# CVE-2019-13939: Denial of service in APOGEE MEC/MBC/PXC (P2) > An attacker can cause denial of service by sending crafted DHCP packets to change the device IP address to an invalid value. - **Severity:** High 7.1 (`CVSS:4.0/AV:A/AC:L/AT:N/PR:N/UI:N/VC:N/VI:L/VA:H/SC:N/SI:N/SA:N`) - **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:** 16 Jan 2020 - **Updated:** 10 Jun 2025 - **Also known as:** GHSA-jpvr-c9fc-2r4h ## What is CVE-2019-13939? CVE-2019-13939 is a high-severity denial of service vulnerability in Siemens APOGEE MEC/MBC/PXC (P2), published on 16 Jan 2020. 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 APOGEE MEC/MBC/PXC (P2) (All versions < V2.8.2), APOGEE PXC Compact (BACnet) (All versions < V3.5.3), APOGEE PXC Compact (P2 Ethernet) (All versions >= V2.8.2 < V2.8.19), APOGEE PXC Modular (BACnet) (All versions < V3.5.3), APOGEE PXC Modular (P2 Ethernet) (All versions >= V2.8.2 < V2.8.19), Capital Embedded AR Classic 431-422 (All versions), Capital Embedded AR Classic R20-11 (All versions < V2303), Desigo PXC00-E.D (All versions >= V2.3 < V6.0.327), Desigo PXC00-U (All versions >= V2.3x and < V6.00.327), Desigo PXC001-E.D (All versions >= V2.3 < V6.0.327), Desigo PXC100-E.D (All versions >= V2.3 < V6.0.327), Desigo PXC12-E.D (All versions >= V2.3 < V6.0.327), Desigo PXC128-U (All versions >= V2.3x and < V6.00.327), Desigo PXC200-E.D (All versions >= V2.3 < V6.0.327), Desigo PXC22-E.D (All versions >= V2.3 < V6.0.327), Desigo PXC22.1-E.D (All versions >= V2.3 < V6.0.327), Desigo PXC36.1-E.D (All versions >= V2.3 < V6.0.327), Desigo PXC50-E.D (All versions >= V2.3 < V6.0.327), Desigo PXC64-U (All versions >= V2.3x and < V6.00.327), Desigo PXM20-E (All versions >= V2.3 < V6.0.327), Nucleus NET (All versions), Nucleus ReadyStart V3 (All versions < V2017.02.3), Nucleus Source Code (All versions), SIMOTICS CONNECT 400 (All versions < V0.3.0.330), TALON TC Compact (BACnet) (All versions < V3.5.3), TALON TC Modular (BACnet) (All versions < V3.5.3). By sending specially crafted DHCP packets to a device where the DHCP client is enabled, an attacker could change the IP address of the device to an invalid value. Weakness: CWE-20 (Improper Input Validation) ## Which versions are affected by CVE-2019-13939? It affects 26 products. Products: Siemens Apogee Modular Building Controller Firmware, Siemens Apogee Modular Equiment Controller Firmware, Siemens Apogee Pxc Firmware, Siemens Capital Vstar, Siemens Desigo Pxc00-E.d Firmware, Siemens Desigo Pxc00-U Firmware, Siemens Desigo Pxc001-E.d Firmware, Siemens Desigo Pxc12-E.d Firmware, Siemens Desigo Pxc22-E.d Firmware, Siemens Desigo Pxc22.1-E.d Firmware, Siemens Desigo Pxc36.1-E.d Firmware, Siemens Desigo Pxc Firmware, Siemens Desigo Pxm20 Firmware, Siemens Desigopxc100-E.d Firmware, Siemens Desigopxc128-U Firmware, Siemens Desigopxc200-E.d Firmware, Siemens Desigopxc50-E.d Firmware, Siemens Desigopxc64-U Firmware, Siemens Desigopxm20-E Firmware, Siemens Nucleus Net and 6 more. ## How do I fix CVE-2019-13939? No fix has been published for CVE-2019-13939 yet. Limit exposure of the affected software until one is available. ## Is CVE-2019-13939 being exploited? There is no known exploitation of CVE-2019-13939 in the wild and no public exploit code. ## Other vulnerabilities in Siemens APOGEE MEC/MBC/PXC (P2) - [CVE-2021-31884](https://insights.sbomify.com/CVE-2021-31884/): Memory corruption in APOGEE MBC (PPC) (BACnet) (critical 9.8) - [CVE-2021-31886](https://insights.sbomify.com/CVE-2021-31886/): Memory corruption in APOGEE MBC (PPC) (BACnet) (critical 9.8) - [CVE-2021-31887](https://insights.sbomify.com/CVE-2021-31887/): Memory corruption in APOGEE MBC (PPC) (BACnet) (high 8.8) - [CVE-2021-31888](https://insights.sbomify.com/CVE-2021-31888/): Memory corruption in APOGEE MBC (PPC) (BACnet) (high 8.8) - [CVE-2022-38371](https://insights.sbomify.com/CVE-2022-38371/): Denial of service in APOGEE MBC (PPC) (BACnet) (high 8.7) ## Fix prompt for AI coding agents ```text Check this codebase for CVE-2019-13939 and fix it if it is affected. What it is: CVE-2019-13939 is a high-severity denial of service vulnerability in Siemens APOGEE MEC/MBC/PXC (P2), published on 16 Jan 2020. 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-2019-13939 in the wild and no public exploit code. Affected product: Siemens APOGEE MEC/MBC/PXC (P2). 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-2019-13939/ (Markdown: https://insights.sbomify.com/CVE-2019-13939/index.md) ``` ## Sources - CVE record: https://www.cve.org/CVERecord?id=CVE-2019-13939 - NVD: https://nvd.nist.gov/vuln/detail/CVE-2019-13939 - OSV: https://osv.dev/vulnerability/CVE-2019-13939 --- From sbomify Insights: https://insights.sbomify.com/CVE-2019-13939/ Summaries are generated and may contain mistakes; the official description above is the record.