Cisco has released free software updates that address the vulnerability described in this advisory. Customers may only install and expect support for software versions and feature sets for which they have purchased a license. By installing, downloading, accessing, or otherwise using such software upgrades, customers agree to follow the terms of the Cisco software license: https://www.cisco.com/c/en/us/products/end-user-license-agreement.html

Additionally, customers may only download software for which they have a valid license, procured from Cisco directly, or through a Cisco authorized reseller or partner. In most cases this will be a maintenance upgrade to software that was previously purchased. Free security software updates do not entitle customers to a new software license, additional software feature sets, or major revision upgrades.

When considering software upgrades, customers are advised to regularly consult the advisories for Cisco products, which are available from the Cisco Security Advisories and Alerts page, to determine exposure and a complete upgrade solution.

In all cases, customers should ensure that the devices to be upgraded contain sufficient memory and confirm that current hardware and software configurations will continue to be supported properly by the new release. If the information is not clear, customers are advised to contact the Cisco Technical Assistance Center (TAC) or their contracted maintenance providers.

Customers Without Service Contracts

Customers who purchase directly from Cisco but do not hold a Cisco service contract and customers who make purchases through third-party vendors but are unsuccessful in obtaining fixed software through their point of sale should obtain upgrades by contacting the Cisco TAC: https://www.cisco.com/c/en/us/support/web/tsd-cisco-worldwide-contacts.html

Customers should have the product serial number available and be prepared to provide the URL of this advisory as evidence of entitlement to a free upgrade.

Fixed Releases

No upgrade action is necessary for customers who have already applied a recommended release to address the March 2019 Cisco FXOS and NX-OS Software bundle. See
Cisco Event Response: March 2019 Cisco FXOS and NX-OS Software Security Advisory Bundled Publication for a list of advisories in the bundle.

Customers who have not applied a recommended release to address the March 2019 bundle are advised to upgrade to an appropriate release as indicated in the applicable table in this section. In the following tables, the left column lists Cisco NX-OS Software releases. The right column indicates the first release that includes the fix for this vulnerability.

MDS 9000 Series Multilayer Switches: CSCvi99248

Cisco NX-OS Software Release First Fixed Release for This Vulnerability
5.2 6.2(25)
6.2 6.2(25)
7.3 8.3(2)
8.1 8.3(2)
8.2 8.3(2)
8.3 8.3(2)

Nexus 3000 Series Switches and Nexus 9000 Series Switches in Standalone NX-OS Mode: CSCvh24771

Cisco NX-OS Software Release First Fixed Release for This Vulnerability
Prior to 7.0(3)I7 7.0(3)I7(3)
7.0(3)I7 7.0(3)I7(3)
9.2(1) Not vulnerable

Nexus 3500 Platform Switches: CSCvi99250

Cisco NX-OS Software Release First Fixed Release for This Vulnerability
Prior to 6.0(2)A8 6.0(2)A8(11) 
6.0(2)A8 6.0(2)A8(11)
7.0(3) 7.0(3)I7(3)
9.2 Not vulnerable

Nexus 3600 Platform Switches and Nexus 9500 R-Series Switching Platform: CSCvi99247

Cisco NX-OS Software Release First Fixed Release for This Vulnerability
7.0(3) 9.2(1)
9.2 9.2(1)

Nexus 5500, 5600, and 6000 Series Switches: CSCvi99251

Cisco NX-OS Software Release First Fixed Release for This Vulnerability
Prior to 7.3 7.3(4)N1(1)
7.3 7.3(4)N1(1)

Nexus 7000 and 7700 Series Switches: CSCvi99248

Cisco NX-OS Software Release First Fixed Release for This Vulnerability
Prior to 6.2 6.2(22)
6.2 6.2(22)
7.2 7.3(3)D1(1)
7.3 7.3(3)D1(1)
8.0 8.2(3)
8.1 8.2(3)
8.2 8.2(3)
8.3 8.3(2)

UCS 6200, 6300, and 6400 Series Fabric Interconnects: CSCvi99252 and CSCvn11851

Cisco NX-OS Software Release First Fixed Release for This Vulnerability
Prior to 4.0 4.0(1d)
4.0 4.0(1d)

Additional Resources

For help determining the best Cisco NX-OS Software release for a Cisco Nexus Switch, administrators can refer to the following Recommended Releases documents. If a security advisory recommends a later release, Cisco recommends following the advisory guidance.

Cisco MDS Series Switches
Cisco Nexus 1000V for VMware Switch
Cisco Nexus 3000 Series and 3500 Series Switches
Cisco Nexus 5000 Series Switches
Cisco Nexus 5500 Platform Switches
Cisco Nexus 6000 Series Switches
Cisco Nexus 7000 Series Switches
Cisco Nexus 9000 Series Switches
Cisco Nexus 9000 Series ACI-Mode Switches

For help determining the best Cisco NX-OS Software release for Cisco UCS, refer to the Recommended Releases documents in the release notes for the device.