dbcve.org
Sinumerik 828d V4.7 FirmwareOperating system · Siemens

CVE-2018-11457

HIGH · 8.1 CVSS v3.0 Published 2018-12-12
Fix available
A fix is available. Upgrade to after 4.8 or later.
See remediation →
90/100
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 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). The integrated web server on port 4842/tcp of the affected products could allow a remote attacker to execute code with privileged permissions on the system by sending specially crafted network requests to port 4842/tcp. Please note that this vulnerability is only exploitable if port 4842/tcp is manually opened in the firewall configuration of network port X130. The security vulnerability could be exploited by an attacker with network access to the affected devices on port 4842/tcp. Successful exploitation requires no privileges and no user interaction. The vulnerability could allow an attacker to compromise confidentiality, integrity and availability of the web server. 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 vulnerability exists in the integrated web server (port 4842/tcp) of Siemens SINUMERIK 828D and 840D sl CNC systems. Attackers with network access to the affected port can send specially crafted requests to execute code with privileged (system) permissions, requiring no authentication or user interaction.

MitigationApply Siemens vendor patches to upgrade to V4.7 SP6 HF1 (828D), V4.7 SP6 HF5 (840D sl V4.7), or V4.8 SP3 (840D sl V4.8). Additionally, ensure port 4842/tcp remains blocked in the firewall and is not exposed to untrusted networks.

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 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
High
Privileges
None
User interaction
None
Scope
Unchanged
Confidentiality
High
Integrity
High
Availability
High

CVSS:3.0/AV:N/AC:H/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 model
    Access the CNC system HMI or check system documentation to confirm whether the device is a Sinumerik 828D or 840D sl
    Affected if The model is 828D or 840D sl
  2. Check the firmware version
    On the CNC HMI, navigate to System > Version or use the 'SELECT_SOFTNUM' system command to display the installed firmware version and service pack
    Affected if The firmware version is 828D V4.7 (any build), 840D sl V4.7 (any build), or 840D sl V4.8 (any build)
  3. Confirm port 4842/tcp is listening
    From a workstation on the same network, run 'nc -zv <device_ip> 4842' or use PowerShell 'Test-NetConnection -Port 4842 -ComputerName <device_ip>' to check if the integrated web server port is open
    Affected if Port 4842/tcp responds and accepts connections
  4. Verify web server is enabled
    On the CNC HMI, go to System > Communications > HTTP Server or check the 'httpd' service status via the service menu to confirm the integrated web server is active
    Affected if The web server service is running and enabled

The environment is affected if the device is a Sinumerik 828D or 840D sl running firmware V4.7 or V4.8, and port 4842/tcp is accessible on the network with the web server enabled.

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.

From vendor data
Upgrade available Upgrade to a release after 4.8
Interim mitigation

Apply Siemens vendor patches to upgrade to V4.7 SP6 HF1 (828D), V4.7 SP6 HF5 (840D sl V4.7), or V4.8 SP3 (840D sl V4.8). Additionally, ensure port 4842/tcp remains blocked in the firewall and is not exposed to untrusted networks.

Fix this in Sinumerik 828d V4.7 Firmware Scoped from the published advisory
  • Consultation4.0 h
  • Implementation8.0 h
  • Testing8.0 h
  • Review / QA4.0 h
24.0 hours of engineering $4,160
Get the upgrade done

An estimate, not a bill — we confirm scope with you before any work starts. Need it this week? Rush from $6,656.

Scan for this in your stack

Free · runs locally
dbcve dependency scanner

Check whether your project pulls in CVE-2018-11457 — or any other known-vulnerable package — straight from your lock files. Free and open source; it runs locally and uploads nothing.

Get it on GitHub Scan in the browser

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-2018-11457 in production — separate from our analysis above.

No notes yet

Be the first to add a field note for this CVE — a mitigation you’ve verified, a version caveat, or a link to a working fix. Sign in above to contribute.

What this is

A place for practitioners to share what actually worked: a mitigation you’ve tested, a configuration change, a version- or environment-specific caveat, or a link to a verified patch. The most useful notes rise to the top as peers upvote them, so the signal stays high.

What belongs here
  • 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
  • No spam, self-promotion, credentials, or personal data