# CVE-2020-27827: Denial of service in lldp/openvswitch > Crafted LLDP packets cause memory loss in Open vSwitch, leading to denial of service and system unavailability. - **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:** Yes - **Published:** 18 Mar 2021 - **Updated:** 3 Dec 2025 - **Also known as:** AZL-10443, CLSA-2025-1757692387, DEBIAN-CVE-2020-27827, GHSA-m3mq-x6x3-4537, RHSA-2021:0976, RHSA-2021:1051, SUSE-SU-2021:0258-1, SUSE-SU-2021:0276-1, SUSE-SU-2021:0277-1, SUSE-SU-2021:0284-1, SUSE-SU-2021:0297-1, SUSE-SU-2021:0298-1, SUSE-SU-2021:0300-1, UBUNTU-CVE-2020-27827, openSUSE-SU-2021:0239-1, openSUSE-SU-2024:11024-1, openSUSE-SU-2024:11129-1 ## What is CVE-2020-27827? CVE-2020-27827 is a high-severity denial of service vulnerability in Fedoraproject Fedora, published on 18 Mar 2021. An attacker can exploit it over the internet without logging in, with no action from the victim. ### Official description A flaw was found in multiple versions of OpenvSwitch. Specially crafted LLDP packets can cause memory to be lost when allocating data to handle specific optional TLVs, potentially causing a denial of service. The highest threat from this vulnerability is to system availability. Weakness: CWE-400 (Uncontrolled Resource Consumption) ## Which versions are affected by CVE-2020-27827? It affects 17 products. | Package | Ecosystem | Affected | Fixed in | | --- | --- | --- | --- | | `redhat-virtualization-host` | Red Hat:enterprise_linux:7::hypervisor | All versions | 0:4.3.14-20210322.0.el7_9 | | `redhat-virtualization-host-image-update` | Red Hat:enterprise_linux:7::hypervisor | All versions | 0:4.3.14-20210322.0.el7_9 | | `redhat-virtualization-host` | Red Hat:rhev_hypervisor:4.4::el8 | All versions | 0:4.4.4-20210307.0.el8_3 | | `redhat-virtualization-host-image-update` | Red Hat:rhev_hypervisor:4.4::el8 | All versions | 0:4.4.4-20210307.0.el8_3 | | `openvswitch` | SUSE:Enterprise Storage 5 | All versions | 2.7.12-3.36.1 | | `openvswitch` | SUSE:Enterprise Storage 6 | All versions | 2.11.5-3.12.1 | | `openvswitch` | SUSE:HPE Helion OpenStack 8 | All versions | 2.7.12-3.36.1 | | `openvswitch` | SUSE:Linux Enterprise High Performance Computing 15 SP1-ESPOS | All versions | 2.11.5-3.12.1 | | `openvswitch` | SUSE:Linux Enterprise High Performance Computing 15 SP1-LTSS | All versions | 2.11.5-3.12.1 | | `openvswitch` | SUSE:Linux Enterprise High Performance Computing 15-ESPOS | All versions | 2.11.5-6.30.2 | | `openvswitch` | SUSE:Linux Enterprise High Performance Computing 15-LTSS | All versions | 2.11.5-6.30.2 | | `openvswitch` | SUSE:Linux Enterprise Module for Package Hub 15 SP2 | All versions | 2.11.5-3.12.1 | | `openvswitch` | SUSE:Linux Enterprise Module for Package Hub 15 SP2 | All versions | 2.13.2-9.11.1 | | `openvswitch` | SUSE:Linux Enterprise Module for Server Applications 15 SP2 | All versions | 2.13.2-9.11.1 | | `openvswitch` | SUSE:Linux Enterprise Server 12 SP2-BCL | All versions | 2.5.11-25.26.1 | | `openvswitch-dpdk` | SUSE:Linux Enterprise Server 12 SP2-BCL | All versions | 2.5.11-25.26.1 | | `openvswitch` | SUSE:Linux Enterprise Server 12 SP2-LTSS | All versions | 2.5.11-25.26.1 | | `openvswitch-dpdk` | SUSE:Linux Enterprise Server 12 SP2-LTSS | All versions | 2.5.11-25.26.1 | | `openvswitch` | SUSE:Linux Enterprise Server 12 SP3-BCL | All versions | 2.7.12-3.36.1 | | `openvswitch` | SUSE:Linux Enterprise