CVE-2020-27121: Cisco Unified Communications Manager IM and Presence Service Denial of Service Vulnerability
First published: Fri Nov 06 2020(Updated: )
A vulnerability in Cisco Unified Communications Manager IM & Presence Service (Unified CM IM&P) Software could allow an authenticated, remote attacker to cause the Cisco XCP Authentication Service on an affected device to restart, resulting in a denial of service (DoS) condition. The vulnerability is due to improper handling of login requests. An attacker could exploit this vulnerability by sending a crafted client login request to an affected device. A successful exploit could allow the attacker to cause a process to crash, resulting in a DoS condition for new login attempts. Users who are authenticated at the time of the attack would not be affected. There are workarounds that address this vulnerability.
Credit: ykramarz@cisco.com
| Affected Software | Affected Version | How to fix |
|---|---|---|
| Cisco Unified Communications Manager IM and Presence Service | =12.5\(1\) |
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Reference Links
Frequently Asked Questions
What is the vulnerability ID for this Cisco Unified Communications Manager IM & Presence Service vulnerability?
The vulnerability ID is CVE-2020-27121.
What is the severity of CVE-2020-27121?
The severity of CVE-2020-27121 is medium, with a severity value of 6.5.
How can an attacker exploit CVE-2020-27121?
An authenticated, remote attacker can exploit CVE-2020-27121 to cause the Cisco XCP Authentication Service on an affected device to restart, resulting in a denial of service (DoS) condition.
Which software versions are affected by CVE-2020-27121?
The Cisco Unified Communications Manager IM & Presence Service version 12.5(1) is affected by CVE-2020-27121.
How can I fix CVE-2020-27121?
Cisco has released a security advisory with mitigation details for CVE-2020-27121. Please refer to the advisory for specific instructions.
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