Cisco has released Vulnerability-related.PatchVulnerability fixes for 34 flaws in its software , including 24 that affect Vulnerability-related.DiscoverVulnerability its FXOS software for Firepower firewalls and NX-OS software for Nexus switches . Cisco 's June updates include fixes for five critical arbitrary code execution vulnerabilities affecting Vulnerability-related.DiscoverVulnerability FXOS and NX-OS and 19 high-rated flaws affecting Vulnerability-related.DiscoverVulnerability the software . Four of the critical flaws affect Vulnerability-related.DiscoverVulnerability FXOS and NX-OS Cisco Fabric Services , while the fifth one affects Vulnerability-related.DiscoverVulnerability the NX-API feature of NX-OS . All have a CVSS v3 score of 9.8 out of a maximum of 10 . Cisco Fabric Services facilitate distribution and synchronization of configuration data between Cisco devices on the same network . Some of the flaws allow an unauthenticated , remote attack to execute arbitrary code and one allows an attacker to do so as root . Multiple switches are vulnerable Vulnerability-related.DiscoverVulnerability if they 've been configured to use Cisco Fabric Services , including its Nexus 2000 series through to Nexus 9000 series switches , as well as Cisco 's Firepower 4100 Series Next-Gen Firewalls and other hardware . The insufficient input validation may occur when FXOS and NX-OS process Cisco Fabric Services packets received during distribution and synchronization . There are various ways to exploit each of the flaws , depending on what Cisco Fabric Services distribution types have been configured . For example , if Fibre Channel ports are configured as a distribution type for a device , the attack could occur via Fibre Channel over Ethernet ( FCoE ) or Fibre Channel over IP ( FCIP ) . Cisco has already rolled out Vulnerability-related.PatchVulnerability fixes in some releases of FXOS and NX-OS . Cisco posted a blog this week explaining why it often fixes Vulnerability-related.PatchVulnerability bugs in IOS and NX-OS releases before disclosing Vulnerability-related.DiscoverVulnerability them in an advisory . It 's a practice that appears to cause confusion for customers wondering why it has n't told them fixed code has been available Vulnerability-related.PatchVulnerability for several months before it discloses Vulnerability-related.DiscoverVulnerability them . Cisco 's answer is that some flaws affect Vulnerability-related.DiscoverVulnerability more than 50 versions of its software . `` There have been some questions as to why creating Vulnerability-related.PatchVulnerability fixes and releasing Vulnerability-related.PatchVulnerability updates can take several weeks , or sometimes even months , before an advisory is published , '' Cisco 's Customer Assurance Security Programs team wrote . `` In some cases , there is a large number of supported software versions to be updated . The number of affected versions that will be updated Vulnerability-related.PatchVulnerability can range from single digits to nearly 50 or more . We are committed to issuing Vulnerability-related.PatchVulnerability fixes for every one of those supported versions . '' `` If we disclosed Vulnerability-related.DiscoverVulnerability the vulnerability after only fixing Vulnerability-related.PatchVulnerability one release , we would unnecessarily expose all customers running Vulnerability-related.PatchVulnerability other releases to potential exploitation once details about the attack itself became public . '' There are also 10 medium-severity flaws , including one that affects Vulnerability-related.DiscoverVulnerability some WebEx endpoints due to an already disclosed flaw in Nvidia 's Tegra TX1 chips .