CVE-2021-1524 Cisco Meeting Server API Denial of Service Vulnerability

What is CVE-2021-1524?

CVE-2021-1524 is a medium-severity denial of service vulnerability in Cisco Meeting Server, published on 16 Jun 2021. Any signed-in user can exploit it over the network, with no action from the victim.

Official description

A vulnerability in the API of Cisco Meeting Server could allow an authenticated, remote attacker to cause a denial of service (DoS) condition on an affected device. This vulnerability exists because requests that are sent to the API are not properly validated. An attacker could exploit this vulnerability by sending a malicious request to the API. A successful exploit could allow the attacker to cause all participants on a call to be disconnected, resulting in a DoS condition.

Weakness: CWE-20

Which versions are affected by CVE-2021-1524?

It affects 1 product.

Products include Cisco Meeting Server.

How do I fix CVE-2021-1524?

No fix has been published for CVE-2021-1524 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-2021-1524 being exploited?

There is no known exploitation of CVE-2021-1524 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 Critical 9.8
• CVE-2017-12249 Misconfiguration in Cisco Meeting Server Critical 9.1
• 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 Critical 9.1
• CVE-2018-0439 Cisco Meeting Server Cross-Site Request Forgery Vulnerability High 8.8
• CVE-2016-6444 Cross-site request forgery in Cisco Meeting Server 1.8, 1.9, 2.0 High 8.8

Sources

• CVE record
• NVD
• OSV
• GitHub advisory
• How this page is made

Also known as GHSA-cqqf-7hc8-ww46.