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Sinumerik 808d V4.7 FirmwareOperating system · Siemens

CVE-2018-11462

CRITICAL · 9.8 CVSS v3.0 Published 2018-12-12
Fix available
A fix is available. Upgrade to after 4.8 or later.
See remediation →
100/100
Remediation priority · Urgent
Remotely reachable No privileges Zero-click

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 · unedited
A vulnerability has been identified in SINUMERIK 808D V4.7 (All versions), SINUMERIK 808D V4.8 (All versions), SINUMERIK 828D V4.7 (All versions < V4.7 SP6 HF1), SINUMERIK 840D sl V4.7 (All versions < V4.7 SP6 HF5), SINUMERIK 840D sl V4.8 (All versions < V4.8 SP3). By sending a specially crafted authentication request to the affected systems a remote attacker could escalate his privileges to an elevated user account but not to root. The security vulnerability could be exploited by an attacker with network access to the affected systems. Successful exploitation requires no privileges and no user interaction. The vulnerability could allow an attacker to compromise confidentiality, integrity and availability of the system. At the time of advisory publication no public exploitation of this security vulnerability was known.

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 confidence

Authentication vulnerability in multiple SINUMERIK CNC systems allows remote attackers to escalate privileges to an elevated user account (non-root) by sending specially crafted authentication requests. The flaw is exploitable over the network with no privileges or user interaction required, potentially compromising system confidentiality, integrity, and availability.

MitigationApply vendor-supplied patches: update SINUMERIK 828D to V4.7 SP6 HF1 or later, 840D sl V4.7 to V4.7 SP6 HF5 or later, and 840D sl V4.8 to V4.8 SP3 or later. Network segmentation and restricting network access to CNC systems should be implemented as compensating controls until patching is possible.

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
Sinumerik 808d V4.7 FirmwareOperating system
Affected:all versions
Sinumerik 808d V4.8 FirmwareOperating system
Affected:all versions
Sinumerik 828d V4.7 FirmwareOperating system
Affected:<= 4.7
Sinumerik 840d Sl V4.7 FirmwareOperating system
Affected:<= 4.7
Sinumerik 840d Sl V4.8 FirmwareOperating system
Affected:<= 4.8

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:3.0/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 checks

Work through these to decide whether this CVE applies to you.

  1. Identify the SINUMERIK CNC model
    Access the CNC HMI and locate the system identification. On Sinumerik 808d, 828d, or 840d sl, the model is typically displayed on the startup screen, under 'System > System Information', or on a system data plate on the control unit.
    Affected if The model is a Sinumerik 808d, 828d, or 840d sl
  2. Determine the firmware version
    On the HMI, navigate to 'System > Version Information' or 'System > Overview' to display the installed firmware version. The version number (such as V4.7, V4.8) is shown in the firmware or software version display.
    Affected if The firmware version cannot be determined or is not visible
  3. Check if version is in affected range for 808d
    For Sinumerik 808d, if identified, check whether the firmware version is V4.7 or V4.8 (all versions of these releases are affected per the advisory).
    Affected if The installed version is Sinumerik 808d with V4.7 or V4.8 firmware
  4. Check if version is in affected range for 828d
    For Sinumerik 828d, verify if the firmware version is V4.7 or earlier. Versions V4.7 and below are affected; V4.7 SP6 HF1 or later would be patched.
    Affected if The installed version is Sinumerik 828d with firmware <= V4.7
  5. Check if version is in affected range for 840d sl
    For Sinumerik 840d sl, verify if the firmware is V4.7 (any version <= V4.7) or V4.8 (any version <= V4.8). Versions V4.7 SP6 HF5 or later and V4.8 SP3 or later contain patches.
    Affected if The installed version is Sinumerik 840d sl with firmware <= V4.7 or <= V4.8

A system is affected if it is a Sinumerik 808d (V4.7 or V4.8), 828d (V4.7 or earlier), or 840d sl (V4.7 or earlier, or V4.8 or earlier) and no vendor patch has been applied.

Generated from the published advisory. Verify against your own configuration.

Check your environment

Paste your version and any relevant configuration and it will be compared against the affected criteria above. Do not include secrets or credentials.

AI-assisted, checked against the advisory. Informational, not a guarantee.

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.

dbcve · scoped
Upgrade available Upgrade to a release after 4.8
Interim mitigation

Apply vendor-supplied patches: update SINUMERIK 828D to V4.7 SP6 HF1 or later, 840D sl V4.7 to V4.7 SP6 HF5 or later, and 840D sl V4.8 to V4.8 SP3 or later. Network segmentation and restricting network access to CNC systems should be implemented as compensating controls until patching is possible.

Recommended fix Moderate confidence

V4.7 SP6 HF1 or later (828D), V4.7 SP6 HF5 or later (840D sl V4.7), V4.8 SP3 or later (840D sl V4.8), contact vendor for 808D patches

  1. Contact Siemens through their official support channels (cert-portal.siemens.com or Siemens technical support) to obtain the specific firmware updates
  2. For Sinumerik 828D V4.7: Upgrade to version V4.7 SP6 HF1 or later
  3. For Sinumerik 840D sl V4.7: Upgrade to version V4.7 SP6 HF5 or later
  4. For Sinumerik 840D sl V4.8: Upgrade to version V4.8 SP3 or later
  5. For Sinumerik 808D V4.7 and V4.8: Contact Siemens for available patches as all versions are affected
  6. Follow Siemens' official firmware update procedure for your specific Sinumerik model
  7. Verify the upgrade was successful and the vulnerability is resolved
  8. Implement network segmentation and access controls to reduce attack surface as a compensating control
Caveat Review Siemens release notes for any compatibility considerations before upgrading industrial control system firmware

Generated from the published advisory — verify against the referenced sources before acting.

Fix this in Sinumerik 808d V4.7 Firmware Scoped from the published advisory
  • Consultation8.0 h
  • Implementation16.0 h
  • Testing12.0 h
  • Review / QA8.0 h
44.0 hours of engineering $7,720
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References Go to the primary sourcePrimary sources — vendor advisories, patches and trackers. Where our summary and a reference disagree, the reference wins.

Primary sources

Practitioner notes

Contributed

Peer-ranked notes from engineers who’ve handled CVE-2018-11462 in production — separate from our analysis above.

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What this is

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  • Version or environment caveats, and links to real fixes
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