# CVE-2019-6575: Denial of service in SIMATIC CP 443-1 OPC UA > Unauthenticated remote attackers can cause denial of service or crash Siemens SIMATIC devices via crafted network packets on port 4840. - **Severity:** High 7.5 (`CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H`) - **Exploited in the wild:** Not known - **Login needed:** Not needed - **Attackable:** Over the internet - **Victim action needed:** Not needed - **Fix available:** No - **Published:** 17 Apr 2019 - **Updated:** 3 Jun 2026 - **Also known as:** GHSA-q8p5-c986-46jg ## What is CVE-2019-6575? CVE-2019-6575 is a high-severity denial of service vulnerability in Siemens Telecontrol Server Basic, published on 17 Apr 2019. An attacker can exploit it over the internet without logging in, with no action from the victim. ### Official description A vulnerability has been identified in SIMATIC CP 443-1 OPC UA (All versions), SIMATIC ET 200SP Open Controller CPU 1515SP PC2 (incl. SIPLUS variants) (All versions < V2.7), SIMATIC HMI Comfort Outdoor Panels 7" & 15" (incl. SIPLUS variants) (All versions < V15.1 Upd 4), SIMATIC HMI Comfort Panels 4" - 22" (incl. SIPLUS variants) (All versions < V15.1 Upd 4), SIMATIC HMI KTP Mobile Panels KTP400F, KTP700, KTP700F, KTP900 and KTP900F (All versions < V15.1 Upd 4), SIMATIC IPC DiagMonitor (All versions < V5.1.3), SIMATIC NET PC Software V13 (All versions), SIMATIC NET PC Software V14 (All versions < V14 SP1 Update 14), SIMATIC NET PC Software V15 (All versions), SIMATIC RF188C (All versions < V1.1.0), SIMATIC RF600R family (All versions < V3.2.1), SIMATIC S7-1500 CPU family (incl. related ET200 CPUs and SIPLUS variants) (All versions >= V2.5 < V2.6.1), SIMATIC S7-1500 Software Controller (All versions between V2.5 (including) and V2.7 (excluding)), SIMATIC WinCC OA (All versions < V3.15 P018), SIMATIC WinCC Runtime Advanced (All versions < V15.1 Upd 4), SINEC NMS (All versions < V1.0 SP1), SINEMA Server (All versions < V14 SP2), SINUMERIK OPC UA Server (All versions < V2.1), TeleControl Server Basic (All versions < V3.1.1). Specially crafted network packets sent to affected devices on port 4840/tcp could allow an unauthenticated remote attacker to cause a denial of service condition of the OPC communication or crash the device. The security vulnerability could be exploited by an attacker with network access to the affected systems. Successful exploitation requires no system privileges and no user interaction. An attacker could use the vulnerability to compromise availability of the OPC communication. Weakness: CWE-755 (Improper Handling of Exceptional Conditions), CWE-248 (Uncaught Exception) ## Which versions are affected by CVE-2019-6575? It affects 27 products. Products: Siemens Opc Unified Architecture, Siemens Simatic Cp443-1 Opc Ua Firmware, Siemens Simatic Et 200 Open Controller Cpu 1515sp Pc2 Firmware, Siemens Simatic Hmi Comfort Outdoor Panels Firmware, Siemens Simatic Hmi Ktp Mobile Panels Ktp400f Firmware, Siemens Simatic Hmi Ktp Mobile Panels Ktp700 Firmware, Siemens Simatic Hmi Ktp Mobile Panels Ktp700f Firmware, Siemens Simatic Hmi Ktp Mobile Panels Ktp900 Firmware, Siemens Simatic Hmi Ktp Mobile Panels Ktp900f Firmware, Siemens Simatic Ipc Diagmonitor Firmware, Siemens Simatic Net Pc Software Firmware, Siemens Simatic Rf188c Firmware, Siemens Simatic Rf600r Firmware, Siemens Simatic S7-1500 Firmware, Siemens Simatic S7-1500 Software Controller, Siemens Simatic S7-1500f Firmware, Siemens Simatic S7-1500s Firmware, Siemens Simatic S7-1500t Firmware, Siemens Simatic Wincc Oa, Siemens Simatic Wincc Runtime Advanced and 7 more. ## How do I fix CVE-2019-6575? No fix has been published for CVE-2019-6575 yet. Limit exposure of the affected software until one is available. ## Is CVE-2019-6575 being exploited? There is no known exploitation of CVE-2019-6575 in the wild and no public exploit code. ## Fix prompt for AI coding agents ```text Check this codebase for CVE-2019-6575 and fix it if it is affected. What it is: CVE-2019-6575 is a high-severity denial of service vulnerability in Siemens Telecontrol Server Basic, published on 17 Apr 2019. An attacker can exploit it over the internet without logging in, with no action from the victim. Exploitation: There is no known exploitation of CVE-2019-6575 in the wild and no public exploit code. Affected product: Siemens Telecontrol Server Basic. No package-level version data is available, so check the vendor advisory linked from the reference page. Task: 1. Search the dependency manifests and lockfiles (for example package.json, package-lock.json, requirements.txt, poetry.lock, uv.lock, pom.xml, build.gradle, go.mod, Cargo.lock, Gemfile.lock) and any Dockerfiles for the affected packages, including transitive dependencies. 2. If an affected version is in use, upgrade it to the fixed version for its release line with the project's package manager, so the lockfile is regenerated. Prefer the smallest upgrade that fixes it. 3. If there is no fix, or the upgrade would break the build, do not guess: explain the risk and the safest workaround instead. 4. Run the tests and summarise what changed and why. 5. If nothing in the project is affected, say so and change nothing. Reference: https://insights.sbomify.com/CVE-2019-6575/ (Markdown: https://insights.sbomify.com/CVE-2019-6575/index.md) ``` ## Sources - CVE record: https://www.cve.org/CVERecord?id=CVE-2019-6575 - NVD: https://nvd.nist.gov/vuln/detail/CVE-2019-6575 - OSV: https://osv.dev/vulnerability/CVE-2019-6575 --- From sbomify Insights: https://insights.sbomify.com/CVE-2019-6575/ Summaries are generated and may contain mistakes; the official description above is the record.