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Pfc200 FirmwareOperating system · Wago

CVE-2016-9362

CRITICAL · 9.1 CVSS v3.0 Published 2017-02-13
Mitigation only
No fix yet — a mitigation exists. There is no fixed release. A documented workaround reduces exposure in the meantime.
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
An issue was discovered in WAGO 750-8202/PFC200 prior to FW04 (released August 2015), WAGO 750-881 prior to FW09 (released August 2016), and WAGO 0758-0874-0000-0111. By accessing a specific uniform resource locator (URL) on the web server, a malicious user is able to edit and to view settings without authenticating.

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

This is an authentication bypass vulnerability in WAGO PLC web servers (750-8202/PFC200 and 750-881 series and the 0758-0874-0000-0111 model). By accessing a specific URL on the embedded web server, an unauthenticated attacker can view and modify device settings, gaining full control over the industrial controller without any credentials.

MitigationUpgrade firmware to FW04 (750-8202/PFC200) or FW09 (750-881) or later. Until patching is possible, restrict network access to the device's web interface using firewall rules or network segmentation.

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
Pfc200 FirmwareOperating system
Affected:all versions
750 Xxxx Series FirmwareOperating system
Affected:all versions
758 Xxxx Series FirmwareOperating system
Affected:all versions

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
None

CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/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 checks

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

  1. Identify WAGO PLC model
    Check the device label, web interface banner, or system info page for the model number. Look for 750-xxx or 758-xxx series identifiers, specifically models 750-8202/PFC200, 750-881, or 0758-0874-0000-0111.
    Affected if The device is a WAGO 750 series or 758 series PLC (or the specific models listed).
  2. Check firmware version
    Access the device web interface and navigate to the firmware/version information page, or use the device console and run 'fw_printenv' or check '/etc/version' to retrieve the installed firmware version.
    Affected if The firmware version is any version (all versions of the listed products are affected).
  3. Confirm web server is enabled
    Attempt to access the device web server on the standard HTTP port (typically port 80 or 443). Check if the web service responds to requests.
    Affected if The web server is running and responding to HTTP/HTTPS requests.
  4. Test for unauthenticated URL access
    Send an HTTP GET request to the device web server for the specific management or configuration URL known to bypass authentication (typically a path under /menu or /cgi-bin). Check if the response provides access to device settings without any login prompt.
    Affected if The device returns configuration or settings pages without requiring authentication credentials.

If the device is a WAGO 750/758 series PLC with any firmware version and its web server is accessible, the specific unauthenticated URL can be accessed without login, indicating the device is affected.

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
Mitigation available No clean upgrade yet — mitigate in the meantime
Mitigation

Upgrade firmware to FW04 (750-8202/PFC200) or FW09 (750-881) or later. Until patching is possible, restrict network access to the device's web interface using firewall rules or network segmentation.

Recommended fix Moderate confidence

PFC200: FW04 or later; 750-881: FW09 or later; 758 series: Contact WAGO for fixed version

  1. 1. Identify the exact WAGO device model (PFC200, 750-881, or 758 series) from the physical device or management interface
  2. 2. Visit the official WAGO website or contact WAGO support to obtain the fixed firmware version
  3. 3. For PFC200 devices: Upgrade to Firmware FW04 or later (released August 2015 or newer)
  4. 4. For 750-881 devices: Upgrade to Firmware FW09 or later (released August 2016 or newer)
  5. 5. For 758 series devices (0758-0874-0000-0111): Contact WAGO for the specific fixed firmware version
  6. 6. Back up the current device configuration before upgrading
  7. 7. Upload and install the new firmware following WAGO's official upgrade procedure
  8. 8. After upgrade, verify that the specific unauthenticated URL no longer provides access without login
Caveat Firmware upgrades may require downtime and could potentially reset device configurations; always backup before upgrading

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

Fix this in Pfc200 Firmware Scoped from the published advisory
  • Consultation6.0 h
  • Implementation8.0 h
  • Testing4.0 h
  • Review / QA4.0 h
22.0 hours of engineering $3,960
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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-2016-9362 in production — separate from our analysis above.

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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