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A vulnerability within the Endpoint Learning feature of Cisco Nexus 9000 Series Switches running in Application Centric Infrastructure (ACI) mode could allow an unauthenticated, remote attacker to cause a denial of service (DoS) condition on an endpoint device in certain circumstances. The vulnerability is due to improper endpoint learning when packets are received on a specific port from outside the ACI fabric and destined to an endpoint located on a border leaf when Disable Remote Endpoint Learning has been enabled. This can result in a Remote (XR) entry being created for the impacted endpoint that will become stale if the endpoint migrates to a different port or leaf switch. This results in traffic not reaching the impacted endpoint until the Remote entry can be relearned by another mechanism.
Cite this page
CVE-2019-1977. CVEDatabase.com. Retrieved 1 May 2026. https://cvedatabase.com/cve/CVE-2019-1977
Use CWE-371, Cisco vendor hub and Nx-Os product page to widen CVE-2019-1977 into its surrounding weakness, vendor, and product context.
Compare it with CVE-2023-44487, CVE-2024-20399 and CVE-2024-20321 for nearby disclosures in the same product family.