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Sinumerik 808d V4.7 FirmwareOperating system · Siemens

CVE-2018-11466

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). Specially crafted network packets sent to port 102/tcp (ISO-TSAP) could allow a remote attacker to either cause a Denial-of-Service condition of the integrated software firewall or allow to execute code in the context of the software firewall. The security vulnerability could be exploited by an attacker with network access to the affected systems on port 102/tcp. Successful exploitation requires no user 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

A remote code execution and denial-of-service vulnerability exists in the software firewall of multiple SINUMERIK CNC systems. Specially crafted network packets sent to port 102/tcp (ISO-TSAP) can allow an attacker to execute arbitrary code in the context of the software firewall or crash the firewall, potentially compromising confidentiality, integrity, and availability of the affected CNC systems.

MitigationApply the vendor-supplied patches/updates: Update SINUMERIK 828D V4.7 to V4.7 SP6 HF1 or later, SINUMERIK 840D sl V4.7 to V4.7 SP6 HF5 or later, and SINUMERIK 840D sl V4.8 to V4.8 SP3 or later. For 808D V4.7 and V4.8, contact Siemens for available updates. Additionally, restrict network access to port 102/tcp and implement network segmentation to isolate industrial control systems.

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

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 system HMI or use SNMP/network enumeration to determine if the device is a Sinumerik 808d, 828d, or 840d Sl model. Check system information screen or consult device documentation.
    Affected if The model is one of: Sinumerik 808d, 828d, or 840d Sl.
  2. Determine the firmware version
    On the CNC HMI, navigate to System > Diagnostics or System Information to view the installed firmware version. Alternatively, query the device via SNMP or remote management interface if available.
    Affected if The firmware version is: 808d V4.7 (any), 808d V4.8 (any), 840d Sl V4.7 (any version up to and including 4.7), 840d Sl V4.8 (any version up to and including 4.8), or 828d V4.7 (any version up to and including 4.7).
  3. Verify port 102/tcp accessibility
    Perform a network port scan targeting the CNC device on port 102/tcp using tools such as nmap (nmap -p 102 <target_ip>) or netcat. Check if the port responds or accepts connections from your scanning location.
    Affected if Port 102/tcp is open and reachable from any network segment accessible to untrusted users.
  4. Confirm software firewall status
    On the CNC system, navigate to Settings > Security or Firewall configuration (path varies by version). Check whether the software firewall is enabled or disabled. Consult system administration manual for exact menu path.
    Affected if The software firewall is enabled (the vulnerability exists within the firewall itself when processing packets on port 102).

A user is affected if they have a Sinumerik 808d, 828d, or 840d Sl system running an affected firmware version with port 102/tcp accessible on the network.

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 the vendor-supplied patches/updates: Update SINUMERIK 828D V4.7 to V4.7 SP6 HF1 or later, SINUMERIK 840D sl V4.7 to V4.7 SP6 HF5 or later, and SINUMERIK 840D sl V4.8 to V4.8 SP3 or later. For 808D V4.7 and V4.8, contact Siemens for available updates. Additionally, restrict network access to port 102/tcp and implement network segmentation to isolate industrial control systems.

Recommended fix Moderate confidence

Sinumerik 828D V4.7: V4.7 SP6 HF1 or later; Sinumerik 840D sl V4.7: V4.7 SP6 HF5 or later; Sinumerik 840D sl V4.8: V4.8 SP3 or later; Sinumerik 808D V4.7/V4.8: Contact vendor for specific fixed version

  1. 1. Identify the exact firmware version installed on the affected Sinumerik device using the HMI interface or SINUMERIK service display
  2. 2. For Sinumerik 828D V4.7: Upgrade to V4.7 SP6 HF1 or later
  3. 3. For Sinumerik 840D sl V4.7: Upgrade to V4.7 SP6 HF5 or later
  4. 4. For Sinumerik 840D sl V4.8: Upgrade to V4.8 SP3 or later
  5. 5. For Sinumerik 808D V4.7 and V4.8: Contact Siemens technical support to confirm available patch options since the advisory indicates all versions are affected
  6. 6. After upgrade, verify the software firewall is functioning correctly on port 102/tcp
  7. 7. Restrict network access to port 102/tcp using network segmentation as an additional mitigation layer
Caveat Firmware upgrades on CNC systems require thorough testing in a non-production environment; service pack/hotfix installations may require backup of CNC data and parameters

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
  • Consultation12.0 h
  • Implementation20.0 h
  • Testing16.0 h
  • Review / QA8.0 h
56.0 hours of engineering $9,840
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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

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Peer-ranked notes from engineers who’ve handled CVE-2018-11466 in production — separate from our analysis above.

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