What is CVE-2021-40122?

CVE-2021-40122 is a vulnerability in the Call Bridge feature of Cisco Meeting Server that could allow an unauthenticated attacker to cause a denial of service (DoS) condition.

How severe is CVE-2021-40122?

CVE-2021-40122 has a severity score of 7.5, indicating a high severity.

What software is affected by CVE-2021-40122?

Cisco Meeting Server versions up to and including 3.2.3 are affected by CVE-2021-40122.

How can an attacker exploit CVE-2021-40122?

An attacker can exploit CVE-2021-40122 by sending a large series of message requests to the API of the Call Bridge feature of Cisco Meeting Server.

Is there a fix for CVE-2021-40122?

Yes, Cisco has released a security advisory with mitigation details for CVE-2021-40122. Please refer to the reference link for more information.

Vulnerability/
CVE-2021-40122

high

7.5

CWE

404 399

21/10/2021

7/11/2024

CVE-2021-40122: Cisco Meeting Server Call Bridge Denial of Service Vulnerability

First published: Thu Oct 21 2021(Updated: )

A vulnerability in an API of the Call Bridge feature of Cisco Meeting Server could allow an unauthenticated, remote attacker to cause a denial of service (DoS) condition. This vulnerability is due to improper handling of large series of message requests. An attacker could exploit this vulnerability by sending a series of messages to the vulnerable API. A successful exploit could allow the attacker to cause the affected device to reload, dropping all ongoing calls and resulting in a DoS condition.

Credit: ykramarz@cisco.com

Affected Software	Affected Version	How to fix
Cisco Meeting Server	<=3.1
Cisco Meeting Server	>=3.2<3.2.3

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Reference Links

https://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-cms-LAHe8z5v

Frequently Asked Questions

What is CVE-2021-40122?
CVE-2021-40122 is a vulnerability in the Call Bridge feature of Cisco Meeting Server that could allow an unauthenticated attacker to cause a denial of service (DoS) condition.
How severe is CVE-2021-40122?
CVE-2021-40122 has a severity score of 7.5, indicating a high severity.
What software is affected by CVE-2021-40122?
Cisco Meeting Server versions up to and including 3.2.3 are affected by CVE-2021-40122.
How can an attacker exploit CVE-2021-40122?
An attacker can exploit CVE-2021-40122 by sending a large series of message requests to the API of the Call Bridge feature of Cisco Meeting Server.
Is there a fix for CVE-2021-40122?
Yes, Cisco has released a security advisory with mitigation details for CVE-2021-40122. Please refer to the reference link for more information.

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