CVE-2021-40122 Cisco Meeting Server Call Bridge Denial of Service Vulnerability
Unauthenticated remote attackers can cause a denial of service by sending large message series to the Call Bridge API, dropping ongoing calls.
- Exploited in the wild
- Not known
- Login needed
- Not needed
- Attackable
- Over the internet
- Victim action needed
- Not needed
- Fix
- None listed
What is CVE-2021-40122?
CVE-2021-40122 is a medium-severity denial of service vulnerability in Cisco Meeting Server, published on 21 Oct 2021. An attacker can exploit it over the internet without logging in, with no action from the victim.
Official description
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.
Which versions are affected by CVE-2021-40122?
It affects 1 product.
Products include Cisco Meeting Server.
How do I fix CVE-2021-40122?
No fix has been published for CVE-2021-40122 yet. Limit exposure of the affected software until one is available.
Upgrade, then put limits on request size, rate and nesting depth so one client cannot exhaust the service. More about Denial of service.
Is CVE-2021-40122 being exploited?
There is no known exploitation of CVE-2021-40122 in the wild and no public exploit code.
Other vulnerabilities in Cisco Meeting Server
- CVE-2016-6448 Memory corruption in Cisco Meeting Server before 2.0.3 and Acano Server before 1.9.5
- CVE-2017-12249 Misconfiguration in Cisco Meeting Server
- CVE-2016-6445 Auth bypass in Cisco Meeting Server (CMS) before 2.0.6 and Acano Server before 1.8.18 and 1.9.x before 1.9.6
- CVE-2018-0439 Cisco Meeting Server Cross-Site Request Forgery Vulnerability
- CVE-2016-6444 Cross-site request forgery in Cisco Meeting Server 1.8, 1.9, 2.0
Sources
Also known as GHSA-3rqh-cwpr-p993.