CVE-2019-6576
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 · uneditedA vulnerability has been identified in SIMATIC HMI Comfort Panels 4" - 22" (All versions < V15.1 Update 1), SIMATIC HMI Comfort Outdoor Panels 7" & 15" (All versions < V15.1 Update 1), SIMATIC HMI KTP Mobile Panels KTP400F, KTP700, KTP700F, KTP900 und KTP900F (All versions < V15.1 Update 1), SIMATIC WinCC Runtime Advanced (All versions < V15.1 Update 1), SIMATIC WinCC Runtime Professional (All versions < V15.1 Update 1), SIMATIC WinCC (TIA Portal) (All versions < V15.1 Update 1), SIMATIC HMI Classic Devices (TP/MP/OP/MP Mobile Panel) (All versions). An attacker with network access to affected devices could potentially obtain a TLS session key. If the attacker is able to observe TLS traffic between a legitimate user and the device, then the attacker could decrypt the TLS traffic. The security vulnerability could be exploited by an attacker who has network access to the web interface of the device and who is able to observe TLS traffic between legitimate users and the web interface of the affected device. The vulnerability could impact the confidentiality of the communication between the affected device and a legitimate user. At the time of advisory publication no public exploitation of the 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 confidenceA vulnerability in Siemens SIMATIC HMI devices allows an attacker with network access to the web interface to obtain TLS session keys, enabling decryption of TLS traffic between legitimate users and the affected device. This compromises the confidentiality of communications. The issue affects the web server component of these industrial HMIs and SCADA visualization platforms.
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< 15.1< 15.1< 15.1< 15.1< 15.1< 15.1< 15.1< 15.1CVSS 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
- Adjacent
- Complexity
- Low
- Privileges
- None
- User interaction
- None
- Scope
- Unchanged
- Confidentiality
- High
- Integrity
- None
- Availability
- None
CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:H/I:N/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 checksWork through these to decide whether this CVE applies to you.
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Identify the SIMATIC HMI device modelLocate the device nameplate or check the device configuration in TIA Portal to determine the exact model (e.g., Simatic Hmi Comfort Panel, Ktp Mobile Panel, or WinCC installation)Affected if The device is one of the listed affected product families (Comfort Panels, Ktp Mobile Panels, or WinCC)
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Check the firmware version on the HMI deviceAccess the device via TIA Portal or the device web interface and retrieve the firmware version from the device information or system diagnosticsAffected if The installed firmware version is below 15.1 (e.g., 14.x or earlier)
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Check the WinCC software version if applicableIn Windows, open TIA Portal or the installed programs list and verify the WinCC (TIA Portal) version numberAffected if The installed WinCC version is below 15.1
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Verify the web server component is enabledIn TIA Portal, open the device settings and check if the web server/HMI web interface is enabled under the Web server runtime settingsAffected if The web server feature is enabled on the device
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Confirm TLS is configured for web communicationsAccess the device web interface over HTTPS or check the SSL/TLS settings in TIA Portal to verify encrypted web communications are in useAffected if TLS/SSL encryption is configured for the web interface (the vulnerability exploits TLS session keys)
You are affected if your device runs firmware or WinCC version below 15.1 AND has the web server component enabled with TLS configured for web interface access.
Generated from the published advisory. Verify against your own configuration.
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 data15.1
Update affected SIMATIC HMI devices and WinCC software to V15.1 Update 1 or later. For SIMATIC HMI Classic Devices (TP/MP/OP/MP Mobile Panel) with no fix available, implement network segmentation and monitor for suspicious TLS traffic patterns.
- Consultation4.0 h
- Implementation8.0 h
- Testing6.0 h
- Review / QA2.0 h
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Free · runs locallyCheck whether your project pulls in CVE-2019-6576 — or any other known-vulnerable package — straight from your lock files. Free and open source; it runs locally and uploads nothing.
References Go to the primary sourcePrimary sources — vendor advisories, patches and trackers. Where our summary and a reference disagree, the reference wins.
Primary sourcesPractitioner notes
ContributedPeer-ranked notes from engineers who’ve handled CVE-2019-6576 in production — separate from our analysis above.
The advisory tells you what broke. It rarely tells you what actually worked. If you’ve dealt with this one, that detail is what the next engineer is searching for.
- The version that genuinely resolved it — not the one the vendor claimed
- A config change or rule that shut the vector down
- A gotcha in the upgrade path that cost you an afternoon
No notes yet
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- Version or environment caveats, and links to real fixes
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