CVE-2020-27827 Denial of service in lldp/openvswitch
High 7.5
Published
Updated
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)
Crafted LLDP packets cause memory loss in Open vSwitch, leading to denial of service and system unavailability.
- Exploited in the wild
- Not known
- Login needed
- Not needed
- Attackable
- Over the internet
- Victim action needed
- Not needed
- Fix
- Available
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
Which versions are affected by CVE-2020-27827?
It affects 17 products.
Linux distribution packages (40)
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 include Fedoraproject Fedora, Lldpd Project Lldpd, Openvswitch Openvswitch, Redhat Enterprise Linux, Redhat Openshift Container Platform, Redhat Openstack and 11 more.
How do I fix CVE-2020-27827?
Apply the vendor's patch.
Upgrade, then put limits on request size, rate and nesting depth so one client cannot exhaust the service. More about Denial of service.
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
Sources
Also known as AZL-10443, CLSA-2025-1757692387, DEBIAN-CVE-2020-27827, GHSA-m3mq-x6x3-4537, RHSA-2021:0976, RHSA-2021:1051 and 11 more.