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CVE Record

CVE-2018-11518: A vulnerability allows a phreaking attack on HCL legacy IVR systems that do not use VoIP.

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).

UnknownCVSS not scoredNot KEV-listedUpdated
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Glexia's TakeAutomated analysis

Security readout for executives and security teams

This CVE describes a weakness in legacy HCL IVR phone systems that process services using predictable phone-tone sequences. If the system cannot confirm the caller intended an activation, audio in the caller's environment could trigger an unwanted request. Business risk is mainly unauthorized service activation or telephony abuse, but product scope and severity data are incomplete. Exposure appears limited to organizations operating affected HCL legacy IVR systems that do not use VoIP and still allow service activation through predictable audio-tone sequences. The source bundle does not provide CPEs, versions, CVSS, or a complete affected product list. Treat this as targeted operational risk rather than broad internet-scale urgency. Prioritize review if legacy IVR systems can activate paid, privileged, or customer-impacting services by phone tones. The missing severity and affected-version data lower confidence, not necessarily risk. Mitigation focus: Inventory legacy HCL non-VoIP IVR systems and service-activation flows.; Check HCL or vendor guidance for supported fixes or configuration changes.; Require caller-specific challenge or nonce confirmation where supported..

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Generated from the cited source records. This long-tail analysis has not been individually reviewed by a named human.

Potential ATT&CK relevance

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Vulnerability profileCVE Program record
Severity
Unknown
CVSS
Not scored
Known Exploited
No
Published
Official CVE source material

CNA and ADP enrichment extracted from CVE v5

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0CVSS vectors
0Timeline events
0ADP providers
4Source links

CVSS and timeline data

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Source materials

Affected products

Products and packages named in the record

VendorProductVersion / packageStatus
n/an/an/aListed
Weakness

CWE details

No CWE listed

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