What’s Vulnerable › Vulnerabilities

CVE-2019-1720: Cisco Expressway Series and Cisco TelePresence Video Communication Server Denial of Service Vulnerability

• Severity: medium (CVSS 4.9 v3.0)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 1.7% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2019-04-18 · updated 2026-06-17
• Weakness: CWE-20

Description

A vulnerability in the XML API 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 specifically crafted XML payload. A successful exploit could allow the attacker to exhaust CPU resources, resulting in a DoS condition until the system is manually rebooted. Software versions prior to X12.5.1 are affected.

Affected products

• Cisco TelePresence Video Communication Server (VCS) Expressway: before x12.5.1 — fixed in x12.5.1

How to fix

Upgrade to a fixed version: Cisco TelePresence Video Communication Server (VCS) Expressway x12.5.1. Check the vendor advisory for mitigations.

References

• http://www.securityfocus.com/bid/108002
• https://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-20190417-ces-tvcs-dos
• http://www.securityfocus.com/bid/108002
• https://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-20190417-ces-tvcs-dos

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