CVE-2019-1720 : What You Need to Know

Cisco Expressway Series and Cisco TelePresence Video Communication Server (VCS) have a vulnerability in their XML API that could lead to a denial of service (DoS) attack.

Understanding CVE-2019-1720

This CVE involves a security issue in the XML API of Cisco Expressway Series and Cisco TelePresence Video Communication Server (VCS) that could allow a remote attacker to cause a DoS situation by exploiting CPU resources.

What is CVE-2019-1720?

The vulnerability arises from inadequate processing of XML input, enabling an attacker with valid credentials to send a modified XML payload, leading to 100% CPU usage and a DoS scenario.

The Impact of CVE-2019-1720

CVSS Base Score: 6.8 (Medium Severity)
Attack Vector: Network
Availability Impact: High
Successful exploitation can exhaust CPU resources, necessitating manual reboot to resolve the DoS condition.

Technical Details of CVE-2019-1720

This section provides detailed technical insights into the vulnerability.

Vulnerability Description

The vulnerability allows a remote attacker to trigger a DoS attack by manipulating XML input.

Affected Systems and Versions

Affected Product: Cisco TelePresence Video Communication Server (VCS)
Vendor: Cisco
Versions Affected: Software versions earlier than X12.5.1

Exploitation Mechanism

Attacker needs valid credentials to send a specifically modified XML payload.

Mitigation and Prevention

Protect your systems from CVE-2019-1720 with these mitigation strategies.

Immediate Steps to Take

Apply vendor-released patches promptly.
Monitor network traffic for any suspicious XML payloads.
Restrict network access to vulnerable systems.

Long-Term Security Practices

Regularly update software to the latest versions.
Conduct security training for staff on identifying and responding to potential threats.

Patching and Updates

Stay informed about security advisories from Cisco and apply patches as soon as they are available.