CVE-2021-1586: Cisco Nexus 9000 Series Fabric Switches ACI Mode Multi-Pod and Multi-Site TCP Denial of Service Vulnerability
First published: Wed Aug 25 2021(Updated: )
A vulnerability in the Multi-Pod or Multi-Site network configurations for Cisco Nexus 9000 Series Fabric Switches in Application Centric Infrastructure (ACI) mode could allow an unauthenticated, remote attacker to unexpectedly restart the device, resulting in a denial of service (DoS) condition. This vulnerability exists because TCP traffic sent to a specific port on an affected device is not properly sanitized. An attacker could exploit this vulnerability by sending crafted TCP data to a specific port that is listening on a public-facing IP address for the Multi-Pod or Multi-Site configuration. A successful exploit could allow the attacker to cause the device to restart unexpectedly, resulting in a DoS condition.
Credit: ykramarz@cisco.com
| Affected Software | Affected Version | How to fix |
|---|---|---|
| Cisco Nx-os | =15.0\(2e\) | |
| Cisco Nx-os | =15.1\(1h\) | |
| Cisco Nexus 9000v | ||
| Cisco Nexus 92160yc-x | ||
| Cisco Nexus 92300yc | ||
| Cisco Nexus 92304qc | ||
| Cisco Nexus 92348gc-x | ||
| Cisco Nexus 9236c | ||
| Cisco Nexus 9272q | ||
| Cisco Nexus 93108tc-ex | ||
| Cisco Nexus 93108tc-ex-24 | ||
| Cisco Nexus 93108tc-fx | ||
| Cisco Nexus 93108tc-fx-24 | ||
| Cisco Nexus 93108tc-fx3p | ||
| Cisco Nexus 93120tx | ||
| Cisco Nexus 93128tx | ||
| Cisco Nexus 9316d-gx | ||
| Cisco Nexus 93180lc-ex | ||
| Cisco Nexus 93180yc-ex | ||
| Cisco Nexus 93180yc-ex-24 | ||
| Cisco Nexus 93180yc-fx | ||
| Cisco Nexus 93180yc-fx-24 | ||
| Cisco Nexus 93180yc-fx3 | ||
| Cisco Nexus 93180yc-fx3s | ||
| Cisco Nexus 93216tc-fx2 | ||
| Cisco Nexus 93240yc-fx2 | ||
| Cisco Nexus 9332c | ||
| Cisco Nexus 9332pq | ||
| Cisco Nexus 93360yc-fx2 | ||
| Cisco Nexus 9336c-fx2 | ||
| Cisco Nexus 9336c-fx2-e | ||
| Cisco Nexus 9348gc-fxp | ||
| Cisco Nexus 93600cd-gx | ||
| Cisco Nexus 9364c | ||
| Cisco Nexus 9364c-gx | ||
| Cisco Nexus 9372px | ||
| Cisco Nexus 9372px-e | ||
| Cisco Nexus 9372tx | ||
| Cisco Nexus 9372tx-e | ||
| Cisco Nexus 9396px | ||
| Cisco Nexus 9396tx | ||
| Cisco Nexus 9508 |
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 CVE-2021-1586?
CVE-2021-1586 is a vulnerability in the Multi-Pod or Multi-Site network configurations for Cisco Nexus 9000 Series Fabric Switches in Application Centric Infrastructure (ACI) mode.
What is the severity of CVE-2021-1586?
The severity of CVE-2021-1586 is high, with a severity value of 8.6.
How can an unauthenticated, remote attacker exploit CVE-2021-1586?
An unauthenticated, remote attacker can exploit CVE-2021-1586 to unexpectedly restart the device, resulting in a denial of service (DoS) condition.
Which software versions are affected by CVE-2021-1586?
CVE-2021-1586 affects Cisco Nexus 9000 Series Fabric Switches running Cisco NX-OS 15.0(2e) and 15.1(1h).
Where can I find more information about CVE-2021-1586?
You can find more information about CVE-2021-1586 on the Cisco Security Advisory page: https://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-n9kaci-tcp-dos-YXukt6gM
- collector/nvd-index
- agent/type
- agent/softwarecombine
- collector/mitre-cve
- source/MITRE
- agent/remedy
- agent/severity
- agent/references
- agent/author
- agent/title
- agent/weakness
- agent/last-modified-date
- agent/description
- agent/first-publish-date
- agent/event
- agent/tags
- vendor/cisco
- canonical/cisco nx-os
- version/cisco nx-os/15.0\(2e\)
- version/cisco nx-os/15.1\(1h\)
- canonical/cisco nexus 9000v
- canonical/cisco nexus 92160yc-x
- canonical/cisco nexus 92300yc
- canonical/cisco nexus 92304qc
- canonical/cisco nexus 92348gc-x
- canonical/cisco nexus 9236c
- canonical/cisco nexus 9272q
- canonical/cisco nexus 93108tc-ex
- canonical/cisco nexus 93108tc-ex-24
- canonical/cisco nexus 93108tc-fx
- canonical/cisco nexus 93108tc-fx-24
- canonical/cisco nexus 93108tc-fx3p
- canonical/cisco nexus 93120tx
- canonical/cisco nexus 93128tx
- canonical/cisco nexus 9316d-gx
- canonical/cisco nexus 93180lc-ex
- canonical/cisco nexus 93180yc-ex
- canonical/cisco nexus 93180yc-ex-24
- canonical/cisco nexus 93180yc-fx
- canonical/cisco nexus 93180yc-fx-24
- canonical/cisco nexus 93180yc-fx3
- canonical/cisco nexus 93180yc-fx3s
- canonical/cisco nexus 93216tc-fx2
- canonical/cisco nexus 93240yc-fx2
- canonical/cisco nexus 9332c
- canonical/cisco nexus 9332pq
- canonical/cisco nexus 93360yc-fx2
- canonical/cisco nexus 9336c-fx2
- canonical/cisco nexus 9336c-fx2-e
- canonical/cisco nexus 9348gc-fxp
- canonical/cisco nexus 93600cd-gx
- canonical/cisco nexus 9364c
- canonical/cisco nexus 9364c-gx
- 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 9508