Server 12 SP3-LTSS | All versions | 2.7.12-3.36.1 | | `openvswitch` | SUSE:Linux Enterprise Server 12 SP4-LTSS | All versions | 2.8.10-4.23.1 | | `openvswitch` | SUSE:Linux Enterprise Server 12 SP5 | All versions | 2.11.5-3.3.2 | | `openvswitch` | SUSE:Linux Enterprise Server 15 SP1-BCL | All versions | 2.11.5-3.12.1 | | `openvswitch` | SUSE:Linux Enterprise Server 15 SP1-LTSS | All versions | 2.11.5-3.12.1 | | `openvswitch` | SUSE:Linux Enterprise Server 15-LTSS | All versions | 2.11.5-6.30.2 | | `openvswitch` | SUSE:Linux Enterprise Server for SAP Applications 12 SP2 | All versions | 2.5.11-25.26.1 | | `openvswitch-dpdk` | SUSE:Linux Enterprise Server for SAP Applications 12 SP2 | All versions | 2.5.11-25.26.1 | | `openvswitch` | SUSE:Linux Enterprise Server for SAP Applications 12 SP3 | All versions | 2.7.12-3.36.1 | | `openvswitch` | SUSE:Linux Enterprise Server for SAP Applications 12 SP4 | All versions | 2.8.10-4.23.1 | | `openvswitch` | SUSE:Linux Enterprise Server for SAP Applications 12 SP5 | All versions | 2.11.5-3.3.2 | | `openvswitch` | SUSE:Linux Enterprise Server for SAP Applications 15 | All versions | 2.11.5-6.30.2 | | `openvswitch` | SUSE:Linux Enterprise Server for SAP Applications 15 SP1 | All versions | 2.11.5-3.12.1 | | `openvswitch` | SUSE:Manager Proxy 4.0 | All versions | 2.11.5-3.12.1 | | `openvswitch` | SUSE:Manager Retail Branch Server 4.0 | All versions | 2.11.5-3.12.1 | | `openvswitch` | SUSE:Manager Server 4.0 | All versions | 2.11.5-3.12.1 | | `openvswitch` | SUSE:OpenStack Cloud 7 | All versions | 2.5.11-25.26.1 | | `openvswitch-dpdk` | SUSE:OpenStack Cloud 7 | All versions | 2.5.11-25.26.1 | | `openvswitch` | SUSE:OpenStack Cloud 8 | All versions | 2.7.12-3.36.1 | | `openvswitch` | SUSE:OpenStack Cloud 9 | All versions | 2.8.10-4.23.1 | | `openvswitch` | SUSE:OpenStack Cloud Crowbar 8 | All versions | 2.7.12-3.36.1 | Products: Fedoraproject Fedora, Lldpd Project Lldpd, Openvswitch Openvswitch, Redhat Enterprise Linux, Redhat Openshift Container Platform, Redhat Openstack, Redhat Virtualization, Siemens Simatic Hmi Unified Comfort Panels Firmware, Siemens Simatic Net Cp 1243-1 Firmware, Siemens Simatic Net Cp 1243-8 Irc Firmware, Siemens Simatic Net Cp 1542sp-1 Firmware, Siemens Simatic Net Cp 1542sp-1 Irc Firmware, Siemens Simatic Net Cp 1543-1 Firmware, Siemens Simatic Net Cp 1543sp-1 Firmware, Siemens Simatic Net Cp 1545-1 Firmware, Siemens Sinumerik One Firmware, Siemens Tim 1531 Irc Firmware. ## How do I fix CVE-2020-27827? Apply the vendor's patch. ## Is CVE-2020-27827 being exploited? There is no known exploitation of CVE-2020-27827 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-2020-27827 and fix it if it is affected. What it is: CVE-2020-27827 is a high-severity denial of service vulnerability in Fedoraproject Fedora, published on 18 Mar 2021. 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-2020-27827 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-2020-27827/ (Markdown: https://insights.sbomify.com/CVE-2020-27827/index.md) ``` ## Sources - CVE record: https://www.cve.org/CVERecord?id=CVE-2020-27827 - NVD: https://nvd.nist.gov/vuln/detail/CVE-2020-27827 - OSV: https://osv.dev/vulnerability/CVE-2020-27827 --- From sbomify Insights: https://insights.sbomify.com/CVE-2020-27827/ Summaries are generated and may contain mistakes; the official description above is the record.