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1. #Cisco ios xe software install
2. #Cisco ios xe software software
3. #Cisco ios xe software password
4. #Cisco ios xe software series

#Cisco ios xe software software

Customers should not deploy any workarounds or mitigations before first evaluating the applicability to their own environment and any impact to such environment.Ĭisco has released free software updates that address the vulnerability described in this advisory. Customers should be aware that any workaround or mitigation that is implemented may negatively impact the functionality or performance of their network based on intrinsic customer deployment scenarios and limitations. While this workaround and this mitigation have been deployed and were proven successful in a test environment, customers should determine the applicability and effectiveness in their own environment and under their own use conditions. For more information, see NETCONF and RESTCONF Service-Level ACLs. There is also a mitigation that addresses this vulnerability: To limit the attack surface of this vulnerability, ensure that access control lists (ACLs) are in place for NETCONF and RESTCONF to prevent attempted access from untrusted subnets. For more information, see Cisco Guide to Harden Cisco IOS Devices.

#Cisco ios xe software password

There is a workaround that addresses this vulnerability: Remove the enable password and configure an enable secret. Note: If enable secret is being used without the presence of enable password, the device is not affected. To determine whether enable password is configured on the device without the presence of an enable secret, use the show running-config | include enable password|secret command, as shown in the following example: Router# show running-config | include enable password|secret To determine whether NETCONF or RESTCONF is configured on the device, use the show running-config | include netconf|restconf command, as shown in the following example: Router# show running-config | include netconf|restconf To determine whether AAA authentication is configured on the device, use the show running-config | include aaa authentication login command, as shown in the following example: Router# show running-config | include aaa authentication loginĪaa authentication login default local group example To determine whether a device has a vulnerable configuration, do the following:

#Cisco ios xe software install

For additional information, see the Install and Upgrade Cisco IOS XE Release 17.2.1r and Later chapter of the Cisco SD-WAN Getting Started Guide. The SD-WAN feature set was first integrated into the universal Cisco IOS XE Software releases starting with IOS XE Software Release 17.2.1r. Note: The standalone Cisco IOS XE SD-WAN release images are separate from the universal Cisco IOS XE Software releases. For either to be affected, all of the following must be configured:įor information about which Cisco software releases are vulnerable, see the Fixed Software section of this advisory. This vulnerability affects Cisco IOS XE Software if it is running in autonomous or controller mode and Cisco IOS XE SD-WAN Software. For a complete list of the advisories and links to them, see Cisco Event Response: September 2021 Semiannual Cisco IOS and IOS XE Software Security Advisory Bundled Publication. This advisory is part of the September 2021 release of the Cisco IOS and IOS XE Software Security Advisory Bundled Publication. This advisory is available at the following link: There are workarounds that address this vulnerability. A successful exploit could allow the attacker to use NETCONF or RESTCONF to install, manipulate, or delete the configuration of a network device or to corrupt memory on the device, resulting a DoS.Ĭisco has released software updates that address this vulnerability.

#Cisco ios xe software series

An attacker could exploit this vulnerability by sending a series of NETCONF or RESTCONF requests to an affected device. This vulnerability is due to an uninitialized variable.