- #Cisco ios software checker how to
- #Cisco ios software checker install
- #Cisco ios software checker code
- #Cisco ios software checker license
- #Cisco ios software checker series
#Cisco ios software checker install
Customers may only install and expect support for software versions and feature sets for which they have purchased a license. 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 has been deployed and was proven successful in a test environment, customers should determine the applicability and effectiveness in their own environment and under their own use conditions. The Tcl script is available for download at the following link: When Cisco IOS EEM detects potential exploitation of this vulnerability, the policy sends an alert to the network administrator, who can then decide to implement an upgrade, implement suitable mitigations, or reload the device to clear the input queue. The policy allows administrators to monitor interfaces for devices running Cisco IOS Software and detect when input queues are full. Router(config)# interface gigabitEthernet 1Ī Cisco IOS Embedded Event Manager (EEM) policy that is based on Tool Command Language (Tcl) can be used on affected devices running Cisco IOS Software to detect and identify interface queue wedges that are caused by this vulnerability.
#Cisco ios software checker how to
The following example shows how to set the value to 350 by using the hold-queue in interface configuration command: Router# configure terminal If this vulnerability has been exploited and the attack has stopped, administrators can set a maximum hold-queue value that is greater than the currently configured value for the affected interface to allow traffic to pass until a reload can be scheduled. If the device is running Cisco IOS XE Software Release 17.3.1 or later, there are no workarounds that address this vulnerability.
#Cisco ios software checker license
If a device is running a Cisco IOS XE Software release earlier than Release 17.3.1, changing the license level to one that supports Autonomic Networking, such as adventerprise, can be used as a workaround. The following example shows the output if a device supports Autonomic Networking: Router# show running-config all | include autonomic The following example shows the output of the command for a device that is running Cisco IOS XE Software and does not support Autonomic Networking: Router# show running-config all | include autonomic To determine whether a device does not support Autonomic Networking, use the show running-config all | include autonomic command in the CLI. If the device is running a Cisco IOS XE Software release earlier than Release 17.3.1, it is considered vulnerable only if it does not support Autonomic Networking.įor information about which Cisco software releases are vulnerable, see the Fixed Software section of this advisory. In addition, if the device is running Cisco IOS XE Software Release 17.3.1 or a later release that is earlier than the first fixed release, the device is considered vulnerable.
#Cisco ios software checker series
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1000 Integrated Services Routers (ISRs).This vulnerability affects Cisco IOS XE Software if it is running on one of the following Cisco products: 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 cause a queue wedge on the interface, resulting in a DoS condition.Ĭisco has released software updates that address this vulnerability. An attacker could exploit this vulnerability by sending specific Layer 2 frames on the segment the router is connected to. This vulnerability is due to improper handling of certain Layer 2 frames.
#Cisco ios software checker code
A vulnerability in the Layer 2 punt code of Cisco IOS XE Software could allow an unauthenticated, adjacent attacker to cause a queue wedge on an interface that receives specific Layer 2 frames, resulting in a denial of service (DoS) condition.