CVE-2024-56336
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 SINAMICS S200 (All versions with serial number beginning with SZVS8, SZVS9, SZVS0 or SZVSN and the FS number is 02). The affected device contains an unlocked bootloader. This security oversight enables attackers to inject malicious code, or install untrusted firmware. The intrinsic security features designed to protect against data manipulation and unauthorized access are compromised when the bootloader is not secured.
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 SINAMICS S200 drive contains an unlocked bootloader in specific serial number ranges (SZVS8, SZVS9, SZVS0, SZVSN with FS number 02). This allows attackers to inject malicious code or install untrusted firmware, bypassing built-in security protections against data manipulation and unauthorized access.
Verify against the referenced sources before acting — the references below are authoritative for this CVE, this summary is not.
CVSS 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
- Network
- Complexity
- Low
- Privileges
- None
- User interaction
- None
- Scope
- Unchanged
- Confidentiality
- High
- Integrity
- High
- Availability
- High
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
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 SINAMICS S200 drive modelLocate the device nameplate or check device documentation/driver software to confirm the model is SINAMICS S200Affected if Device is not a SINAMICS S200 drive (not affected)
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Retrieve device serial numberRead the serial number from the device nameplate, or query the device via its configuration interface or engineering software (e.g., TIA Portal, SINAMICS Startdrive)Affected if Serial number cannot be retrieved or does not exist
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Check serial number prefixExamine the first 5 characters of the serial number for affected prefixes: SZVS8, SZVS9, SZVS0, or SZVSNAffected if Serial number does NOT start with any of these prefixes (not affected)
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Verify FS numberLocate the FS (Field Service) number on the device nameplate or via device parameters - typically appears after the serial number prefix (e.g., in format SZVSx-02xxxx)Affected if FS number is NOT 02 (not affected)
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Confirm bootloader state (if accessible)If device diagnostics or bootloader interface is accessible, verify whether signature validation or secure boot is enabled on the bootloaderAffected if Secure boot or signature validation is disabled/unlocked
Device is affected if it is a SINAMICS S200 with serial number starting with SZVS8, SZVS9, SZVS0, or SZVSN AND FS number 02, indicating an unlocked bootloader that does not enforce firmware signature validation.
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 dataContact Siemens for a security patch or firmware update that secures the bootloader; until then, network-segment the device and monitor for unauthorized access attempts.
- Consultation4.0 h
- Implementation8.0 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 $5,600.
Scan for this in your stack
Free · runs locallyCheck whether your project pulls in CVE-2024-56336 — 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-2024-56336 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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