CVE-2021-34756: Cisco Security Advisory: Cisco Firepower Threat Defense Software Command Injection Vulnerabilities

Cisco has released free software updates that address the vulnerabilities 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 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

In the following table(s), the left column lists Cisco software releases. The center column indicates whether a release is affected by the vulnerability described in this advisory and the first release that includes the fix for this vulnerability. The right column indicates whether a release is affected by any of the vulnerabilities described in this bundle and which release includes fixes for those vulnerabilities.

FTD Software

Cisco FTD Software Release

First Fixed Release for This Vulnerability

First Fixed Release for All Vulnerabilities Described in the Bundle of Advisories

6.2.2 and earlier1

Migrate to a fixed release.

Migrate to a fixed release.

6.2.3

Migrate to a fixed release.

Migrate to a fixed release.

6.3.01

Migrate to a fixed release.

Migrate to a fixed release.

6.4.0

6.4.0.13 (Nov 2021)

6.4.0.13 (Nov 2021)

6.5.01

Migrate to a fixed release.

Migrate to a fixed release.

6.6.0

6.6.5

6.6.5.1 (Nov 2021)

6.7.0

6.7.0.3 (Jan 2022)

6.7.0.3 (Jan 2022)

7.0.0

7.0.1

7.0.1

1. Cisco FMC and FTD Software releases 6.2.2 and earlier, as well as releases 6.3.0 and 6.5.0, have reached end of software maintenance. Customers are advised to migrate to a supported release that includes the fix for these vulnerabilities.

For instructions on upgrading your FTD device, see Cisco Firepower Management Center Upgrade Guide.

The Cisco Product Security Incident Response Team (PSIRT) validates only the affected and fixed release information that is documented in this advisory.