Cisco Unified Communications Manager contains a vulnerability that could allow an unauthenticated, remote attacker to cause a denial of service condition. Updates are available.
A vulnerability in device authentication of Cisco Unified Communications Manager (CUCM) could allow an unauthenticated, remote attacker to impact application response.
The vulnerability is due to incomplete throttling of authentication requests. An attacker could exploit this vulnerability by sending multiple authentication requests in a short period of time. An exploit could allow the attacker to degrade the performance of the CUCM application.
Cisco has confirmed the vulnerability in a security notice and has released software updates.
At the time this alert was first published, Cisco CUCM versions 9.1(1) and prior were vulnerable. Later versions of Cisco CUCM may also be affected.
To exploit this vulnerability, an attacker may require access to a trusted, internal network to send authentication requests to the targeted system. This access requirement could limit the likelihood of a successful exploit.
Customers are advised to review the bug report in the "Vendor Announcements" section for a current list of affected versions.
An unauthenticated, remote attacker could exploit this vulnerability to degrade the performance of the CUCM application, impacting the application response time, which could result in a denial of service condition.
The vulnerability is due to incomplete throttling of authentication requests processed by the affected software.
An unauthenticated, remote attacker could exploit this vulnerability by sending a series of authentication requests to a targeted system in a short time frame. Processing the multiple requests could degrade the performance of the CUCM application, resulting in a DoS condition.
Administrators are advised to apply the appropriate updates.
Administrators are advised to allow only trusted users to have network access.
Administrators are advised to monitor affected systems.
Cisco customers with active contracts should contact their Cisco support team for assistance in upgrading to a software version that includes fixes for this vulnerability. Cisco customers without contracts may contact the Cisco Technical Assistance Center at 1-800-553-2447 or 1-408-526-7209 or via e-mail at firstname.lastname@example.org for assistance.
The security vulnerability applies to the following combinations of products.
Cisco Unified Communications Manager
8.5 Base | 8.6 Base | 9.0 Base | 9.0(1) Base | 9.1 Base | 9.1(1) Base
The urgency and severity ratings of this alert are not tailored to individual users; users may value alerts differently based upon their network configurations and circumstances. THE ALERT, AND INFORMATION CONTAINED THEREIN, ARE PROVIDED ON AN "AS IS" BASIS AND DO NOT IMPLY ANY KIND OF GUARANTEE OR WARRANTY, INCLUDING THE WARRANTIES OF MERCHANTABILITY OR FITNESS FOR A PARTICULAR USE. YOUR USE OF THE ALERT, AND INFORMATION CONTAINED THEREIN, OR MATERIALS LINKED FROM THE ALERT, IS AT YOUR OWN RISK. INFORMATION IN THIS ALERT AND ANY RELATED COMMUNICATIONS IS BASED ON OUR KNOWLEDGE AT THE TIME OF PUBLICATION AND IS SUBJECT TO CHANGE WITHOUT NOTICE. CISCO RESERVES THE RIGHT TO CHANGE OR UPDATE ALERTS AT ANY TIME.