dbcve.org
Wincc FlexibleApplication · Siemens

CVE-2011-4512

MEDIUM · 5.0 CVSS v2.0 Published 2012-02-03
Mitigation only
No fix yet — a mitigation exists. There is no fixed release. A documented workaround reduces exposure in the meantime.
See remediation →
59/100
Remediation priority · Elevated
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
CRLF injection vulnerability in the HMI web server in Siemens WinCC flexible 2004, 2005, 2007, and 2008 before SP3; WinCC V11 (aka TIA portal) before SP2 Update 1; the TP, OP, MP, Comfort Panels, and Mobile Panels SIMATIC HMI panels; WinCC V11 Runtime Advanced; and WinCC flexible Runtime allows remote attackers to inject arbitrary HTTP headers and conduct HTTP response splitting attacks via unspecified vectors.

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

CRLF injection vulnerability in the HMI web server of Siemens WinCC flexible and SIMATIC HMI panels allows remote attackers to inject arbitrary HTTP headers (CR/LF characters) and conduct HTTP response splitting attacks via unspecified vectors.

MitigationApply vendor patches: update WinCC flexible 2004/2005/2007/2008 to SP3 or later, and WinCC V11 to SP2 Update 1 or later. If patching is not immediately possible, consider restricting network access to the HMI web server or disabling it if not required.

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
Wincc FlexibleApplication
Affected:= 2004= 2005= 2007= 2008
WinccApplication
Affected:<= v11= v11
Simatic Hmi PanelsApplication
Affected:= comfort_panels= mobile_panels= mp= op= tp
Wincc Runtime AdvancedApplication
Affected:= v11
Wincc Flexible RuntimeApplication
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
Authentication
None
Confidentiality
None
Integrity
Partial
Availability
None

AV:N/AC:L/Au:N/C:N/I:P/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. Confirm the HMI web server is enabled
    On the Windows system hosting WinCC flexible or SIMATIC HMI software, check if the HMI web server service or process is running. Look for web server processes in Task Manager or check for open ports typically used by HMI web servers (such as HTTP port 80 or 8080).
    Affected if The HMI web server is actively running and accepting HTTP connections
  2. Identify the installed Siemens software product
    Open Windows Control Panel, Programs and Features, and look for installed Siemens software including WinCC Flexible (versions 2004, 2005, 2007, 2008), WinCC (versions up to and including v11), SIMATIC HMI panels software, WinCC Runtime Advanced v11, or WinCC Flexible Runtime.
    Affected if Any of these Siemens HMI software products are installed
  3. Determine the exact version number
    In the Windows Programs and Features list or within the software itself (usually via Help > About or similar), identify the precise version (such as WinCC Flexible 2008, WinCC v11, or specific HMI panel type).
    Affected if The installed version matches 2004, 2005, 2007, 2008 for WinCC Flexible; any version up to and including v11 for WinCC; or is any version of WinCC Flexible Runtime, WinCC Runtime Advanced v11, or SIMATIC HMI panels (comfort_panels, mobile_panels, mp, op, tp)
  4. Verify the service pack or update level
    Within the software (typically via Help > About or in Programs and Features), check if WinCC Flexible 2004/2005/2007/2008 has Service Pack 3 applied, or if WinCC V11 has Service Pack 2 Update 1 applied.
    Affected if WinCC Flexible 2004/2005/2007/2008 is at SP3 or earlier, or WinCC V11 is at SP2 Update 1 or earlier (for versions that support these updates)

You are affected if the HMI web server is enabled and you are running any version of WinCC Flexible 2004/2005/2007/2008 before SP3, WinCC v11 or earlier before SP2 Update 1, WinCC Runtime Advanced v11, WinCC Flexible Runtime, or any SIMATIC HMI panel software without the vendor patch 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.

From vendor data
Mitigation available No clean upgrade yet — mitigate in the meantime
Mitigation

Apply vendor patches: update WinCC flexible 2004/2005/2007/2008 to SP3 or later, and WinCC V11 to SP2 Update 1 or later. If patching is not immediately possible, consider restricting network access to the HMI web server or disabling it if not required.

Fix this in Wincc Flexible Scoped from the published advisory
  • Consultation4.0 h
  • Implementation8.0 h
  • Testing6.0 h
  • Review / QA2.0 h
20.0 hours of engineering $3,500
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Scan for this in your stack

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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-2011-4512 in production — separate from our analysis above.

No notes yet

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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
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