisories, patches and trackers. Where our summary and a reference disagree, the reference wins.
Primary sourcesPractitioner notes
ContributedPeer-ranked notes from engineers who’ve handled CVE-2020-25233 in production — separate from our analysis above.
The advisory tells you what broke. It rarely tells you what actually worked. If you’ve dealt with this one, that detail is what the next engineer is searching for.
- The version that genuinely resolved it — not the one the vendor claimed
- A config change or rule that shut the vector down
- A gotcha in the upgrade path that cost you an afternoon
No notes yet
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- Verified mitigations, workarounds, and config changes
- Version or environment caveats, and links to real fixes
- No weaponised exploit code, or anything meant to cause harm
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