CVE-2019-1977
First published: Fri Aug 30 2019(Updated: )
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.
Credit: ykramarz@cisco.com
| Affected Software | Affected Version | How to fix |
|---|---|---|
| Cisco Nx-os | =12.3\(1h\) | |
| Cisco Nx-os | =13.1\(2m\) | |
| Cisco Nx-os | =13.1\(2o\) | |
| Cisco Nx-os | =13.1\(2p\) | |
| Cisco Nexus 9000 | ||
| Cisco Nexus 93108tc-ex | ||
| Cisco Nexus 93108tc-fx | ||
| Cisco Nexus 93120tx | ||
| Cisco Nexus 93128tx | ||
| Cisco Nexus 93180lc-ex | ||
| Cisco Nexus 93180yc-ex | ||
| Cisco Nexus 93180yc-fx | ||
| Cisco Nexus 9332pq | ||
| Cisco Nexus 9336c-fx2 | ||
| Cisco Nexus 9336pq | ||
| Cisco Nexus 9348gc-fxp | ||
| Cisco Nexus 9364c | ||
| Cisco Nexus 9372px | ||
| Cisco Nexus 9372px-e | ||
| Cisco Nexus 9372tx | ||
| Cisco Nexus 9372tx-e | ||
| Cisco Nexus 9396px | ||
| Cisco Nexus 9396tx | ||
| Cisco Nexus 9504 | ||
| Cisco Nexus 9508 | ||
| Cisco Nexus 9516 |
Never miss a vulnerability like this again
Sign up to SecAlerts for real-time vulnerability data matched to your software, aggregated from hundreds of sources.
Reference Links
Frequently Asked Questions
What is the vulnerability ID for this Cisco Nexus 9000 Series Switches vulnerability?
The vulnerability ID is CVE-2019-1977.
What is the severity of CVE-2019-1977?
The severity of CVE-2019-1977 is high with a CVSS score of 7.5.
What is the affected software for CVE-2019-1977?
The affected software for CVE-2019-1977 is Cisco Nexus 9000 Series Switches running in Application Centric Infrastructure (ACI) mode.
What is the impact of CVE-2019-1977?
CVE-2019-1977 could allow an unauthenticated, remote attacker to cause a denial of service (DoS) condition on an endpoint device in certain circumstances.
How can I fix CVE-2019-1977?
There is currently no fix available for CVE-2019-1977, but Cisco has provided mitigations in their advisory.
- collector/nvd-index
- agent/severity
- agent/author
- agent/references
- agent/tags
- agent/description
- agent/weakness
- agent/type
- agent/event
- agent/last-modified-date
- agent/softwarecombine
- agent/first-publish-date
- vendor/cisco
- canonical/cisco nx-os
- version/cisco nx-os/12.3\(1h\)
- version/cisco nx-os/13.1\(2m\)
- version/cisco nx-os/13.1\(2o\)
- version/cisco nx-os/13.1\(2p\)
- canonical/cisco nexus 9000
- canonical/cisco nexus 93108tc-ex
- canonical/cisco nexus 93108tc-fx
- canonical/cisco nexus 93120tx
- canonical/cisco nexus 93128tx
- canonical/cisco nexus 93180lc-ex
- canonical/cisco nexus 93180yc-ex
- canonical/cisco nexus 93180yc-fx
- canonical/cisco nexus 9332pq
- canonical/cisco nexus 9336c-fx2
- canonical/cisco nexus 9336pq
- canonical/cisco nexus 9348gc-fxp
- canonical/cisco nexus 9364c
- canonical/cisco nexus 9372px
- canonical/cisco nexus 9372px-e
- canonical/cisco nexus 9372tx
- canonical/cisco nexus 9372tx-e
- canonical/cisco nexus 9396px
- canonical/cisco nexus 9396tx
- canonical/cisco nexus 9504
- canonical/cisco nexus 9508
- canonical/cisco nexus 9516