CVE-2018-11518: Hcltech Legacy Ivr Firmware

High severity, CVSS 8.1. EPSS: 1.4% chance of exploitation in the next 30 days.

A vulnerability allows a phreaking attack on HCL legacy IVR systems that do not use VoIP. These IVR systems rely on various frequencies of audio signals; based on the frequency, certain commands and functions are processed. Since these frequencies are accepted within a phone call, an attacker can record these frequencies and use them for service activations. This is a request-forgery issue when the required series of DTMF signals for a service activation is predictable (e.g., the IVR system does not speak a nonce to the caller). In this case, the IVR system accepts an activation request from a less-secure channel (any loudspeaker in the caller's physical environment) without verifying that the request was intended (it matches a nonce sent over a more-secure channel to the caller's earpiece).

Affected products

• Hcltech Legacy Ivr Firmware: affected versions not specified

Published 2018-05-30. Last modified 2026-06-17.