CVE-2019-1721 Cisco Expressway Series and Cisco TelePresence Video Communication Server Denial of Service Vulnerability
An authenticated remote attacker can cause a denial of service by sending crafted XML in SIP messages, exhausting CPU resources on Cisco Expressway and VCS systems.
- Exploited in the wild
- Not known
- Login needed
- Any signed-in user
- Attackable
- Over the internet
- Victim action needed
- Not needed
- Fix
- None listed
What is CVE-2019-1721?
CVE-2019-1721 is a high-severity denial of service vulnerability in Cisco TelePresence Video Communication Server (VCS), published on 18 Apr 2019. Any signed-in user can exploit it over the network, with no action from the victim.
Official description
A vulnerability in the phone book feature of Cisco Expressway Series and Cisco TelePresence Video Communication Server (VCS) could allow an authenticated, remote attacker to cause the CPU to increase to 100% utilization, causing a denial of service (DoS) condition on an affected system. The vulnerability is due to improper handling of the XML input. An attacker could exploit this vulnerability by sending a Session Initiation Protocol (SIP) message with a crafted XML payload to an affected device. A successful exploit could allow the attacker to exhaust CPU resources, resulting in a DoS condition. Manual intervention may be required to recover the device. This vulnerability is fixed in Cisco Expressway Series and Cisco TelePresence Video Communication Server Releases X12.5.1 and later.
Weakness: CWE-20
Which versions are affected by CVE-2019-1721?
It affects 1 product.
Products include Cisco Telepresence Video Communication Server.
How do I fix CVE-2019-1721?
No fix has been published for CVE-2019-1721 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-2019-1721 being exploited?
There is no known exploitation of CVE-2019-1721 in the wild and no public exploit code.
Other vulnerabilities in Cisco TelePresence Video Communication Server (VCS)
- CVE-2023-20105 Privilege escalation in Cisco TelePresence Video Communication Server (VCS) Expressway
- CVE-2023-20192 Cisco Expressway Series and Cisco TelePresence Video Communication Server Privilege Escalation Vulnerabilities
- CVE-2022-20754 Cisco Expressway Series and Cisco TelePresence Video Communication Server Vulnerabilities
- CVE-2022-20755 Cisco Expressway Series and Cisco TelePresence Video Communication Server Vulnerabilities
- CVE-2016-1468 Command injection in n/a
Sources
Also known as GHSA-7qgm-86vq-4g8p.