# CVE-2020-13529: Denial of service in Systemd > An attacker can cause a denial of service in Systemd's DHCP client by spoofing DHCP FORCERENEW and ACK packets to reconfigure the server. - **Severity:** Medium 6.1 (`CVSS:3.0/AV:A/AC:H/PR:N/UI:N/S:C/C:N/I:N/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:** Yes - **Published:** 10 May 2021 - **Updated:** 14 Oct 2026 - **Also known as:** ALSA-2021:4361, CLSA-2021-1635459240, DEBIAN-CVE-2020-13529, GHSA-44p7-qpr4-rgvf, OESA-2021-1319, RHSA-2021:4361, RLSA-2021:4361, UBUNTU-CVE-2020-13529 ## What is CVE-2020-13529? CVE-2020-13529 is a medium-severity denial of service vulnerability in Fedoraproject Fedora, published on 10 May 2021. It can only be exploited from the same machine or local network, with no action from the victim. ### Official description An exploitable denial-of-service vulnerability exists in Systemd 245. A specially crafted DHCP FORCERENEW packet can cause a server running the DHCP client to be vulnerable to a DHCP ACK spoofing attack. An attacker can forge a pair of FORCERENEW and DCHP ACK packets to reconfigure the server. Weakness: CWE-290 (Authentication Bypass by Spoofing) ## Which versions are affected by CVE-2020-13529? It affects 4 products. | Package | Ecosystem | Affected | Fixed in | | --- | --- | --- | --- | | `NetworkManager-cloud-setup` | AlmaLinux:8 | All versions | 1:1.32.10-4.el8 | | `NetworkManager-libnm-devel` | AlmaLinux:8 | All versions | 1:1.32.10-4.el8 | | `NetworkManager-adsl-debuginfo` | Red Hat:enterprise_linux:8::appstream | All versions | 1:1.32.10-4.el8 | | `NetworkManager-bluetooth-debuginfo` | Red Hat:enterprise_linux:8::appstream | All versions | 1:1.32.10-4.el8 | | `NetworkManager-cloud-setup` | Red Hat:enterprise_linux:8::appstream | All versions | 1:1.32.10-4.el8 | | `NetworkManager-cloud-setup-debuginfo` | Red Hat:enterprise_linux:8::appstream | All versions | 1:1.32.10-4.el8 | | `NetworkManager-debuginfo` | Red Hat:enterprise_linux:8::appstream | All versions | 1:1.32.10-4.el8 | | `NetworkManager-debugsource` | Red Hat:enterprise_linux:8::appstream | All versions | 1:1.32.10-4.el8 | | `NetworkManager-libnm-debuginfo` | Red Hat:enterprise_linux:8::appstream | All versions | 1:1.32.10-4.el8 | | `NetworkManager-ovs-debuginfo` | Red Hat:enterprise_linux:8::appstream | All versions | 1:1.32.10-4.el8 | | `NetworkManager-ppp-debuginfo` | Red Hat:enterprise_linux:8::appstream | All versions | 1:1.32.10-4.el8 | | `NetworkManager-team-debuginfo` | Red Hat:enterprise_linux:8::appstream | All versions | 1:1.32.10-4.el8 | | `NetworkManager-tui-debuginfo` | Red Hat:enterprise_linux:8::appstream | All versions | 1:1.32.10-4.el8 | | `NetworkManager-wifi-debuginfo` | Red Hat:enterprise_linux:8::appstream | All versions | 1:1.32.10-4.el8 | | `NetworkManager-wwan-debuginfo` | Red Hat:enterprise_linux:8::appstream | All versions | 1:1.32.10-4.el8 | | `NetworkManager` | Red Hat:enterprise_linux:8::baseos | All versions | 1:1.32.10-4.el8 | | `NetworkManager-adsl` | Red Hat:enterprise_linux:8::baseos | All versions | 1:1.32.10-4.el8 | | `NetworkManager-adsl-debuginfo` | Red Hat:enterprise_linux:8::baseos | All versions | 1:1.32.10-4.el8 | | `NetworkManager-bluetooth` | Red Hat:enterprise_linux:8::baseos | All versions | 1:1.32.10-4.el8 | | `NetworkManager-bluetooth-debuginfo` | Red Hat:enterprise_linux:8::baseos | All versions | 1:1.32.10-4.el8 | | `NetworkManager-cloud-setup-debuginfo` | Red Hat:enterprise_linux:8::baseos | All versions | 1:1.32.10-4.el8 | | `NetworkManager-config-connectivity-redhat` | Red Hat:enterprise_linux:8::baseos | All versions | 1:1.32.10-4.el8 | | `NetworkManager-config-server` | Red Hat:enterprise_linux:8::baseos | All versions | 1:1.32.10-4.el8 | | `NetworkManager-debuginfo` | Red Hat:enterprise_linux:8::baseos | All versions | 1:1.32.10-4.el8 | | `NetworkManager-debugsource` | Red Hat:enterprise_linux:8::baseos | All versions | 1:1.32.10-4.el8 | | `NetworkManager-dispatcher-routing-rules` | Red Hat:enterprise_linux:8::baseos | All versions | 1:1.32.10-4.el8 | | `NetworkManager-libnm` | Red Hat:enterprise_linux:8::baseos | All versions | 1:1.32.10-4.el8 | | `NetworkManager-libnm-debuginfo` | Red Hat:enterprise_linux:8::baseos | All versions | 1:1.32.10-4.el8 | | `NetworkManager-ovs` | Red Hat:enterprise_linux:8::baseos | All versions | 1:1.32.10-4.el8 | | `NetworkManager-ovs-debuginfo` | Red Hat:enterprise_linux:8::baseos | All versions | 1:1.32.10-4.el8 | | `NetworkManager-ppp` | Red Hat:enterprise_linux:8::baseos | All versions | 1:1.32.10-4.el8 | | `NetworkManager-ppp-debuginfo` | Red Hat:enterprise_linux:8::baseos | All versions | 1:1.32.10-4.el8 | | `NetworkManager-team` | Red Hat:enterprise_linux:8::baseos | All versions | 1:1.32.10-4.el8 | | `NetworkManager-team-debuginfo` | Red Hat:enterprise_linux:8::baseos | All versions | 1:1.32.10-4.el8 | | `NetworkManager-tui` | Red Hat:enterprise_linux:8::baseos | All versions | 1:1.32.10-4.el8 | | `NetworkManager-tui-debuginfo` | Red Hat:enterprise_linux:8::baseos | All versions | 1:1.32.10-4.el8 | | `NetworkManager-wifi` | Red Hat:enterprise_linux:8::baseos | All versions | 1:1.32.10-4.el8 | | `NetworkManager-wifi-debuginfo` | Red Hat:enterprise_linux:8::baseos | All versions | 1:1.32.10-4.el8 | | `NetworkManager-wwan` | Red Hat:enterprise_linux:8::baseos | All versions | 1:1.32.10-4.el8 | | `NetworkManager-wwan-debuginfo` | Red Hat:enterprise_linux:8::baseos | All versions | 1:1.32.10-4.el8 | Products: Fedoraproject Fedora, Netapp Active Iq Unified Manager, Netapp Cloud Backup, Systemd Project Systemd. ## How do I fix CVE-2020-13529? Apply the vendor's patch. ## Is CVE-2020-13529 being exploited? There is no known exploitation of CVE-2020-13529 in the wild and no public exploit code. ## Other vulnerabilities in Fedoraproject Fedora - [CVE-2024-4577](https://insights.sbomify.com/CVE-2024-4577/): PHP-CGI OS Command Injection (critical 9.8, exploited in the wild) - [CVE-2021-39226](https://insights.sbomify.com/CVE-2021-39226/): Grafana Authentication Bypass (critical 9.8, exploited in the wild) - [CVE-2019-5544](https://insights.sbomify.com/CVE-2019-5544/): VMware ESXi and Horizon DaaS OpenSLP Heap-Based Buffer Overflow (critical 9.8, exploited in the wild) - [CVE-2024-4947](https://insights.sbomify.com/CVE-2024-4947/): Google Chromium V8 Type Confusion (critical 9.6, exploited in the wild) - [CVE-2024-4671](https://insights.sbomify.com/CVE-2024-4671/): Google Chromium Visuals Use-After-Free (critical 9.6, exploited in the wild) ## Fix prompt for AI coding agents ```text Check this codebase for CVE-2020-13529 and fix it if it is affected. What it is: CVE-2020-13529 is a medium-severity denial of service vulnerability in Fedoraproject Fedora, published on 10 May 2021. 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-2020-13529 in the wild and no public exploit code. Affected product: Fedoraproject Fedora. 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-2020-13529/ (Markdown: https://insights.sbomify.com/CVE-2020-13529/index.md) ``` ## Sources - CVE record: https://www.cve.org/CVERecord?id=CVE-2020-13529 - NVD: https://nvd.nist.gov/vuln/detail/CVE-2020-13529 - OSV: https://osv.dev/vulnerability/CVE-2020-13529 --- From sbomify Insights: https://insights.sbomify.com/CVE-2020-13529/ Summaries are generated and may contain mistakes; the official description above is the record.