# CVE-2019-13945: Security feature bypass in SIMATIC S7-1200 CPU family (incl. SIPLUS variants) > An attacker can exploit a manufacturing access mode to enable additional diagnostic functionality, bypassing security controls on Siemens SIMATIC PLCs. - **Severity:** Medium 6.8 (`CVSS:3.1/AV:P/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H`) - **Exploited in the wild:** Not known - **Login needed:** Not needed - **Attackable:** Local or same network only - **Victim action needed:** Not needed - **Fix available:** No - **Published:** 12 Dec 2019 - **Updated:** 5 Aug 2024 - **Also known as:** GHSA-6rqc-949w-3mj8 ## What is CVE-2019-13945? CVE-2019-13945 is a medium-severity vulnerability in Siemens AG SIMATIC S7-1200 CPU family (incl. SIPLUS variants), published on 12 Dec 2019. It can only be exploited from the same machine or local network, with no action from the victim. ### Official description A vulnerability has been identified in SIMATIC S7-1200 CPU family (incl. SIPLUS variants) (All versions), SIMATIC S7-1200 CPU family < V4.x (incl. SIPLUS variants) (All versions), SIMATIC S7-1200 CPU family V4.x (incl. SIPLUS variants) (All versions with Function State (FS) < 11), SIMATIC S7-200 SMART CPU CR20s (6ES7 288-1CR20-0AA1) (All versions <= V2.3.0 and Function State (FS) <= 3), SIMATIC S7-200 SMART CPU CR30s (6ES7 288-1CR30-0AA1) (All versions <= V2.3.0 and Function State (FS) <= 3), SIMATIC S7-200 SMART CPU CR40 (6ES7 288-1CR40-0AA0) (All versions <= V2.2.2 and Function State (FS) <= 8), SIMATIC S7-200 SMART CPU CR40s (6ES7 288-1CR40-0AA1) (All versions <= V2.3.0 and Function State (FS) <= 3), SIMATIC S7-200 SMART CPU CR60 (6ES7 288-1CR60-0AA0) (All versions <= V2.2.2 and Function State (FS) <= 10), SIMATIC S7-200 SMART CPU CR60s (6ES7 288-1CR60-0AA1) (All versions <= V2.3.0 and Function State (FS) <= 3), SIMATIC S7-200 SMART CPU SR20 (6ES7 288-1SR20-0AA0) (All versions <= V2.5.0 and Function State (FS) <= 11), SIMATIC S7-200 SMART CPU SR30 (6ES7 288-1SR30-0AA0) (All versions <= V2.5.0 and Function State (FS) <= 10), SIMATIC S7-200 SMART CPU SR40 (6ES7 288-1SR40-0AA0) (All versions <= V2.5.0 and Function State (FS) <= 10), SIMATIC S7-200 SMART CPU SR60 (6ES7 288-1SR60-0AA0) (All versions <= V2.5.0 and Function State (FS) <= 12), SIMATIC S7-200 SMART CPU ST20 (6ES7 288-1ST20-0AA0) (All versions <= V2.5.0 and Function State (FS) <= 9), SIMATIC S7-200 SMART CPU ST30 (6ES7 288-1ST30-0AA0) (All versions <= V2.5.0 and Function State (FS) <= 9), SIMATIC S7-200 SMART CPU ST40 (6ES7 288-1ST40-0AA0) (All versions <= V2.5.0 and Function State (FS) <= 8), SIMATIC S7-200 SMART CPU ST60 (6ES7 288-1ST60-0AA0) (All versions <= V2.5.0 and Function State (FS) <= 8), SIMATIC S7-200 SMART CPU family (All versions). There is an access mode used during manufacturing of the affected devices that allows additional diagnostic functionality. The security vulnerability could be exploited by an attacker with physical access to the UART interface during boot process. Weakness: CWE-749 (Exposed Dangerous Method or Function) ## Which versions are affected by CVE-2019-13945? It affects 16 products. Products: Siemens S7-200 Smart Firmware, Siemens Simatic S7-1200 Firmware, Siemens Simatic S7-200 Smart Cpu Cr20s Firmware, Siemens Simatic S7-200 Smart Cpu Cr30s Firmware, Siemens Simatic S7-200 Smart Cpu Cr40 Firmware, Siemens Simatic S7-200 Smart Cpu Cr40s Firmware, Siemens Simatic S7-200 Smart Cpu Cr60 Firmware, Siemens Simatic S7-200 Smart Cpu Cr60s Firmware, Siemens Simatic S7-200 Smart Cpu Sr20 Firmware, Siemens Simatic S7-200 Smart Cpu Sr30 Firmware, Siemens Simatic S7-200 Smart Cpu Sr40 Firmware, Siemens Simatic S7-200 Smart Cpu Sr60 Firmware, Siemens Simatic S7-200 Smart Cpu St20 Firmware, Siemens Simatic S7-200 Smart Cpu St30 Firmware, Siemens Simatic S7-200 Smart Cpu St40 Firmware, Siemens Simatic S7-200 Smart Cpu St60 Firmware. ## How do I fix CVE-2019-13945? No fix has been published for CVE-2019-13945 yet. Limit exposure of the affected software until one is available. ## Is CVE-2019-13945 being exploited? There is no known exploitation of CVE-2019-13945 in the wild and no public exploit code. ## Fix prompt for AI coding agents ```text Check this codebase for CVE-2019-13945 and fix it if it is affected. What it is: CVE-2019-13945 is a medium-severity vulnerability in Siemens AG SIMATIC S7-1200 CPU family (incl. SIPLUS variants), published on 12 Dec 2019. It can only be exploited from the same machine or local network, with no action from the victim. Exploitation: There is no known exploitation of CVE-2019-13945 in the wild and no public exploit code. Affected product: Siemens AG SIMATIC S7-1200 CPU family (incl. SIPLUS variants). 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-2019-13945/ (Markdown: https://insights.sbomify.com/CVE-2019-13945/index.md) ``` ## Sources - CVE record: https://www.cve.org/CVERecord?id=CVE-2019-13945 - NVD: https://nvd.nist.gov/vuln/detail/CVE-2019-13945 - OSV: https://osv.dev/vulnerability/CVE-2019-13945 --- From sbomify Insights: https://insights.sbomify.com/CVE-2019-13945/ Summaries are generated and may contain mistakes; the official description above is the record.