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 NX-OS Nexus 9000 Series | ||
| Cisco Nexus 92160YC Switch | ||
| Cisco Nexus 92300YC Firmware | ||
| Cisco Nexus 92304QC Switch | ||
| Cisco Nexus 92348GC-X Switch | ||
| Cisco Nexus 9236C Switch | ||
| Cisco Nexus 9272Q Switch | ||
| Cisco Nexus | ||
| Cisco Nexus 93108TC-EX-24 Firmware | ||
| Cisco Nexus 93108TC-FX Switch | ||
| Cisco Nexus 93108TC-FX Switch | ||
| Cisco Nexus 93108TC-FX3P Firmware | ||
| Cisco Nexus 93120TX Firmware | ||
| Cisco Nexus 93128 Firmware | ||
| Cisco Nexus 9316D-GX Firmware | ||
| Cisco Nexus 93180LC-EX Switch | ||
| Cisco Nexus 93180YC-EX-24 | ||
| Cisco Nexus 93180YC-EX-24 Firmware | ||
| Cisco Nexus 93180YC-FX Firmware | ||
| Cisco Nexus 93180YC-FX-24 Firmware | ||
| Cisco Nexus 93180YC-FX3 Firmware | ||
| Cisco Nexus 93180YC-FX3S Firmware | ||
| Cisco Nexus 93216TC-FX2 Firmware | ||
| Cisco Nexus 93240YC-FX2 Firmware | ||
| Cisco Nexus 9332C Firmware | ||
| Cisco Nexus 9332PQ Firmware | ||
| Cisco Nexus 93360YC-FX2 | ||
| Cisco Nexus 9336C-FX2 Firmware | ||
| Cisco Nexus 9336C-FX2-E Firmware | ||
| Cisco Nexus 9348GC-FXP Firmware | ||
| Cisco Nexus 93600CD-GX Firmware | ||
| Cisco Nexus 9364c-h1 | ||
| Cisco Nexus 9364C-GX Firmware | ||
| Cisco Nexus 9372PX-E | ||
| Cisco Nexus 9372PX-E Firmware | ||
| Cisco Nexus 9372TX | ||
| Cisco Nexus 9372TX-E Switch | ||
| Cisco Nexus 9396PX Firmware | ||
| Cisco Nexus 9396TX Firmware | ||
| Cisco Nexus 9508 |
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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
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- agent/weakness
- agent/description
- collector/mitre-cve
- source/MITRE
- agent/last-modified-date
- agent/first-publish-date
- agent/event
- agent/source
- agent/softwarecombine
- agent/tags
- collector/nvd-index
- agent/software-canonical-lookup-request
- vendor/cisco
- canonical/cisco nx-os
- version/cisco nx-os/15.0\(2e\)
- version/cisco nx-os/15.1\(1h\)
- canonical/cisco nx-os nexus 9000 series
- canonical/cisco nexus 92160yc switch
- canonical/cisco nexus 92300yc firmware
- canonical/cisco nexus 92304qc switch
- canonical/cisco nexus 92348gc-x switch
- canonical/cisco nexus 9236c switch
- canonical/cisco nexus 9272q switch
- canonical/cisco nexus
- canonical/cisco nexus 93108tc-ex-24 firmware
- canonical/cisco nexus 93108tc-fx switch
- canonical/cisco nexus 93108tc-fx3p firmware
- canonical/cisco nexus 93120tx firmware
- canonical/cisco nexus 93128 firmware
- canonical/cisco nexus 9316d-gx firmware
- canonical/cisco nexus 93180lc-ex switch
- canonical/cisco nexus 93180yc-ex-24
- canonical/cisco nexus 93180yc-ex-24 firmware
- canonical/cisco nexus 93180yc-fx firmware
- canonical/cisco nexus 93180yc-fx-24 firmware
- canonical/cisco nexus 93180yc-fx3 firmware
- canonical/cisco nexus 93180yc-fx3s firmware
- canonical/cisco nexus 93216tc-fx2 firmware
- canonical/cisco nexus 93240yc-fx2 firmware
- canonical/cisco nexus 9332c firmware
- canonical/cisco nexus 9332pq firmware
- canonical/cisco nexus 93360yc-fx2
- canonical/cisco nexus 9336c-fx2 firmware
- canonical/cisco nexus 9336c-fx2-e firmware
- canonical/cisco nexus 9348gc-fxp firmware
- canonical/cisco nexus 93600cd-gx firmware
- canonical/cisco nexus 9364c-h1
- canonical/cisco nexus 9364c-gx firmware
- canonical/cisco nexus 9372px-e
- canonical/cisco nexus 9372px-e firmware
- canonical/cisco nexus 9372tx
- canonical/cisco nexus 9372tx-e switch
- canonical/cisco nexus 9396px firmware
- canonical/cisco nexus 9396tx firmware
- canonical/cisco nexus 9508